When editing a digital elevation model (DEM), it is often useful to view the full-resolution ortho images associated with the DEM to preview how your changes may affect the final ortho image as you work.
When you generate a DEM using PCI technology, the program uses input left, right, and, optionally, middle raw images to generate epipolar-image pairs. From these, it generates a DEM, which is actually a digital surface model (DSM) at a coarser resolution than that of the input images, depending on the specified settings. Along with the DEM, the program includes a lower-resolution ortho-preview image using one of the epipolar images.
If you are editing a DEM that was not created with PCI technology, you can associate raw images with that DEM so that you can apply on-the-fly orthorectification to the images, which you can use to assess any edits you have made to the DEM. For more information about associating raw images with a DEM, see Managing images to orthorectify.
When you select a DEM layer, and then open the DEM Editing window, Focus automatically opens the associated lower-resolution preview layer in the view pane of the Focus window (when such a layer exists). While the lower-resolution imagery can be useful in providing context to a location in the DEM, it is often more practical to see a full-resolution preview of some of the raw imagery orthorectified with the edited DEM.
In either window you can verify that the changes you have made to the DEM are suitable when you regenerate the orthorectified imagery by using the edited DEM.
The benefit of viewing your regenerated orthorectified imagery in the Live Ortho Preview window is that the preview reflects the changes you have made to the DEM. You can drag the imagery to various locations to inspect each and, as you do so, the Focus window is updated in real time to display the corresponding image at the same location in the view pane.
In the Full Res. Ortho Preview window, you can view a specific area of the image to work on, and then use tools, such as Flicker Left/Right Image to quickly and easily identify, for example, differences in elevation, because by flickering you can see movement of features between the left and right image.
For more information, explore the following topics:
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