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ENVI

Build ASTER Geometry Files

Build ASTER Geometry Files

Use ASTER Build Geometry File to build an ASTER geometry file to calculate the x and y coordinates for each pixel. You may select the desired projection for the coordinates.

You can georeference the ASTER data by using the results from this procedure as the IGM input file in the Georeferencing from Input Geometry function.

Tip: The capability to georeference is only available for ASTER level 1A data. ASTER level 1B HDF files already contain georeferenced data and are typically in a UTM projection with a rotation. To convert ASTER Level 1B to north-up UTM or other projections (that is, without rotation), select Map > Convert Map Projection from the Toolbox.

You can also achieve the conversion using orthorectification.

  1. Open an ASTER file by selecting File > Open from the menu bar.
  2. Select Geometric Correction > Build Geometry File by Sensor > ASTER Build Geometry File from the Toolbox. The Input ASTER Level 1A Image dialog appears.
  3. Select an ASTER Level 1A image file.
  4. Click OK. The Build IGM for ASTER Data dialog appears.
  5. Select the desired map projection for the x,y coordinates by selecting a projection type from the list.
  6. Select output to File or Memory.
  7. Click OK. ENVI extracts the needed information from the ASTER header file and adds the resulting output to the Layer Manager.



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