What is the difference between “Load Seam Polygons” and “Load Reference Seam Polygons” in MosaicPro?
The “Load Seam Polygon” function allows you to load an existing polyline file that becomes an active file. The operator can make edits to this seam polygon/polyline and use it to deal with image overlap areas during the mosaic procedure.
The “Seam Line Reference File” is an existing file that can be loaded into MosaicPro and used as a reference on the background to change/adapt/modify the active image. It is not used to mosaic, merely as a reference source. A typical example is its use with larger projects to help line up near the edges when merging mosaics.
The logic is that for some large mosaic projects the actual mosaic jobs are done in a piecewise fashion (e.g., you might be doing one county, then another beside it), so the benefit of being able to load reference is that it enables you to line up the far edges of the project adequately so that the two output mosaics will line up properly. This is more applicable to large mapping organizations (e.g., state or national) rather than private commercial firms. Likewise, the reference seams can also be useful for update mapping.