GIS&RS
mojtaba poorrahimi; Meysam Argany
Abstract
One of the most important consequences of the rapid growth of urbanization and the physical development of the country's cities in the past decades is the breakdown of the distribution system of urban service centers, which has become the basis for social inequality of citizens and the level of enjoyment ...
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One of the most important consequences of the rapid growth of urbanization and the physical development of the country's cities in the past decades is the breakdown of the distribution system of urban service centers, which has become the basis for social inequality of citizens and the level of enjoyment of urban services. In the meantime, medical services are of particular importance, so that the weakness and inefficiency of the management in the matter of providing optimal services in this field will have extensive negative consequences. In this research, we investigated the access of the population to the hospital as an integral part of a social organization that is responsible for providing complete health care including treatment and prevention measures in the population as an important measure in the health of the city in smartness. we paid In the current research, using the 2-step method of the floating basin, using network analysis and pre-processing of population blocks, to prevent the inflation of supply and demand, we have created the access limits of the population to the hospital. The results show that according to the growth of the urban population and the direction of these changes in each studied urban area, the population's access to the hospital is poor and limited population blocks have appropriate access, inappropriate distribution and dispersion in the location of hospitals and lack of planning regarding Increasing the approved beds and activating the beds are the things that cause the lack of easy and quick access to these services for the population of southern areas of Tehran.
GIS&RS
Mansoureh Sadrykia; Neda Kazemipour
Abstract
Land subsidence is an environmental phenomenon of the gradual or sudden subsidence of the land. The purpose of the present study is to evaluate the land subsidence in Shabestar plain of East Azerbaijan province. Using Small Baseline Subset (SBAS) time series analysis method, the crust surface displacement ...
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Land subsidence is an environmental phenomenon of the gradual or sudden subsidence of the land. The purpose of the present study is to evaluate the land subsidence in Shabestar plain of East Azerbaijan province. Using Small Baseline Subset (SBAS) time series analysis method, the crust surface displacement rate between 2018 and 2021 is investigated. The maximum subsidence is seen in the southern and southeastern parts of the plain with a maximum rate of about 8 cm per year in the direction of the satellite line of sight. Also, using AHP the conditioning factors are weighted and the land subsidence susceptibility (LSS) is modeled using spatial analyses. Thereupon, Shabstar plain was classified into five regions with the LSS: "Very High": 3%, "High": 20%, "Moderate": 25%, "Low": 33% and "Very Low": 19% of the total area of the plain. To verify the accuracy of the subsidence susceptibility model, the displacement map obtained from radar interferometry was utilized, the area under the ROC curve of 86% confirmed the good prediction accuracy of the model. Also, the model was assessed by performing sensitivity analysis for most important conditioning factors. The introduced model can provide useful and reliable information for managers and decision-makers of the region for the effective and timely 'prevention' and 'mitigation' planning with low cost and time.
GIS&RS
Anahita Omidi; Meysam Argany; Sahar Daraee
Abstract
Covid 19, also known as coronavirus, is an infectious disease caused by the SARS-CoV-2 virus. Anyone can get Covid 19 at any age and become seriously ill or even die. In the meantime, vaccines have saved millions of lives. Covid vaccines are effective for most people 18 years of age and older with autoimmune ...
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Covid 19, also known as coronavirus, is an infectious disease caused by the SARS-CoV-2 virus. Anyone can get Covid 19 at any age and become seriously ill or even die. In the meantime, vaccines have saved millions of lives. Covid vaccines are effective for most people 18 years of age and older with autoimmune disorders or underlying diseases. The recommender systems are an intelligent complement to the retrieval of information and refining concepts by analyzing user behaviors and one of the main tools in overcoming the problem of information redundancy. Therefore, in the process of vaccination centers recommending, uncertainty in preferences can be modeled and personalized recommendations can be performed. Therefore, by using the information of users' preferences and properties of vaccination centers based on knowledge-based recommender systems, appropriate arguments can be made about which centers are suitable for users.
GIS&RS
maryam Ebrahimian najafabadi; Alireza Ildoromi; samar mortazavi; Ebrahim Mohammadi Manesh
Abstract
Today, one of the most important environmental problems around the world, especially in aquatic ecosystems, is heavy metals pollution. since sediments are the main source of heavy metals, in this study, Gamasiab River sediments were evaluated for heavy metal contamination of chromium, copper, nickel, ...
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Today, one of the most important environmental problems around the world, especially in aquatic ecosystems, is heavy metals pollution. since sediments are the main source of heavy metals, in this study, Gamasiab River sediments were evaluated for heavy metal contamination of chromium, copper, nickel, zinc, iron and manganese. After layering, the results were interpolated by two methods of kriging and Inverse Distance. Moller Index, Ecological risk Index and numerical parameters were used to assess the range of sediment pollution. Results of Moller index in spring showed no pollution. Also, in summer it represented no pollution for all metals except Ni. Results of RI categorized level of Heavy metal concentration in low contamination. Using RI plans, zoning plans and Hot Spot analysis indicated that the concentration of heavy metals in the east of Gamasiab river in spring is higher than summer and it is shown that spots with high concentration in summer are located in the west of Gamasiab river.
GIS&RS
Akbar Asghari Zamani; Khalil Valizadeh Kamran; Robab Rahmani
Abstract
IntroductionVarious physical, semantic and functional factors in the role of the city as a bed to meet the needs and a container for the activities and behaviors of residents are effective, among which the structure and visual values of the environment play an important role in improving the quality ...
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IntroductionVarious physical, semantic and functional factors in the role of the city as a bed to meet the needs and a container for the activities and behaviors of residents are effective, among which the structure and visual values of the environment play an important role in improving the quality of urban space (Hosseini and Et al., 1390: 84). Among these, one of the urban elements that can play an important role in promoting the quality and visual values of the environment and the appearance of the city is the sky line. The skyline is one of the most influential factors in arranging urban spaces and planning appropriate urban environments, etc. A factor that is rarely seen in metropolitan areas today. It seems that in order to have a diverse and at the same time harmonious urban skyline, in the first place, it is necessary to reconnect the fields of philosophy, art and daily life, which are free from the abstract and abstract view of experts. The development of interdisciplinary professions such as GIS, architecture and urban design is one of the measures in this direction that can have a different and more accurate view of the urban skyline. Therefore, the need for advanced geographical models for spatial three-dimensionalization and decision-making and forecasting goals in urban planning and design, especially in the case of vertical evaluation and development, is very clear and necessary. The advantages of using three-dimensional GIS models can be high potential in urban evaluation and analysis in various dimensions of urban aesthetics and high technology in the field of spatial analysis, the ability to test urban proposals and the power of semantic and topological storage. Mentioned above. Therefore, the use of these softwares to analyze urban issues is very important and increases the accuracy of urban planners and managers. For this purpose, the present study seeks to investigate the status of the urban skyline in the study areas and based on this, the importance of the perceptual and managerial dimension of the issue is analyzed using new methods and techniques.Data and Method The analytical approach of the research is physical and the method used in this research is three-dimensional vision analysis. Also, Arc GIS software has been used for easy preparation of the environment in 3D to perform the required analyzes. The data set used includes: digital model data of elevation, surface and floor layers of urban blocks.Results and Discussion In the present study, the concept of skyline was analyzed using three-dimensional GIS analysis in areas of urban areas 1 and 5 located in the east and northeast of Tabriz. Areas of interest include Valiasr town and Rushdieh town. So far, many different methods have been proposed to display and analyze the skyline. Some of these methods were reviewed in the research background and their strengths and weaknesses were identified. But the purpose of this article was to investigate the capabilities of 3D analysis and modeling through the development of 3D GIS in skyline display and analysis. Evaluating the results obtained in this research and comparing it with the results of studies in this field shows that three-dimensional analysis of GIS and 3D GIS development in comparison with other methods, provided there is accurate and comprehensive information, has high efficiency and capability. The research hypothesis is confirmed.ConclusionThe skyline is important both in terms of urban architecture and in terms of urban planners and designers; Although these specialties are different in terms of information extraction methods, methods and analytical contexts, but they are quite similar in terms of results. In general, it can be said that the skyline is one of the analyzes that are analyzed and evaluated in different software environments such as Arc GIS and in different fields.But the results of this study proved in another way that the three-dimensional GIS environment provides an opportunity to easily view and analyze the level of impact, effectiveness, volume, dimensions and angles of the skyline; This software also has high analytical power. While the analysis of the sky line in a two-dimensional environment gives a graphical and dimensionless result, percentage and frequency. But the most important difference and the ability to use 3D GIS analysis is that it provides a platform where even people with little knowledge of urban views can easily see the results and make decisions based on it. Also, the capabilities and capabilities of GIS in the field of various valuations and combined analyzes of vector and raster functions, as well as the presentation of three-dimensional analysis, have led its applications to urban design.
GIS&RS
Leila Dehghani Firoozabadi; Alireza Ildoromi; Mir Mehrdad Mirsanjari; sahar abedian
Abstract
IntroductionToday, tourism is considered as one of the most important activities in the world, and it has high potential in generating foreign currency incomes and creating jobs. According to the definition, ecotourism is a responsibly journey to natural areas that protect the environment and improve ...
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IntroductionToday, tourism is considered as one of the most important activities in the world, and it has high potential in generating foreign currency incomes and creating jobs. According to the definition, ecotourism is a responsibly journey to natural areas that protect the environment and improve the lives of local people. Despite having the necessary potential in tourism in Iran, it has not succeeded in attracting tourists. The first step towards achieving tourism development in the country is identifying, assessing, and introducing the existent potentials and capabilities to provide development opportunities with comprehensive knowledge and planning. Dorud is one of the unparalleled regions in Lorestan province due to the availability of sufficient water resources that can be a good place for water resource recreation. Unfortunately, despite these tourist attractions, there has not yet been an organized approach to land use planning that takes into account these natural talents of the region for water tourism. According to the mentioned issues, the present study intends to use a multi-criteria evaluation to identify and zonate suitable areas of water tourism, and its purpose is to properly plan the tourism with environmental considerations and prioritize these areas in the Dorud city.Materials and methodsDorud is situated in Lorestan Province. It is located between latitudes 33°16'-33°44'N and longitudes 48°47'-49°19'. In this study, by investigating the factors influencing the zoning of tourism-prone areas, Dorud region has been zoned based on multi-criteria evaluation model. Multi-criteria evaluation is a structured process for defining goals, formulating criteria, evaluating, and solving decision problems. In this study, the criteria was detemined based on the criteria of the ecotourism national document, the criteria of the ecological potential assessment, and the ecotourism criteria in the protected areas. After the preparation of the criteria maps, it is necessary to standardize the maps that have different ranges and scales. In this research, Fuzzy and Boolean methods were used to standard the scales. In order to fuzzy the criteria maps, the pixels are ranked based on the membership degree in the fuzzy range from 0 to 255, and high degree of membership indicate more desirability of pixels for tourism. In the Boolean method, zero values are inappropriate areas, and values of one indicate suitable areas for development. In order to weigh the criteria, the pairwise comparison method was used in the form of analytical hierarchy process (AHP), and then the maps were combined using the weighted linear combination method. Then, in order to prepare the final suitable map, it is necessary to extract the zones, which have 70% suitability and have more than 5 hectares. Finally, suitable zones for recreation prioritized by TOPSIS model.Result and discussionIn this research, the effective environmental criteria were considered as informational layers in water recreation zoning. Criteria were taken with two views: one for water recreation in lotic water resources, and the other on flowing water resources. The effective environmental criteria in water recreation zoning classified in 5 criterion groups involved physical, ecological, fundamental, safety, and social-economic and 27 sub criterion for water recreation in Lotic water resources, and 26 sub criterion for water recreation in lentic water resources. At this step, due to the difference in the type of tourism recreation in lotic and flowing water resources, two types of utility maps for the flowing water resources (waterfall and rivers) and the latic water recources (mineral fountain, dam, water reservoirs, sarab, lakes and wetlands) were prepared. Then, in order to zoning the area, the final raster layer was classified into four categories based on the suitability of the land. Thus, the first categort with high potential (the suitability of more than 150), the second category with the average potential (the suitability of 110 to 150), the third category with the weak potential (the suitability of 50 to 110), and the forth category without suitability (0 to 50) were considered. In the next step, the first category was considered as the best class for the water recreation, and extracted from the suitable map. Based on the performed classification, 8.47% of the area has high potential for recreation in flowing water resources, and 10.28% of the area has high potential for recreation in latic water resources. Finally, six suitable zones in each of the recreations were selected, and tourism zones were prioritized according to the TOPSIS method.ConclusionThe results of criteria weighting for latic water resources showed that distance from lake, wetland, sarab, dam and water reservoirs are the most important criteria in suitable recreation areas. In addition, the results of the combination of AHP and TOPSIS in water resources showed that the slope and depth with a weight of 0.182 and, 0.173, respectively are the most important indicators in this model, respectively. Consequently, results showed that Merok dam, Mahi hamyane Sarab and pond, Heshamatabad 2 pond zones respectively have highest preferences for water recreation in lotic water resources. In relation to the tourism recreation in flowing water resources, weighting criteria shows that distance from the river, slope and height are the most important. In addition, the results of the AHP and TOPSIS combination in flowing water resources show that the slope, water speed, and water volume with a weight of 0.191, 0.171, and 0.140 are three important indicators in this model, respectively. As a result, Sezar River, Gaharrood 1 and Gaharrood 2 have highest preferences for water recreation flowing water resources. The proposed zones in this research were determined based on ecological and socio-economic criteria that indicate the high capability of the zones for this type of recreation. Of course, in order to implement tourism goals, further studies are needed in areas such as determining the ecological capacity of the region, soil erodibility and so on.
GIS&RS
Azra Masumei; Bakhtiar Feizizadeh; Khalil Valizadeh Kamran
Abstract
IntroductionPublic art has followed a new trend in urban spaces in recent years, so that cities invest highly in the design and implementing of public works of art and improving the visual quality of urban spaces, since it is effective in creating good urban spaces and making the city attractive and ...
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IntroductionPublic art has followed a new trend in urban spaces in recent years, so that cities invest highly in the design and implementing of public works of art and improving the visual quality of urban spaces, since it is effective in creating good urban spaces and making the city attractive and memorable. It also encourages people to communicate with works of art and each other. Although public art as an art integrated with the public space of cities is not a new concept, many changes have been created in public art and it caused the creation of various types of public art in most cases from a purely static art to a dynamic and interactive art. This article aims to investigate the effect of public art in urban spaces on promoting the perceived vitality of young people. Despite the importance and role of public art in the quality of urban public spaces, studies conducted in the area of public art have not paid much attention to the effect of different types of public arts in public spaces on vitality of people, especially young people. Thus, this study was conducted with the aim of answering the question of “which type of public art has a greater impact on promoting the perceived vitality of young people in urban spaces?”Data and MethodsThe present study is a qualitative-quantitative (mixed) study conducted as a survey. In the present study, visual approach and image reading were used to collect information. Visual research is a term that includes methods based on data collection and analysis of them through designing, painting, photography, film, or video images. In this article, public arts and interactive arts were divided into different types based on theoretical foundations and research literature and an image was selected from each type of art and through an online questionnaire was submitted to the participants and they were asked to express their level of vitality from watching that work of art in urban spaces on a 5-point Likert scales. This questionnaire was designed and sent to the target population through cyberspace applications. Since the target population of the present article was young people, the sample was selected among the students of Tabriz University and the students of Nabi Akram Institute of Higher Education in Tabriz in the second semester of 2020-2021. To determine the sample size, Cochran's formula with an error level of 5% was used. According to the number of students in these two universities (27000 people), the sample size of 379 was selected. After sending the questionnaire to nearly 380 people, 144 people completed the questionnaire. In this research, both art and architecture students and non-art and architecture students in both bachelor and master levels were surveyed.Discussion and ConclusionThe research results revealed that among different types of public arts in urban spaces, sound and digital arts such as musical fountain, and the integrated art embedded in the elements available in space such as wall relief in the body of the building and the art appropriate to the site, such as plants formed in parks, regardless of the three criteria of gender, age, education and field of study, are accepted by all young people and increase vitality, but abstract static art is less welcomed by young people. Among the interactive arts, dynamic-passive interactive art and static interactive art obtained the highest score in terms of creating a sense of vitality among young people, and in contrast, dynamic-dynamic interactive art obtained the lowest score. Art related to public and local culture caused the highest vitality among male young people and young non-art and architecture master students, and digital art caused the highest vitality among females and bachelor art and architecture students. In addition, among non-art and architecture bachelor students, two-dimensional applied art obtained a relatively high score.Results The results show that creating static works of art is not effective in designing cities and using public art to create a sense of vitality in urban space and young people show higher tendency to dynamic work of arts. Also, interactive works of art are more acceptable than non-interactive types, and urban planners should pay attention to this issue in embedding works of art in urban spaces and take right decisions and actions to increase presence, interaction, and vitality among young people in urban spaces. Also, the use of modern technologies and creativity in the artistic design of cities is one of the requirements for adapting the urban space to spirits of young people.
GIS&RS
keramatollah ziari; hossein iraji
Abstract
Introduction As the center of the province of Fars, the City of Shiraz experienced an endogenic and organic growth until the 1960s and prior to the onset of modernity in Iran, which saw a good balance between the urban population growth rate and its area growth. Following a rise in the urban population ...
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Introduction As the center of the province of Fars, the City of Shiraz experienced an endogenic and organic growth until the 1960s and prior to the onset of modernity in Iran, which saw a good balance between the urban population growth rate and its area growth. Following a rise in the urban population in recent decades, the physical form of the cites also changed.Data and Method To investigate the changes and dynamism of the land cover, land use maps were developed to determine the changes over different time intervals. The maps were derived from Landsat satellite images with OLI, TM and Mss sensors in 1984 and 1994 as well as in 2014 and 2020 by using Remote Sensing techniques on the Earth Explorer Site. TerrSet software was also used to analyze the images. To analyze satellite images, it is required to use TerrSet software.Discussion and conclusionConsistent with regression model analysis, land use changes into urban territories have, over the past 40 years, involved 60% of the total area of the city of Shiraz, indicating sharp change trends in this time interval. The orientation of the changes has mainly been north to south of the city which is due to the proportionate developmental space and presence of open plains.Results Data analysis suggests that land use changes as well as their analysis in the Markov’s model are experiencing a disproportionate expansion under the effect of unsystematic and irregular urban growth. This study determines that districts 9, 10 and 6 saw an irregular (spiral) urban growth in 2018.
GIS&RS
Najma Esmailpoor; fatemah esmaeilpoor; mojtaba yami; hosein amirazodi
Abstract
Introduction
The phenomenon of Thermal Island as one of the urban hazards is the result of the way of activity and physical development of cities as well as extensive changes in the land use pattern around cities. The surface temperature of the earth is not only affected by the amount of energy received ...
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Introduction
The phenomenon of Thermal Island as one of the urban hazards is the result of the way of activity and physical development of cities as well as extensive changes in the land use pattern around cities. The surface temperature of the earth is not only affected by the amount of energy received by the sun, but also by the environmental conditions of the place, especially the reduction of suburban arable land, vegetation degradation and increasing impermeability levels and potentially prone to heat production and pollution. Heated island is a term used to describe the warmer atmosphere and higher temperatures of cities compared to non-urban areas. Determining the geographical distribution and nature of UHI, as well as the factors influencing its occurrence or severity, is something that is now efficient, fast, and inexpensive using satellite imagery and remote sensing techniques. Ahvaz is one of the metropolises with ethnic diversity and mixed subcultures that has experienced a large and rapid increase in population and area over the last three decades and the city has expanded in different directions from south to southwest and north to northeast Has found. One of the prominent consequences of this issue is the emergence and strengthening of the Heated island in this city.
Data and Method
To determine the spatial-place changes of the heated islands of Ahvaz and also to determine its relationship with land use changes, first the Landsat satellite TM sensor images in the last 30 days and Envi software were used and the following main steps were performed:
Stage 1 - Preparation of thermal map of the city: To calculate the temperature of the single channel algorithm (SCA) in order to extract LST, an extended infrared thermal band was used and to calculate it, Equation 1 was used.
Ts = γ {𝜀1- (YLsensor + Ψ2) + Ψ3} + δ
Here are five essential steps you can take to begin the process of preparation for mediation.
To calculate each of the parameters in the equation below 5 consecutive steps as described in the headings
The first step is to calculate the spectral radius
The second step is to calculate the light temperature of the sensor
The third step is to calculate the radiative power
Step 4, calculate the values of γ and δ
Step 5, calculate atmospheric parameters
Stage 2: Prepare a land use map using the decision tree: The function of the model is a branch that consists of three levels of decision making and finally to determine the six layers of land cover (including agricultural land, rangeland, irrigated land, heights (Topography), land with little vegetation and built-up lands.
In the model run, after applying the preprocessors to the Landsat images, the corresponding images were created for classification using NDVI, DEM, NDWI and LST indices. Setting a threshold for the NDNI index (NDVI> 0.26) vegetation is isolated from other data. In the correct branch, the next node was isolated using NDWI index (NDWI≤0.0) and determination of rangeland class threshold, agricultural land and water. In the third decision-making branch, based on the thresholds defined in the image indices (DEM≥40), DEM topography was determined, Were introduced.
Results and Discussion
Statistical study of the trend of change in land surface temperature and construction index and the ratio of change of other carabis to urban land uses showed that the trend of change is the average construction of the ascending course and the average temperature of the ascending course and the trend of changes with the transformation process With the expansion of the city of Ahvaz, their vegetation and land have been destroyed and turned into urban lands, and now the thermal island has been directed from the inside of the city to the outskirts. The temperature increase ratio of the urban area was higher than the whole study area.
Conclusion
Based on the results, the temperature of Ahvaz city increased from 282.96 degrees to 287.02 degrees Kelvin between 1988, which shows a growth of 2% and an increase of 4 degrees. Spatially, the highest temperature increase in the city is related to the east and southeast of the city, where agricultural lands and lands with little vegetation have been converted to industrial town and industrial uses and become a source of heat production in this metropolis. Has been. Also in the western part of the city, due to the further expansion of the city and the implementation of residential preparation projects - the NDBI index confirms the same - there has been an increase in temperature. Other influential factors in the spatial change of temperature in these parts of Ahvaz city are the existence of main roads such as Ahvaz-Abadan highway (southern part of the city), Ahvaz-Bandar Imam Khomeini highway (eastern part). Due to the asphalt cover of these routes and more vehicle traffic, they have caused an increase in the thermal map of the region.
The lowest temperature in 2020 is related to the areas around the Karun River. Among the factors that have caused the low temperature in this place compared to other parts of Ahvaz in 2020, we can see the existence of the government park, Shahid Chamran University with a lot of green space and low-density residential texture and more open and green space than they mentioned other parts of the city as well as the wetlands of the last two years.
Analysis of the trend of UHI changes and increase in construction using Landsat time series images showed an increase in urban temperature compared to the surrounding area in 1988. This shift in 2020 was due to an increase in regional temperature compared to the city due to river flooding. , Increase in construction and industrial activities in and around the city.
Due to the environmental dangers of the Heated island, which directly and indirectly affect urban air pollution, greenhouse gas emissions and global warming, disrupt thermal comfort, increase water and electricity consumption, and exacerbate diseases such as asthma They leave, It is necessary to prevent the change of agricultural use to urban areas, and within the city, between dense textures and industrial areas, by creating vegetation in the form of parks and gardens, tried to prevent the rise in surface temperature.
GIS&RS
Firouz Jafari; Fatemeh Movahed
Abstract
INTRODUCTIONExtraction and processing of various features with the help of aerial imagery reduces the time and financial costs associated with the use of ground mapping and the resulting human error. Advances in the field of aerial sensors in terms of spatial and spectral resolution with precise place ...
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INTRODUCTIONExtraction and processing of various features with the help of aerial imagery reduces the time and financial costs associated with the use of ground mapping and the resulting human error. Advances in the field of aerial sensors in terms of spatial and spectral resolution with precise place and performance picking up altitude from the ground have led to the use of each part of information about terrestrial phenomena such as spectral and spatial characteristics Brought. Today, complementary data used to detect complications are Lidar data, the sensor of which is sent and received, and the electromagnetic spectrum in the near-infrared spectrum (in its aerial form) and joined the spectrum. Pays close infrared and green band (in space type). DATA AND METHODSLidar data and spectral images were analyzed using different types of algorithms effective in landfill extraction to assess density. New layers of images were obtained in the form of raster from the study area, which was analyzed by performing slope extraction steps on flat and sloping surfaces. Buildings that were definitely not buildings were removed. The size and spectral characteristics of the missing structures were identified and the parcels were redistributed to extract the impermeable surfaces. Which led to the achievement of two levels of parcels and impenetrable points. The data set is related to the northern part of Bandar Anzali, which includes a vertical aerial photograph, irregular cloud points of the region with dense one to two points per square meter with an average point space of 0.69 square meters, and vertical aerial photograph with spatial resolution. It is 8 cm square. RESULTS AND DISCUSSIONIn this study, a different method for extracting buildings using airborne Lidar data and ultracam images was presented. The proposed system used geometric and spatial information of Lidar data and ultracam images, which included three general steps, in the first step; Lidar data were filtered and extracted using spectral clustering of buildings. In the second step; The obtained model was compared with the two-dimensional boundaries of buildings by the height threshold method. In the third step; After extraction, the first building boundaries were merged with the structures extracted by the checker algorithm. In the stage of separating terrestrial from non-terrestrial points, all points related to land were classified and extracted. The remaining points were classified as roof points, which were dealt with in the fault section of the buildings. All the functions used enabled the system to successfully extract the structures from the Lidar data. CONCLUSIONThe data for the first return points were subtracted from the data for the last return points and a fixed value was obtained which depended on the altitude accuracy of the difference between the two returns. In addition to the mentioned method, the clustering method was used during the research that each cluster belonged to a roof section so that the characteristics of each surface model could be easily determined.Then, to complete the shape of the roof, the footprint of the building that was extracted was used. In fact, the borderlines and inner vertices extracted only part of the shape of the border. Other sections, such as vertical edges, were not detected due to intersection. This is due to the lack of front sampling. Finally, the items extracted through spectral clustering in eCoginition software and two-dimensional boundaries extracted from ENVI Lidar software, to increase the accuracy of land surface extraction (buildings) and make the area of buildings studied in this data Were merged. As mentioned; After extraction, the primary building boundaries were merged with the structures extracted by the checker algorithm. In the section of buildings diagnostics, buildings with errors were discussed and the evaluation of the results showed that the system used has relatively reached the set goals and the methods used include the threshold method. Elevation, clustering, spectral method, and integration method were evaluated for each of the four blocks with error rates of 28%, 15%, and 0%, respectively, based on the area of extracted tolls to the study area. The error of each building was first examined in general and then in detail, and it was found that aerial Lidar technology has an extraordinary ability to collect very right and dense samples of altitude measurements of cities and a new level of detail information can be Accurately extracted building density automatically and efficiently from aerial Lidar data. In 417 buildings that were surveyed and analyzed, the height of the buildings was achieved with high accuracy and all the buildings in the study area were extracted with a compact and organic density as well as scattered and planned.
Geomorphology
Shabnam Mahmoudi; Davod Mokhtari; Mohamad Hossein Rezai moghadam; Abbas Moradi
Abstract
Introduction Erosion involves the retreat or advancement of the coastline, is the one of the recent problems of communities along the coast and the existing infrastructure located near the estuary system. Environmentally, coastal areas are of great importance and value due to their sensitive and productive ...
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Introduction Erosion involves the retreat or advancement of the coastline, is the one of the recent problems of communities along the coast and the existing infrastructure located near the estuary system. Environmentally, coastal areas are of great importance and value due to their sensitive and productive ecosystems. Short-term or long-term coastline changes are important in the situation and geometry of coastlines and coastal management. Awareness of coastline behavior helps to manage beaches when designing and constructing coastal facilities and determining the safe margin of the coast. This article tries to modeling the changes in the coastline of East and West Bandar jask(southern Iran) in a timespan, a step towards coastal management for the planning and operation of facilities of Jask Port, which can be follow the future development of the area. Methodology The study area is part of the coast of Jask city located in Jask county in southern Iran. For this purpose, the extent of coastline changes to determine the boundary line between land and water was examined. To be more precise, spectral operators were used in the Arc map environment and Landsat satellite imagery; the next step was to polygonize the shoreline according to the fixed landline on land. In addition, Google Earth satellite imagery was used to examine and mark some case-by-case changes, such as cape changes in the western part of the port of Jask and so on. Results and Discussion The dynamics of coastlines and their variability (affected by lithology and wave activity), the shape of coastlines and their effect on erosion and location of coastal sediments, resources and location of sediment accumulation and hydrodynamics of areas close to coastlines, the intensity of seasonal winds and its role in transmission Sediment transfer and erosion mechanisms, and ultimately, human activities, are among the factors influencing coastline changes. The shape of the shores was examined using the Hausdorff-Pesikovtch method. Accordingly, the rate of change in the area of polygons on the east coast (progress) is higher than on the west coast (retrograde). The reason for the progress on the East Coast could be the construction of new piers, tidal performance, the shape of the beach and how it is positioned against the waves. Overall, Oman's beaches are uplifted, which could be the reason for the retrograde; however, the drying up of the coast in order to build piers and breakwaters has led to the advance of the coast. conclusion Prove the existence of progress on the east coast due to the construction of three new piers (after 2006) and the presence of retrograde on the west coast due to the existing natural mechanisms of the region such as the uplift of Oman coast, is the most important finding of this study. The shape of the beach and the way it escapes from the waves due to the prevailing wind direction (from the southeast) on the east coast has intensified the effect of the human factor.
GIS&RS
fakhry sadat fateminiya; behrouz sobhani; Seyed Abolfazl Masoodian
Volume 23, Issue 69 , December 2019, , Pages 213-231
Abstract
Satellite images as new tools, provide new dimensions for land monitoring. In this study, in order to determine the homogeneous geographical areas in terms of leaf area, the remote sensing images of the Terra-Aqua Modis during the period of 2002-2016 with a spatial resolution of one kilometer and 8 days’ ...
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Satellite images as new tools, provide new dimensions for land monitoring. In this study, in order to determine the homogeneous geographical areas in terms of leaf area, the remote sensing images of the Terra-Aqua Modis during the period of 2002-2016 with a spatial resolution of one kilometer and 8 days’ time interval used.Leaf area was Zoning and analysis using the Matlab software and the Google Earth database. For this purpose, first, the mosaic and determination of the territory of Iran in the satellite data set of the Modis was determined. Then, a database in the field of cluster analysis, choropleth zoning created. Long-term mean temperature and precipitation data were also used in order to better understand the range of the leaf area. According to this analysis, 39.9 percent of Iran's vast vegetation is governed. The four zones identified in the country are the large, massive, moderate, and narrow areas. These four domains are respectively 0.89, 0.001, 3.31, and 35.76 of the land. The results showed that in all studied areas, the leaf area had a higher percentage during The warm period of the year due to the high temperature in this period and the presence of precipitation in the early cold season. The northern slopes of the Alborz, Hyrcanian forests, Golestan forests, Arasbaran forests are areas where there are different regions in all zones. In addition to forests, the areas identified for each generally include fields.
GIS&RS
bakhtiar feizizadeh; seyed mohammad hassanitabar; Jafar Jafarzadeh
Volume 22, Issue 65 , November 2018, , Pages 223-241
Abstract
Segmentation is one of the basic method of the information extraction within the object-based image analysis (OBIA) approach. This process separates initial and main objects which are basis for OBIA. According to this, generating appropriate segments plays an important role for performing high accurate ...
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Segmentation is one of the basic method of the information extraction within the object-based image analysis (OBIA) approach. This process separates initial and main objects which are basis for OBIA. According to this, generating appropriate segments plays an important role for performing high accurate object-based classification. Within this research, we aimed to employ multi spectral and spatial satellite images including: IRS, Quick Bird and Spot5, for the purpose of image fusion and optimizing the scale of segmentation. For this to happen, Multi-resolution segmentation approach was performed based on various satellite images with different spatial resolution. As that, spatial information of Quick Bird and panchromatic band of IRS and Spot5 images, alongside spectral resolution of Spot5 (red band, especially) and Quick Bird, have a significant impact in increasing the contrast of image and improve the quality of segmentation, subsequently. The results of this research, indicate the importance of applying spatial information for optimizing the scale of segmentation. In addition, results confirmed that object based image fusion techniques can be employed for integrating different spatial resolution of satellite images. It also turned out that integrating lower spatial resolution with high spatial resolution is an efficient procedure for improving segmentation quality. The results of research, are great of importance for identifying different segmentation approach of object-based classification. The achieved results are also important for executive departments such as Natural resource, agriculture, etc. in light of presentation appropriate approach for rapid extraction of information from satellite image.
GIS&RS
Jafar Jafarzadeh; Hashem Rostamzadeh; Mohammadreza Nikjoo; Esmaeil Asadi
Abstract
The study of changes in water resources in each region is essential to manage water resources and using them. In this study, the goal is to evaluate the available water resources in the plain of Ardebil in terms of surface and subsurface resources based on four criteria including natural, hydrological, ...
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The study of changes in water resources in each region is essential to manage water resources and using them. In this study, the goal is to evaluate the available water resources in the plain of Ardebil in terms of surface and subsurface resources based on four criteria including natural, hydrological, agricultural and humanitarian by using fuzzy network analysis. In order to assess better fuzzy network analysis evaluation, sub-criteria of population, industry condition, rainfall situation, the status of surface water (volume taken from the river) and groundwater (wells, springs and aqueducts status), the area under cultivation and the type of products in terms of water demand, slope and elevation are used. Dependencies among sub-criteria using DEMATEL fuzzy technique and according to experts are determined. Using the fuzzy network analysis all criteria and sub- criteria are weighed, and the maps for all sub-criteria, are generated in according to the weight obtained. Finally, the result map that is based on initial layers and weighted based on the fuzzy techniques is generated in GIS. The resulting map is identified the sensitivity of the study area in terms of potential water resources. The study area (Ardebil plain) is located in the northwest of Iran and is delimited by latitudes 38°05′ N and 38° 30′N and longitudes 48°15′ E and 48° 35′E. The average height is about 1360 meters from the sea level. It covers an area of about 820 km2 and is part of Qara Soo river basin. The low risk areas 11.13 % equivalent to 9200 hectares are located on the northern and a bit in west of the plain. The average risk areas 19.36 % equivalent to 15870 hectares are located in the north and west of plain. The high risk areas 21.3 % equivalent to 17510 hectares are located mostly in the central and upper parts of the plain. The vulnerable risk areas 31.9 % equivalent to 26220 hectares are located in the southern and central parts of the plain and finally the critical areas 16.1 % equivalent to 13250 hectares are scattered mostly in the south and east of the study area.
GIS&RS
Asgar Zarabi; Rasoul Babanasab; Alireza Rahimichamchani; Jabar Alizadehasl
Abstract
Nowadays ICT (Information and Communication Technology) as a new dominant paradigm of development has become the focus of all the aspects of development and progress by influencing the way of thinking and acting and changing life and work patterns and in fact it is considered as both the reason and the ...
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Nowadays ICT (Information and Communication Technology) as a new dominant paradigm of development has become the focus of all the aspects of development and progress by influencing the way of thinking and acting and changing life and work patterns and in fact it is considered as both the reason and the sign of development. Due to the growing benefits of adopting this technology in order to achieve economic, social and political goals and sustainable development, following appropriate strategies and approaches for using ICT in our country is a must. Due to the fundamental and key role of ICT in achieving sustainable development and knowing that digital divide between regions has overshadowed the spatial and geographical justice and has provoked the uneven and unbalanced development of the regions of the country, any plan or program in developing ICT in the country should be based on the studying and understanding the current situation of ICT in the regions of the country and should be used to remove or eliminate the digital divide. In this research the development of the provinces of the country in terms of ICT was examined and these provinces were rated and ranked. In order to do so, we made use of 40 indicators and unique soft wares and models like GIS, SPSS, TOPSIS, scattering coefficient, weight rating technique, linear scale-up method, Pearson coefficient and so on. The findings of the study indicated that the provinces of the country are not in a good situation in terms of ICT and Tehran province as the first rank in terms of ICT was semi-developed. There are imbalances and disparities to some extent among the provinces of the country in terms of ICT development or in other words digital divide in such a way that Tehran province as the first rank was 2.5 times more developed than the last rank (Northern- Khorasan) and in general the first rank provinces were nearly twice times more developed than the fifth rank provinces. Also, ICT development correlated with population and especially with urban percentage; meaning that generally speaking, the most facilities and usages of ICT are focused in the provinces with more population and urban percentage. At last in order to eliminate or remove digital divide and balancing long-term development, the provinces of the country were ranked for achieving ICT development.
GIS&RS
Hadi Nayyeri; Kamal Khaleghpanah; Mohammadreza Karami; Khebat Ahmadi
Abstract
Earthquake is a serious threat for society development and its vulnerability is influenced by environmental variables. The damages of earthquakes are reduced by recognizing these variables and area zoning. The aim of this paper is the zoning of earthquake vulnerability of Sanadaj city based on effective ...
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Earthquake is a serious threat for society development and its vulnerability is influenced by environmental variables. The damages of earthquakes are reduced by recognizing these variables and area zoning. The aim of this paper is the zoning of earthquake vulnerability of Sanadaj city based on effective variables. For this purpose, the final map of region’s natural vulnerability zoning and skeletal indices and other effective social indices have been used. The variables were changed to layers of GIS and then, overlapping were performed using AHP and TOPSIS models. Finally, the vulnerability was classified in five groups from very low to very high. By comparing the results of these two models, it was revealed that these models had a similar vulnerability but they had a difference in which based on AHP model, the regions with very high vulnerability have little fragmentation in contrast with TOPSIS model. Therefore, according to AHP the most fragmentation was occurred in regions with low vulnerability. While, based on TOPSIS, the regions with average vulnerability have the most extension. According to Both models the most vulnerable areas were in the north of Sanandaj city.
