I was thinking that I > would use postgis, but I need to know if it will be possible to > simultaneously use ArcGIS and GRASS (depending on purpose and > preference) with one postgis back-end
I have not tested this, however, it seems to enable ArcGIS to communicate with postGIS. I saw a screenshot of ARC 9.3 connected to postGIS. ZigGIS version 3.0 is said to return to OSS. http://www.obtusesoft.com/ Mark
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