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What version of ANUDEM does the Topogrid command in ArcInfo Workstation use?
TOPOGRID uses ANUDEM 4.5. for ArcInfo 7.2.1. For more information on TOPOGRID, refer to the online help. For specific information on ANUDEM, refer to the references listed in the online help.
The Topo To Raster tool in the ArcGIS 9.0 is based on ANUDEM 4.6.3. Topo To Raster is the ArcGIS 9.x implementation of TOPOGRID from ArcInfo Workstation.