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Within a QGIS-course I would like to tell a bit about the proj.4 parameters. However, I'm not sure about the "+no_defs" parameter. The proj.4 website (http://proj4.org/parameters.html#parameter-list) says:

+no_defs Don't use the /usr/share/proj/proj_def.dat defaults file

Can anyone explain me what this means? (What would it mean to use the /usr/share/proj/proj_def.dat defaults file?)

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Finally I found this thread, which answers the question for my needs:

The "no_defs" item ensures that no defaults are read from the defaults files. Sometimes they cause suprising problems.

http://lists.osgeo.org/pipermail/mapserver-users/2003-November/046863.html

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