Thanks much Glynn. This is helpful. There is no urgency on the
parameters without descriptions right now since nothing seems to use
these, but we can't use them in the future without some kind of
description to parse.
Michael
On Oct 14, 2009, at 6:22 AM, Glynn Clements wrote:
Michael Barton wrote:
I'm working on the GUI location manager and have run into a couple of
irregularities in a couple of the projections parameters files. I'm
sending this to the list instead of keeping it in the location wizard
track ticket because they are a more general issue that will affect
projection/location creation by other means too.
In proj-parms.table, the entry for "GEOS" is incorrect. There should
be 3 subentries for each entry: projection code, projection
description, and required parameters. However, GEOS is missing the
projection description.
GEOS:HEIGH=ask,35800000.0;LON0=ask,20.0
Well caught.
GEOS is the only incorrect formatted entry in the file. It also is
NOT
in the datums.table file. So either it should be:
1) deleted from proj-parms.table, or
2) added to datums.table and a descriptive field added in proj-
parms.table
Because it cannot be correctly parsed, I'll just skip it in the GUI
location wizard. But if we are going to use this projection, it needs
to be corrected in the 2 tables.
The history behind that entry:
http://lists.osgeo.org/pipermail/grass-dev/2006-December/028324.html
http://trac.osgeo.org/grass/changeset/22186
IOW, it should probably be there, but should have the right number of
fields (ideally an actual description, but an empty description is
better than invalid syntax).
[I see that this has now been done.]
Also, in the proj-desc.table, several entries are incorrectly
formatted. None of them are used by the proj-parms.table and so they
probably should be removed from the proj-desc.table file. All are
missing their description fields that are needed so that they can be
read by a user. They are:
GUAM:bool:guam:
OALPHA:lat:o_alpha:
OLAT1:lat:o_lat_1:
OLAT2:lat:o_lat_2:
OLON1:lon:o_lon_1:
OLON2:lon:o_lon_2:
OLONC:lon:o_lon_c:
These are correctly formatted; they just have an empty description.
I removed the data from the g.setproj source code and placed it in
external files. Any descriptions (or lack of them) are as found in the
original g.setproj source code.
If you want to add descriptions, you'll need to examine the PROJ
source code. However, some parameters may have entirely different
meanings for different projections.
--
Glynn Clements <[email protected]>
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