Use Georeference COSMO-SkyMed (DGM) to georeference a COSMO-SkyMed Level-1B file. ENVI uses only the four corner points of the image in georeferencing. No DEMs are used to assist in georeferencing. Follow these steps to continue:

1. Open a COSMO-SkyMed Level-1B Detected Ground Multilook file (indicated by DGM in the filename) by selecting File > Open As > Radar Sensors > COSMO-SkyMed from the menu bar.
2. Select Geometric Correction > Georeference by Sensor > Georeference COSMO-SkyMed (DGM) from the Toolbox. The Select COSMO-SkyMed Filename dialog appears.
3. Select an input file and click OK. The COSMO-SkyMed Registration Parameters dialog appears.
4. Use the settings in this dialog to select an output projection and to specify how to extract geolocation points from the COSMO-SkyMed file:
• Select Output Projection For Registration: Choose the projection into which to warp the data. The default projection is UTM (if map information is available).
• X Pixel Size/Y Pixel Size: Set the output data pixel size in units of degrees, meters, or feet. The units to use depends on the units used for the selected projection. If your input image does not have a pixel size defined, the default values are 30 meters for both x and y. If pixel size data is included in your file, those values appear in the X and Y Pixel Size fields.
• Enter Output GCP FileName: Allows you to optionally save the extracted GCPs in a file with a specified name.
5. In the Enter Output FileName field, enter the filename for your georeferenced image.
6. Click OK. ENVI adds the resulting output to the Layer Manager.