Document Type : Research Paper

Author

• Mahdi Modiri

Associate Professor of Urban planning, Malek-Ashtar University of Technolog

Abstract

Digital orthophoto contains maps and geometric features of the map, and is accordingly able to:
1) As a source of spatial geography, be complemented by descriptive information.
2) Provide a base on which other data are recorded and adjusted.
3) The results of using it will be available to match landscapes.
In many countries, digital orthophoto is an important part of the graphic documentation, and is used at strategic levels, which provides appropriate cartographic features on a national scale.
Digital orthophoto has a strong potential for analyzing the geographic information system (GIS) data. Not only is orthophoto a layer of information, but the connection of orthophoto digital data presents a new perspective to automatic extraction of positional data (point, line, and surface) and altitude information.
A large-scale orthophoto is prepared with a great deal of details, and makes the revision of many of information layers possible, and in some cases, plays a background role and is used to represent the position of elevation features. Therefore, large-scale satellite orthophoto has, in many cases, overcome the defects of orthophoto and, in accordance with the scale of study and urban planning, presents a valuable efficiency in detecting buildings hidden among complexes and high-rise buildings.

Keywords

• orthoimagery
• orthophoto
• digital orthoimagery
• urban orthoimagery

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