Changes between Version 1 and Version 2 of orthorectification


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Timestamp:
Oct 19, 2010, 8:03:01 AM (14 years ago)
Author:
pborissow
Comment:

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  • orthorectification

    v1 v2  
    33{{{
    44#!html
    5 <table align="right"><tr><td><img src="" border="0" /></td></tr></table>
     5<table align="right" width="350"><tr>
     6<td><img style="padding-left:15px;" src="/ossim/raw-attachment/wiki/orthorectification/pre-ortho.jpg" border="0" /></td>
     7<td><img style="padding-left:15px;" src="/ossim/raw-attachment/wiki/orthorectification/post-ortho.jpg" border="0" /></td>
     8</tr>
     9<tr><td colspan="2" style="padding-left:15px;font-size: 8pt; font-family: 'Lucida Grande',Geneva,arial,helvetica,sans-serif;
     10">Above are 2 images of the same geographic area. Note the road that passes through the mountains. In the left "raw" or unrectified image, the road appears to be crooked when in fact it is not. The image on the right has been rectified image and the road appears planimetrically correct.</td></tr>
     11</table>
    612}}}
    713
    8 Orthorectification 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.
     14Orthorectification is the process of removing the effects of image [wiki:tilt_displacement perspective] (tilt) and [wiki:relief_displacement 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.
    915
    1016The requisite inputs for orthorectification:
     
    1218 1. A elevation model of the ground surface in DEM, DTED, or SRTM format
    1319
    14 The 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.
     20The resulting accuracy of the orthoimage is based on the accuracy of the triangulation, the resolution of the source image, and the accuracy of the elevation model.