Hi Javier,
Having a look at proj.db, I have seen a column in the table
"grid_alternatives" called "open_license"
What is the purpose of this field? (apart from allowing a meaningless
"url")
I guess it is not effectively used in the code.
It is reported as a metadata information in
proj_grid_get_info_from_database(), so users can make an informed
choice. It is used only for the following 2 grids which are publicly
available but whose license terms are not considered open data:
('naptrans2008.gtx','','naptrans2008.gtx','GTX','geoid_like',0,NULL,'https://salsa.debian.org/debian-gis-team/proj-rdnap/raw/upstream/2008/naptrans2008.gtx',1,0,NULL),
('rdtrans2008.gsb','','rdtrans2008.gsb','NTv2','hgridshift',0,NULL,'https://salsa.debian.org/debian-gis-team/proj-rdnap/raw/upstream/2008/rdtrans2008.gsb',1,0,NULL),
('netherlands/rdtrans2008','','rdtrans2008.gsb','NTv2','hgridshift',0,NULL,'https://salsa.debian.org/debian-gis-team/proj-rdnap/raw/upstream/2008/rdtrans2008.gsb',1,0,NULL),
The three entries with this field to "0" are a bit redundant, right?
No I don't think so. There are 2 different grids. And the rdtrans2008
one has a different name if it is used by EPSG records or ESRI records,
hence 2 records for it as original_grid_name is the key.
"original_grid_name" and "old_proj_grid_name" are the same. Are those
entries needed?
There are tons of records where they are different like:
INSERT INTO grid_alternatives(original_grid_name,
proj_grid_name,
old_proj_grid_name,
proj_grid_format,
proj_method,
inverse_direction,
package_name,
url, direct_download, open_license,
directory)
VALUES ('conus.las',
'us_noaa_conus.tif',
'conus',
'GTiff',
'hgridshift',
0,
NULL,
'https://cdn.proj.org/us_noaa_conus.tif', 1, 1, NULL);
old_proj_grid_name corresponds to known grid names by PROJ before PROJ 7
and the migration to GeoTIFF, so NTv2, CTable2 and GTX files
original_grid_name corresponds to the """"official"""" name in the
registry imported by PROJ, so most of the time the one used by EPSG (and
a few ones from ESRI or IGNF)
Even
--
http://www.spatialys.com
My software is free, but my time generally not.
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