[Freegis-list] dwg, dxf how to know reference system

[robert fritz]

Hello,

there is a difference between plain AutoCAD and Autodesk Map or Autodesk CIVIL. Both products base on AutoCAD but offer additional functionalty for GIS-staff and civil engineers. In Autodesk Map / Civil drawings can have an coordinate system and there are functions for transformation of coordinates, e.g. while importing esri Shape files. If you have dwg/dxf files maybe the best way to transfer the data to gis-data is to use Autodesk Map or Civil (maybe an evaluation copy which runs 30 days). You can import and export in different formats e.g. esri shapefile. In the current version of Map/Civil (2007) you can copy your drawings to MySQL via fdo (see: https://fdo.osgeo.org/)
There is another tool for Autodesk Map (Version 2005!) whichs allows the transfer of drawings (or some of the content) to PostGIS, see: http://www.agentur-geoinfo.de/acadmap2pgsql.htm. It's free.

Regards,
Robert


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