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It should be mentioned that presenting an urban development model for using in GIS has a lot of restrictions and limitations which cannot be described in a few pages of a paper. Some other factors that have been considered in presenting the model include: Weather and climate, landform, elevation and geographical direction, geology, bedrock, soil , water , resources , vegetation , installations and buildings , energy transmission stations , transportation network , natural resources , gardens , forests ,parks industrial sites and all other urban development indexes and also the existing limitations. The priority of the mentioned parameters are different in the model .It was mentioned that as the North-West of Tehran has an urban developed context and is under the interactive effects of the large city of Tehran, it is impossible to correctly analyze the environmental conditions of this district without considering the social and economic activities in this district.

Some of the environmental standards that are considered in the model are as followings:

1 Causing any kind of abnormal cacophony function, extensive vibrations, smoke and other air pollution factors, smell, radioactive radiation, solid and liquid wastes are prohibited and all of these factors should be omitted from protected area during identified project performance, and this condition has been considered in the model.

2 Sound protection standards (recommend by Wilson Committee in England. There are 10 articles in the principles of Tehran Comprehensive Project, which indicates the maximum and minimum noise intensity for different urban spaces with different functions which are used in the presented model.) Since it takes a long time, some examples have been brought in the paper. For more detailed descriptions, you can refer to Tehran Comprehensive Plan.

3 Establishment of a green belt zone by planting ever-green trees around noise pollution factors.(More details about how to lessen the sound intensity ,have been considered in Comprehensive Plan of Tehran .) the details of controlling noise pollution are used in the model .

4 To prevent the pollution of underground waters of Tehran, principles suggested in Tehran Comprehensive Plan are used in the model. In order to evacuate the hog-wash of home, commercial, administrative and industrial sewages, some standards have been suggested in the plan. Preparing the specified spaces to gather the additions and garbage of consumption materials, have also been used in this project.

Meanwhile compounding datum resulted from remote sensing technology and the analysis of changes are presented as specification of the model during last decades, but not as a case study. It means that in all studies of urban development, as we are facing with very quick changes, especially in Tehran and other large cities of Iran, we need to review the last experiences and investigate the process of changes. To identify the other physical resources, digital maps of Tehran at the scale of 1:10000 are used in this project. The Arcveiw software has been chosen for identification of operations and for analysis and assessment .It not only has the capabilities of search and data retrieval, but also is able to analyze the spatial information, together with network and three-dimensional analysis capability. Meanwhile, in order to identify and analyze the specifications of land-use changes during the last decades the PCI software has been chosen.

Suitable patterns for presenting model of urban applications in Tehran

1-Suitable pattern for parks and green areas application:
A 25% slope as well as, East and South geographical directions and the altitude of 1800 meter are acceptable. Constructing green areas suitable with bio- climate of the industrial areas as well as highways spaces and big installations spaces with 10-100 meter depth based on neighboring status of the urban operations with considering current executive regulations for keeping bio-environment, comprehensive plans of trees (those trees bearing sharp leaves or those having permanent leaves ) creating ; suitable situation with mentioned conditions at lakes and mountains area 1400m-1800m with suitable soil and water accessibility. It's recommended to keep the existing, natural and public parts as well as surrounding orchards and areas.

2- Suitable pattern for residential application:
A slope lower than 9%; height lower than 1800m; south foot hill of geographical directions; bed rock; sandstone , basalt run ; alluvial fan; limb stone ;clay stone; Granite ; crack tuffs ; runs between pleats ; loss ; alluviums(alluvial fan , valley constructing alluviums; water resources at least 150 lit/day for each person individual not be into the direction of whirlwind ; seasonal wind and not to be located on the faults and earthquake areas.

They also should not locate at dry beds of the rivers, flood way and natural waterway passes .Do not places on water , electricity transfer way and bears authorized distance and have the lowest distance to urban , service and commercial area and be far from the industrial and workshop area ; do not placed at urban installations and equipment , public green areas , parks and lakes , spaces, roads network and transportation networks ; have the nearest accessibility ways to other urban area through public transfer .transportation networks at the region should bear the lowest distance with the said facilities . At residential place finding distances from highways, main streets and surrounding places of industrial and installation centers as well as those areas creating noise and air pollution should be observed .Meanwhile neighboring with companies , districts , residential area should be considered and the best service and urban facilities and places at least at 5 KM distance .

3- Suitable patterns for workshop and industrial application:
Placed at the slop lover than 9%; south and east and west geographical directions should be observed and constructed at the highs up to 1400m .industrial centers should not cover underground waters reservoirs and does not apply agricultural soils. Don't hazard the safely of natural areas of the region do not placed at the borders of parks, tourist areas and recreation clubs and secure monuments .Don't pollute recreation centers located on rural area and don't cause qualitative loss of such areas; be far from river, lakes and orchards, be at standard distances of residential and commercial centers so that the said centers will be in adequate distance for probable environmental damages that may cause; (Refer to environmental protection standards of the Comprehensive Plan in Iran) ;Green areas with mentioned suitable distances at the environment comprehensive protection plan should be considered at industrial areas.

4- Suitable pattern for recreational application:
Topography conditions at sightseeing and tourist area should be at least between the height 1200-1800m.Slope up to 15% is acceptable. For the area used by those tourists who want to spent their leisure time at indoor area ecological model of Iran for urban development plan has been used.

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