How to Extract Maps from Index Maps | Convert Old Maps to New Maps
An index map is a finding aid for a set of maps covering regions of interest along with a name or number of the relevant map sheet. It provides geospatial data on either a sheet of paper or a computer display, like a gazetteer, with the location represented within a grid overlaying the map's surface.
Maps that serve as indexes to a larger set of maps or as reference maps for finding specific locations within a broader area are often called "index maps." These maps typically provide an overview of the region or area of interest, with labeled grid sections or other indicators to help users locate specific features or regions. Index maps can be particularly useful for navigating larger sets of maps or for quickly finding specific locations within a geographic area.