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Uncorrected RGB data
Corrected RGB true ortho image
| | The TopoSys process of generating true ortho images is an automatic one.
The digital elevation model generated from the laser data and the RGBI scanner files synchronized with the flight position data serve as input for the ortho image computation. In addition to the ortho image computation of the flight strips, the geocoding of the measurement points is directly performed. The result is a four-channel, high-resolution ortho image in the state plane coordinate system. Depending on flight altitude, the resolution is in the range of 0.2 – 0.5 m, resulting in a scale of up to 1:2500.
In a further step the individual strips are joined to form an image mosaic, whereby the radiometric balance between the strips is likewise corrected by an automatic process. Perspective shading can be computed separately and – given corresponding overlap – can be filled by neighboring strips.
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