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Showing 12 results for Subject: Geography Information System

Mohammadreza Goodarzi, Maryam Sabaghzadeh, Amirreza Rajabpour Niknam,
Volume 0, Issue 0 (3-1921)

In arid and semi-arid, groundwater is more important for humans and ecosystems than surface water. Land subsidence is caused by the pumping and uncontrolled use of groundwater in an area. When harvested quantities aren’t compensated by rainfall, it causes damages such as road failures, destruction of residential areas, railways, and water and gas pipelines. Yazd-Ardakan plain is one of the important plains of Yazd province, which has 75% of the population density of the province and the most industrial centers. In addition, this plain has been banned by the Ministry of Energy due to a sharp drop in groundwater levels. In this study, the amount of subsidence was obtained and compared using 4 SLC images of the C-band of the Sentinel-1 satellite and the radar differential interferometry method from 2017 to 2021. The maximum amount of subsidence in 2017 was 13 cm and in 2020 and 2021, 9 cm, which is related to the Shamsi region in the area between Meybod and Ardakan. Also, to ensure the results of satellite images, they were compared with the results of the accurate leveling method performed by the Iran National Cartographic Center. It was observed that sentinel images have a good ability to estimate the amount of subsidence. According to the study of groundwater consumption and depletion statistics in recent years, possible reasons for the reduction of subsidence in the study area can be management measures such as water transfer to this basin, change in agricultural practices and reduction of groundwater depletion compared to years ago in this area.

Hadi Nayyeri,
Volume 15, Issue 37 (9-2015)

The subject of the study is to analysis pattern of Mahabad River channel. This area is located on the south of Uromia Lake. Rapid changing of its channels pattern is an important characteristics which the evaluation of these characteristics is necessary to any hmplementation of development projects. For this purpose, the morphological changes of river channel were recognized by the areal photographices and satellite imageduring different times periods. The relationship between effective variables on the channel pattern such as, discharge, slope, stream power,stream bank clay content and width of bed, and observed pattern changes were analyses. The results showed that formation of braising channels could be the result of accumulation of bank coarse materials and increasing of width to depth ratio. The pattern of the river changed to sinuosity at the downside of braiding channel.the increased discharge and more river bank resistance due to high clay content caused to river pattern changed from breading to sinocity.In the distance between Mahabad dam at the upstream and diversion dam at the downstream, the river pattern was changed to Anabaranching. Assessment and comparison of Arial photographs before and after of Mahabad dam construction revealed that these types of channels were developed recently. Reduction of peak flows and sediment deposition in the channel as the result of dam construction, prepared the essenssial conditions to form Anabrancing
Dr Javad Sadidi, Dr Hani Rezayan, Mr Mohammad Reza Barshan,
Volume 17, Issue 47 (12-2017)

Due to the complexity of air pollution action, artificial intelligence models specifically, neural networks are utilized to simulate air pollution. So far, numerous artificial neural network models have been used to estimate the concentration of atmospheric PMs. These models have had different accuracies that scholars are constantly exceed their efficiency using numerous parameters. The current research aims to compare Elman and Jordan recurrent networks for error distribution and validation to estimate atmospheric particular matters concentration in Ahvaz city. The used parameters are relative humidity, air pressure, and temperature and aerosol optical depth. The latter one is extracted from MODIS sensor images and air pollution monitoring stations. The results show that Jordan model with RMSE of 219.9 milligram per cubic meter has more accuracy rather than Elman model with RMSE of 228.5. The value of R2 index that shows the linear relation between the estimated from the model and observed values for Jordan is equal to 0.5 that implies 50% estimation accuracy. The value is because of MODIS spatial resolution, inadequacy in numbers as well as spatial distribution of meteorological station inside the study area. According to the results of the current research, it seems that air pollution monitoring stations have to increase in terms of numbers and suitable spatial distribution. Also, other ancillary data like volunteer geographic air pollution data entry using mobile connected cheap sensors as portable stations may be used to implement more accurate simulation for air pollution.

Engineer Elham Azizikhadem, Doctor Kazem Rangzan, Doctor Mostafa Kabolizade, Engineer Ayob Taghizadeh,
Volume 18, Issue 51 (7-2018)

The tourism industry has become a major economic activity in the early years of the 21st Century and is considered one of the most productive and most employment-oriented global industries. Tourism is one of the most important factors generating wealth and employment in the world. It is necessary to plan for the proper exploitation of this industry, The most important steps to plan are to locate sites for providing tourists with the services they need in the form of tourist villages, This research is for the city of Shush which is one of the most important tourist areas of Khuzestan province And since it has many ancient monuments, it has attracted many tourists, , But the city has been at a very low level in terms of having a space worthy of tourists. Therefore, the conditions reinforced the idea of creating a tourism village. In this research, location-based discussion was conducted through a fuzzy inference system, Finally, the Fuzzy Topsis method has been used to protect the environment and to some extent extend sustainable tourism development. The ranking of these sites is based on environmental criteria. In the fuzzy inference system by applying the layers required in this method, four sites are considered to be very suitable.Then, using Fuzzy Topsis, which includes 10 criteria and 4 options, identified the best site on site 4. This site will bring the least damage to the environment, Located on the banks of the Dez River, most of the area has been covered by ground. In terms of maintaining environmental criteria, the site has a completely organic environment than other sites.
Mr Sirous Hashemi Darebadami, Dr Ali Darvishi Boloorani, Dr Seyed Kazem Alavipanah, Mr Mohammad Maleki, Mr Reza Bayat,
Volume 19, Issue 52 (3-2019)

The term urban heat island (UHI), described the phenomenon of climate change in urban areas compared with surrounding rural areas. UHI effects include: increasing in energy and water consumption, air pollution expansion and interfering in thermal comfort. Surface urban heat island (SUHI) contains patterns of land surface temperature (LST) in urban areas that has interaction with UHI in urban canopy layer and urban boundary layer and investigate with thermal remote sensing. SUHI has diurnal and seasonal variations so requires multi-temporal data to analysis SUHI. In this study, the multi-temporal MODIS (Aqua and Terra) data product were used to analyze the SUHI in day and night in Tehran metropolitan. Physical and biophysical surface properties such as: land cover/land use (LULC), elevation, albedo, vegetation index (NDVI) and impervious surfaces index (NDBI) were used to interpretation of the LST and SUHI changes. The results showed that SUHI in Tehran, has spatial-temporal diurnal and seasonal variation. So that during warm days the surface urban cool island (SUCL) is formed in Tehran. At night times, SUHI index values was different between 2 and 5 ° C (maximum in the spring). The results also showed that different of land cover thermal properties, albedo and elevation was the most important factors is the diurnal changes of SUHI while phonological changes of vegetation and albedo, was the most important factors in seasonal changes of SUHI.

Dr Javad Sadidi, Mr Seyed Hassan Hosseini Sajedi, ,
Volume 19, Issue 53 (7-2019)

Timing framework associated with catastrophes is one of the most important issues in crisis management. In such cases, being immediate has a considerable importance and web based real-time routing service as an important tool has a significant role in relief operations improvement. At this study, a web-based real time routing service based on open source technology has designed for 11th district of Tehran aiming to efficiency enhancement of relief teams at emergency conditions. In this service ANP model was used to evaluate increasing interaction between the factors, and since the purpose of this study was to find the best possible routs between two nodes by non-negative weight according to the main distance factor, Dijkstra's algorithm has been chosen as a proper routing algorithm. Open source languages, format, libraries and software such as HTML, CSS, AJAX, GeoJSON, PHP, OpenLayer, PostGIS were also used to design the service and applying online weightings, blocking each piece of routes and re-routing procedure without blocked traffics, implementation of server-side processing and reducing the volume of the client-side’s operations, being under the browser’s surveillance, no need to install any software and the ability to use it on any operating system can be named. According to the obtained results, the path’s length and traffic’s volume variables have the most important role in target function formation (travel cost) therefore the specific path will be selected as the optimal path, with the minimized distance between the destination and the traffic volume. Depending on the traffic volume severity changes, the optimal extracted route will be changed and the system has such ability to apply online weighting in order to instantaneous routing to reduce losses.

Miss Rahimeh Rostami, Dr. Ali Mohammad Khorshiddust, Dr. Mohammadreza Nikjoo, Dr. Hassan Mahmudzadeh,
Volume 19, Issue 55 (12-2019)

The drying of Lake Urmia has had many environmental impacts on the surrounding areas of the lake. In this research, efforts have been made to identify vegetation coverings that are compatible with the study area and then it use of multiplicative decision-making models for identify areas susceptible to cultivation of these products. In the present study, following the study of species in the region of rapeseed, was selected as a suitable halophytes plant. Initially, using Landsat 5 and 8 images, the changes in the land use type and vegetation cover type of the region were investigated from 2000 to 2016, and after calculating the changes, the potential planting of the halophytes plant was sought. The ANP Fuzzy method was used to estimate the ability to cultivate rapeseed. Main criteria used in this research are topography, soil and meteorology. The topographic sub criteria are included: height, slope and tilt direction, soil criteria including soil texture, soil salinity, and soil pH and soil organic matter. Finally, the criteria for meteorological data are total annual precipitation, Relative humidity, average annual temperature, maximum annual temperature and annual minimum temperature. These layers first be changed to fuzzy and then, applying the weight of each of the following criteria, a map of the main criteria of soil, topography and meteorology was prepared and finally, by combining these three main parameters, the potential mapping was obtained. The results indicate a 25.43 percent reduction in water content and an increase of 21.03 percent in saline areas between 2000 and 2016, and the results of identifying areas susceptible to cultivation of halophytes plants have identified 14.28 percent of the study area suitable for rapeseed cultivation.

Mr Asadollah Mollazehi, Dr Mohammadreza Pudineh, Dr Mahmood Khosravi, Dr Mohsen Armesh, Mr Aliasghar Dehvari,
Volume 20, Issue 58 (10-2020)

Today, due to climate change, natural hazards and how to deal with them are among the most important concerns of researchers in environmental planning and crisis management. The purpose of this study is the assessment of the potential flood risk in Sarbaz drainage basin. For this purpose, the databases including elevation, slope, geological characteristics, soil characteristics, precipitation, vegetation, land use, and vector layers of the main channel, streams and drainage densities of the basin were used. By using the questionnaire and experts' opinion as well as hierarchical analysis, the weight of influences of each layer was calculated in basin flooding. Each of these layers was classified based on the flood potential from low to high-risk scale and eventually merged with the weighted overlay model in Geographic Information System. The results showed that main streams, land use, and precipitation are the most important components in the flood risk of the Sarbaz river drainage basin. From the total area of the Sarbaz basin, only 0.5% has a high to extremely high flood potential, and the central areas of the basin have the highest potential for flood due to topography and special hydrographic conditions. In addition, the main river basin districts towards the outlet of the basin as well as parts of the margins of important sub-streams have the highest flood potential. Despite the limited area of the high-risk zone, due to population density and agricultural land, the importance of this area is very high in crisis management.

Javad Sadidi, Sabah Motamedi, Dr. Hani Rezayan,
Volume 21, Issue 60 (3-2021)

Complexity of multi dimension developments and infrastructures intensifies the land related challenges to adopt legal laws, restrictions and responsibilities.  Although, multi dimension estates have been registering for many years, as the complexity of the estates are increased, disadvantages of the 2D cadaster is more appeared. Hence, the 3D cadaster has been a necessity for sustainable development. Visualizing is one of the important components of 3D cadaster. In the current research, for efficient and effective visualization of land ownerships and their related 3D information, firstly, the needed essentials of cadaster visualization systems have been classified into 3 groups including: cadaster, visualization and independent properties. Then, the trends of 3D visualization developments for older plugin and WebGL based technologies have been considered. Finally, a number of the most important systems according to the needed criteria for web-based 3D cadaster were evaluated and consequently, Cesium virtual environment has been selected as the best for the development purpose. To develop a system for 3D cadaster visualization, 2D building properties was converted to 3D using different software and then, land law properties were added and subsequently, Building Information Model (BIM) was provided. HTML5, JavaScript and CSS languages along with WebGL library and Cesium API were utilized. The implemented service is able to display WFS-based standard vector layers as well as WMS image of OGC standard. The system has the possibilities of 3D visualization like web-based 3D cadaster visualization and land law properties over the web. This enables the user to make the printed output of BIM along with descriptive information of the buildings.

Phd Mohsen Ahadnejad, Asghar Teymouri, Mahnaz Vaez Livari, Hossein Tahmasebi Moghaddam,
Volume 21, Issue 63 (2-2022)

Housing as one of the basic human needs a significant impact on the health and improve the quality of life of individuals. The quality of housing as one of the main foundations of a comprehensive program and a necessary tool for expressing the various dimensions of economic, social, cultural, environmental and physical development of sustainable, has a special place in urban planning. The purpose of this study is to analyze the spatial quality of housing quality in urban neighborhoods in central Zanjan city. The type of research is applied and descriptive-analytic in nature. The information gathering method was used by the library method (set of statistical blocks of 1395 and detailed plan of 1394). Combined methods of the Tedim model and the geographic information system are used to analyze the data. The results of the research show that inequalities are found among the middle areas of Zanjan city. In the residential areas, 18.91% of the low-quality housing, including the besim neighborhoods, ghabrestan balla, Vahdat, Khatam, Amadgah, Goljak Abad, 21.80% of the dwellings The relatively low quality of the ashaghi gabristan, the shahada, Meydan enghelab , alley waliasr, Niksazan, 22.71% of the average quality housing, including the district of the Forodgah, Rajaee Town, Amjadiyeh, Najaem, Qadas, Fateh, 17.43% of the relatively high quality housing Which includes eastern Ansariyah, Vahidieh, Shoghi, 17  Shahrivar, shahada masged, Goniyeh, Ja'fariyah and ultimately Lots of Azadi, Ansarieh, Etemadieh, Black Alley, North Saadi 19.15% of the houses are of high quality.

Dr. Hassan Mahmoodzadeh, Mr Musa Vaezi, Mrs Rahimeh Rostami, Mrs Maedeh Bakooyi,
Volume 22, Issue 65 (6-2022)

Considering the unfavorable environmental conditions of cities, the shortage and defects of open and green spaces in metropolitan cities, the need to pay attention to parks and green spaces of the city in terms of ecological and social functions of these spaces has been discussed more than before. For this purpose, this research has been investigated. And ecological analysis of regional parks in Tabriz city. The present research is analytical-descriptive in terms of its purpose. The information was collected in both documentary and field and analyzed using the GIS. The statistical population of the study is Tabriz Parks and Samarkand Pars in Tabriz, including Eagly Parks, Bagh Misha, Shams Tabrizi and Eram Parks. The methods and tools used for collecting and analyzing information in this research are questionnaire, ARC.GIS software, ANP network analysis method and MC-SDSS function and SAW method in GIS. Evaluating ecological indicators in four major axiological areas and ecological, environmental, cultural-educational and access design. For these indicators, criteria have been considered. Using the questionnaire, the importance of these criteria was obtained and the weight of the criteria was calculated by ANP method. In the studied parks, according to the results of the geological survey, the Eagle Park is in ecological terms, and the Shams, Baghmehisheh and Eram parks are in the next ranks, and the point is the inappropriate situation of the Eram Park and Baghmehisheh Parks, especially Eram, in comparison with other parks. It needs to adopt appropriate policies in this regard to improve its situation.
Ali Khedmatzadeh, Bakhtaran Feizizadeh,
Volume 22, Issue 67 (12-2022)

Quality of life is one of the important issues that was first brought to the attention of scholars by the extensive development of technology and industrialization process in the Western countries, and it is increasingly being studied in this field, and this is important due to the increasing increase in quality of life studies in public policy monitoring. Quality of life can be used as a powerful tool for monitoring community development planning. The existence of spatial and spatial inequalities in the city has caused many problems, including the weakness of resources, inappropriate housing, the problems and damage caused by social inequalities, and undermined the quality of life. In this research, that of terms methodological, descriptive-analytic and in terms of purpose, it is functional used the statistics blocks of Urmia, in the census of 1395, and remote sensing data in combination with GIS have been to understand the quality of life in the 5 regions of Urmia. The criteria defined in this research are in 4 sections: social (including 9 sub-criteria), access to public services (5 sub-criteria), physical (4 sub-criteria), natural (4 sub-criteria), which are based on decision analysis Multi-criteria and integration of layers in the GIS environment. Weights obtained for social dimensions, access to public, natural and physical services derived from network analysis model  are respectively 0.506, 0.323, 0.116 and 0.055. The results show that as far as the southwest is moving along the northeastern part of the city, blocks that have a better quality of life are rising.  In the urban regions of the region 2, quality of life is more favorable than other urban regions. The results of such studies can help urban planners to better understand and prioritize urban issues as a dynamic environment.

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