[GRASS5] Re: [Bug 834] cs2cs: grid file causes first coord to bork
hamish_nospam at yahoo.com
Wed Apr 20 19:52:02 EDT 2005
[v.in.garmin with datum grid file fails to do datum transform]
> ------- It appears that the following occurs if the nzgd2kgrid005.gsb
> file isn't being found.
note the file name is nzgd2kgrid0005.gsb, with three "0"s.
> So, in a sense the bug isn't that the first point fails, but that the
> subsequent points succeed.
> I'm going to make a second pass on this a bit later to dig into why
> after the first failure, points start succeeding (presumably without
> actually applying a transform).
Yes, having a closer look in the track data it is off by 175m. akk.
As far as the GRASS 6 v.in.garmin module goes, this error breaks
downloading waypoints but silently puts the downloaded track data in the
wrong place. :/ I'll add a check so that case breaks too.
> In the meantime, Hamish, you should ensure that you have the grid file
> somewhere appropriate such as in /usr/local/share/proj or you have
> the PROJ_LIB environment variable pointing somewhere the file can be
It is where GRASS installed it, ie $GISBASE/etc/nad/nzgd2kgrid0005.gsb,
or where it lives in the GRASS source tree, lib/proj/nzgd2kgrid0005.gsb.
I take it that PROJ_LIB needs to be set at *PROJ4's* compile time?
But how to deal with the fact that GRASS supplies the grid after the
fact? Setting PROJ_LIB="$GISBASE/etc/nad" at run time does not fix it
The Debian package, e.g., can place the file or a link to it in
/usr/share/proj/ (and that fixes the problem), but that doesn't solve
the common issue; it would be nice if GRASS could set something so
add-on grids could be used which are not supplied by the distribution's
Things work fine with the grid if you use GRASS's internal proj
functions, it is just cs2cs that fails.
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