Changes between Initial Version and Version 1 of orthorectification


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Timestamp:
Oct 19, 2010, 7:52:22 AM (14 years ago)
Author:
pborissow
Comment:

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  • orthorectification

    v1 v1  
     1= Orthorectification =
     2
     3{{{
     4#!html
     5<table align="right"><tr><td><img src="" border="0" /></td></tr></table>
     6}}}
     7
     8Orthorectification is the process of removing the effects of image perspective (tilt) and relief (terrain) effects for the purpose of creating a planimetrically correct image. The resultant orthorectified image has a constant scale wherein features are represented in their 'true' positions. This allows for the accurate direct measurement of distances, angles, and areas (i.e. mensuration). Orthorectified images are commonly used as in visualization tools such as Google Earth, OSSIM Planet, !ArcMap, WMS, etc.
     9
     10The requisite inputs for orthorectification:
     11 1. An image with accurate sensor geometry
     12 1. A elevation model of the ground surface in DEM, DTED, or SRTM format
     13
     14The resulting accuracy of the orthoimage is based on the accuracy of the triangulation, the resolution of the source image, and the accuracy of the DTM.