index coverageThe polygon coverage that describes, and is used as a spatial index for, the tile structure of a layer. Each polygon in an index coverage corresponds to a tile.
An AML named scan24_proc1.aml was created for removing the map collar. The AML used the SJRWMD 1:24,000 quad index coverage to reselect polygons to clip the GRID format DRG.
The basic methodology is as follows: ...
The adjacent coverages are collected by the 'librarian' which works with an overall polygon index coverage and a record pointing to the tiles physical location. This implementation in some aspects hinders to handle the layers as a whole.
 See also: Image, Boundary, ESRI, Conversion, Digital
  
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