SDC datasets display GCS_Assumed_Geographic_1 for the coordinate system


The geographic coordinate system is GCS_Assumed_Geographic_1 for the SDC datasets from ESRI Data & Maps 2004.


The .PRJ file for each SDC dataset from ESRI Data & Maps 2004 is named <filename>.sdc.prj. ArcGIS versions 8.2 and 8.3 expect the name of the prj file to be <filename>.prj.

Solution or Workaround

There are two solutions:

  • Edit the prj file name by removing the .sdc extension so the file is called <filename>.prj.
  • Update the software to ArcGIS 9.0.

Article ID:000007256

  • ArcMap 8 x
  • Legacy Products

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