Geocoding a digital elevation model

Geocoding means that you are reprojecting the epipolar digital elevation model (DEM) to the ground coordinate system at a given ground resolution.

Note: If you selected Create Geocoded DEM on the Automatic DEM Extraction window, your epipolar DEMs are already geocoded.

To geocode a digital elevation model:

Under Input DEM, in the File field, type the path and file name of the extracted epipolar DEM; alternatively, click Browse to select the file.
From the DEM channel list, select the number of the channel that contains the DEM.
From the Score channel list, select the number of the channel that contains the correlation score for each DEM pixel.
In the Failure value field, type the value used to represent the failed pixels in the input DEMs.
In the Background value field, type the value used to represent the background, or NoData, values.
Under Input Window, select one of the following options:
- Full image: to export the entire DEM
- Window: to export a specific area of the DEM. In the Offset fields, type the pixel (P) and line (L) coordinates of the upper-left corner of the area. In the Size fields, type the number of pixels (P) and lines (L) to specify the size of the window.
In the Epipolar DEM clipping field, type the amount of data to be clipped from the epipolar DEMs before merging and geocoding.
Specify the units as pixels or a percentage (percent) of the image size.
Under Output DEM, in the File field, type the path and file name of the output geocoded DEM; alternatively, click Browse to select a location.
In the Resolution fields, specify the X (horizontal) and Y (vertical) resolution of the output pixels.
From the Output option list, select the DEM merging option to use when multiple epipolar DEMs are geocoded and added to the output DEM file.
Available options are:
- Use last value: uses the last value to replace the pixel values in the overlapped area in the existing geocoded DEM by the pixel values of the geocoded DEM that is added to the file. This is the default option.
- Average: replaces the pixel values in the overlapped area by the average pixel values between the existing geocoded DEM and the one that is added to the file.
- Highest score: uses the highest score to replace the pixel values in the overlapped area by the pixel value with the highest correlation score between the existing geocoded DEM and the one that is added to the file.
Optionally, select the Fill holes check mark to enhance the output quality of the DEM by interpolating the failed values automatically. Clear the check mark to set all the failed pixels to the background value in the output DEM.
Click Geocode DEM.