عنوان مقاله [English]
The environmental quality of the city is a dynamic and multifaceted conception that addresses the possible natural and human factors in different spatial scales. Satellite information is the only suitable source of information in order to achieve the continuous dynamic characteristics of urban environments in cities. However, until recently, satellite sensors were not able to record and display details of urban areas. Since urban information systems require high resolution data, aerial photography has been used as standard image input. In any case, the invention of new satellites with multi-spectral and high-resolution sensors (1 meter or less for Quick Bird, Ikonos satellites) and digital aerial scanners with excellent geometric characteristics and appropriate spatial resolution in scale of centimeters, has challenged the technology of analog aerial photography. High-resolution multispectral sensors and digital photographs, along with the location and coordinate data of the global positioning system and automatic navigation systems, create the conditions for updating the database of GIS. Another source of three-dimensional information for modeling is the sensors with laser scans that produce relatively accurate, high-quality altitude information. The paper focuses on the process of the development, the description of spectral combination techniques and the specifications of the images in order to properly assess the urban quality and environment.