Ortho Processing
Orthorectification is a process that corrects for geometric distortion inherent in remotely sensed imagery to produce a map-accurate orthoimage. Orthoimages can then be edgematched and color balanced to produce a seamless orthomosaic. This orthomosaic is accurate to a specified map scale accuracy and can be used to make measurements as well as generate and update GIS feature class layers.
Input and Deliverables
Ortho Processing Input
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Digital imagery - Can be in the form of a digital airborne image, scanned image or satellite imagery.
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Aerial Triangulation and related project set up files.
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DTM - Digital elevation of the earth, not including the elevation of any objects on it. This is also referred as bare-earth elevation. The bare earth DTM dataset is used to produce the orthoimage and orthomosaics.
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Area of interest, tile Boundary ans Output GSD (Ground Sample Distance)
Final Deliverable
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4-BAND (RGB + NIR) and 3-BAND (RGB) orthoimagery
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GeoTIFF
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ECW (Enhanced Compression Wavelength)
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MrSID image formats in standard
