Projections can compensate for distortions in large-scale imagery that cover a large Earth surface, where distortions are produced from the Earth's curvature. These are the same distortions that occur in projecting a spherical surface (the Earth) onto a flat surface (the image database). Although there are still distortions in all projections, some are removed or compensated for, depending on the projection used.
When an image is tied to one projection, it can be projected automatically to overlay another projection. This provides options for processing your data by matching goals to the appropriate projection.
The software used for the projection transformations is the General Cartographic Transformation Package (GCTP), produced by the U.S. Geological Survey and can be used to do the following conversions:
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