I have finally come around to looking at this issue again... On Mon, May 26, 2008 05:01, Hamish wrote: > Moritz Lennert: > strictly speaking the "projection" (lcc) is there and fine, but (AFAIU) > the datum transform params for a given datum are left out if there are > more than one option in the upstream EPSG database. But the +datum= name > should still be given in that case. > > but I think that is a misdirection: in this case I think QGIS's srs.db is > broken, missing *all* datum info not just the ambiguos transform params. > The issue Frank raises still applies, but I do not think it is the main > problem here. >
[...] >> However both of the projections _are_ in the database and >> QGIS recognizes them. > > but they are incomplete! compare the entry for epsg:31370 in > /usr/share/proj/epsg and in /usr/share/qgis/resources/srs.sb (using > sqlitebrowser or such). you will see the srs.db version is missing the > +towgs84= part. (epsg:31370 is srs:1817 there, or just go to the layers > proj properties in QGIS and look) I have been able to solve the problem in QGIS by creating a custom projection including the transform info (copy-paste of the g.proj -jf output, replacing +a and +rf with the relevant +ellps). Now the result looks fine. > > > Could you could create/find the gvSIG report? > Actually, after further investigation, I found that gvSIG allows for transformations. When you load a file, you can give its projection info. See [1]. Notice the option to choose a transformation at the bottom (in this case I chose the EPSG list). You then have a series of choices of transformations [2]. Or you can chose to go for manual and enter the transformation parameters yourself [3]. So it's finally only QGIS which has the problem and you can sail around it by creating a custom projection containing the transformation info. Moritz [1] http://geog-pc40.ulb.ac.be/grass/misc/transformation_gvSIG_1.png [2] http://geog-pc40.ulb.ac.be/grass/misc/transformation_gvSIG_2.png [3] http://geog-pc40.ulb.ac.be/grass/misc/transformation_gvSIG_3.png _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
