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| The GREMOVE Procedure |
Overview
The GREMOVE procedure processes a map data set that is used as input. It does not produce any graphics output. Instead, it produces an output data set that typically becomes the input map data set for the GMAP procedure (see The GMAP Procedure). The GREMOVE procedure combines unit areas defined in a map data set into larger unit areas by removing shared borders between the original unit areas. For example, Map before Removing Borders (GRMUSMAP(a)) and Map after Removing Borders (GRMUSMAP(b)) show combined unit areas in a typical map data set by removing state boundaries to create regional census divisions.
Map before Removing Borders (GRMUSMAP(a))
![[Map before Removing Borders (GRMUSMAP(a))]](images/grmusmapa.gif)
Map after Removing Borders (GRMUSMAP(b))
![[Map after Removing Borders (GRMUSMAP(b))]](images/grmusmapb.gif)
The program for these maps is shown in Removing State Boundaries from U.S. Map.
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