Parent Topic: Mosaicking

Mosaic Cut Line

When images to be mosaicked overlap, it is useful for the user to specify a cut line determining which image takes precedence in different areas. This is done in GCPWorks on the ``Mosaic Area Collection'' panel.

The cut line is a polygon, enclosing the region to be replaced in the georeferenced image. Any of the image pixels within the polygon will be replaced by pixels from the uncorrected image if possible. Georeferenced pixels will not be replaced if the corresponding location is off the uncorrected image, or if the pixel value on the uncorrected image is the ``Background Value''.

The ``Mosaic Area Collection'' panel also contains options for loading and saving the cut line to or from a vector segment on a PCIDSK database.

Note that it is currently only possible to have a single mosaic cut line per mosaic operation; however, it is possible to perform many mosaic operations from one uncorrected image to one georeferenced image, each time selecting a region with a different cut line. To do this, it is necessary to alternate between the ``Mosaic Area Collection'' panel and the ``Disk to Disk Registration'' panel to collect cut lines, and perform mosaics.