Some more info:
According to /usr/share/doc/proj/README.Debian, "The Debian proj
package includes built-in datum conversion. (It was compiled with
proj-datumgrid-1.3.zip unpacked in the nad source directory.)"
According to the proj.4 FAQ (http://trac.osgeo.org/proj/wiki/FAQ):
"Verify that you have the binary files (eg.
/usr/local/share/proj/conus) installed on your system."
It seems that the package does not include /usr/local/share/proj/conus,
according to "dpkg -L proj", though it does have some other files there.
Also from the FAQ, there's a PROJ_DEBUG environment variable. Setting
this I get:
$ cs2cs +proj=latlong +datum=NAD27 +to +proj=latlong +datum=NAD83
pj_open_lib(proj_def.dat): call fopen(/usr/share/proj/proj_def.dat) - succeeded
pj_open_lib(proj_def.dat): call fopen(/usr/share/proj/proj_def.dat) - succeeded
-117 30
pj_open_lib(conus): call fopen(/usr/share/proj/conus) - failed
pj_open_lib(alaska): call fopen(/usr/share/proj/alaska) - failed
pj_open_lib(ntv2_0.gsb): call fopen(/usr/share/proj/ntv2_0.gsb) - failed
pj_open_lib(ntv1_can.dat): call fopen(/usr/share/proj/ntv1_can.dat) - failed
117dW 30dN 0.000
So it does seem that it's the absence of this /usr/share/proj/conus
file that's the problem. Has it been accidentally omitted from the
build, perhaps?
I also consider the fact that the program silently continues and prints
a wrong answer when it has detected that the file is missing to be a bug.
Phil.
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