Fernerkundung I (Digitale Bildverarbeitung) - Friedrich-Schiller ...

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Abb. 6: Image Works Configurationsdialog Abb. 7: Image Works Viewer
3.8 Geomatica OrthoEngine – creating an ASTER DEM from scratch: The following description is from an online tutorial of PCI Geomatics about ASTER DEM generation (www.pci.on.ca). The ASTER Earth Observation Satellite is unique in that it offers nearly simultaneous capture of stereo images, minimizing temporal changes and sensor modeling errors. Band 3 of the VNIR sensor includes two channels, a Nadir looking scene and a Backward looking scene. This provides stereo coverage from which a DEM can be automatically extracted. Aster Level 1A and Level 1B are both supported for DEM extraction and ortho rectification by OrthoEngine. Each does have its own set of benefits and draw backs that you need to consider. Level 1A is not corrected, level 1B is and therefore has the potential to produce less accurate results than level 1A when you are using quality ground control (the difference is negligible if you are relying on the GCPs supplied with the sensor). Level 1A also enables you to use the stitching function to stitch continuous scenes from the same path. This can reduce the number of GCPs and tie points required and reduces the seam you may get mosaicking DEMs from the same path. Level 1A does have an offset in the SWIR bands that is fairly significant so if you need these bands for multi-spectral analysis you may want to consider level 1B as this offset is corrected for in level 1B, but not level 1A. Also level 1B has been rotated so the stitching routine cannot be used with level 1B imagery. The following is a brief tutorial on the use of Geomatica OrthoEngine for ASTER DEM Extraction. Step 1 Project and Projection Setup • Select File > New to create a new project in OrthoEngine. • Enter a Filename and Project Name.Select “Satellite Orbital Modelling”. • Select “General High Resolution” model. “Accept” • Set the Project Georeferencing and Output Pixel Spacing. For the VNIR bands of ASTER, this will be 15m Abb. 8 OrthoEngine project window Step 2 Data Input • Select the “Data Input’ processing step. • Select READ from CD
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