Paul,
Thanks for looking into this. I'll get back to you, hopefully this week.
Best,
Maciek
W dniu 16.05.2010 21:18, Paul Kelly pisze:
Hi Maciej, Markus,
On Sat, 15 May 2010, Markus Neteler wrote:
On Sat, May 15, 2010 at 2:53 PM, Maciej Sieczka <msiec...@sieczka.org>
wrote:
OK now, so this was actually a revert of a massive update which broke
things.
Right - personally, I find it to be a major problem that we are out of
synch with GDAL now.
I agree it's rather unfortunate. But I think we would be getting a lot
more complaints and bug reports if we had kept in-sync; the way GDAL now
handles datum transformation parameters by forcing a default choice just
isn't very desirable for the case of a user setting up a new location.
Having a potentially non-optimal choice being automatically made for
them could come back to haunt them in the future, perhaps even years
into the future.
Anyway, my point is that gcs.csv as it is now in all GRASS SVN branches
lacks towgs84 definition for Pulkovo 1942(58) datum, which results in
locations created from EPSG codes [4] lacking it too. The towgs84 should
be as in [5].
@Markus, Paul
Do I simply modify gcs.csv alone or should this be a somewhat bigger
change?
GRASS already has the correct parameters for Poland. The problem is that
it doesn't recognise the datum name "Pulkovo_1942_58"; it is looking for
"Pulkovo_1942". I would recommend the patch below for working around
this problem. In 7.x I hope to change things around so we can try to
work with GDAL's new way of doing things, rather than trying to work
around it.
Does this sound acceptable for now - in particular are there any
differences between Pulkovo 1942 and Pulkovo 1942 (58) that are worth
worrying about?
Paul
Index: lib/proj/convert.c
===================================================================
--- lib/proj/convert.c (revision 42262)
+++ lib/proj/convert.c (working copy)
@@ -744,6 +744,8 @@
"Militar_Geographische_Institut",
"Potsdam_Datum_83",
"Deutsches_Hauptdreiecksnetz",
+ "Pulkovo_1942_58",
+ "Pulkovo_1942",
NULL
};
--
Maciej Sieczka
http://www.sieczka.org
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