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Model adjustments

When adjust model is selected in the action radio box, you can eliminate an existing y-parallax in the stereo pair. If you have a mixed stereo pair (see section on input images), the sensor models of the two images usually do not match. This makes it impossible for a measured object in the first image to be overlaid on the corresponding object in the second image. When you have selected adjust model, you can correct this by clicking on the corresponding point in the first and second image. Instructions are given to the left in the data capture view:

Figure 10.2: Instruction to measure y-parallax. (Left: After measuring in first image. Right: After measuring in second image.

When you have measured the same point in both images, lines will be drawn to guide you how the model will be adjusted. You are prompted to accept or decline the adjustment. Accepting the adjustment will overwrite the transformation file of the seondary image so that the model adjustment will be applied. A copy of the original transformation file will be saved. The copy will have the name filenameN.ext, where N is 1 if it is the first backup, 2 if its the second etc, and ext is txt or rpb depending on satellite. A message box displays the name of the saved sensor file.

Having removed the y-parallax in one point, there may still be y-parallaxes in areas far from that point. You can remove the y-parallaxes in a second point and still maintain the model at the first measured point. A third point will however be treated as a new first point.