John
New proj now adds support for geotiffs for datums, much smaller and can be
accessed over net, subset, etc. There is a CDN for the data, cdn.prog.org as
well as a utility for fetching data, https://proj.org/apps/projsync.html.
You can use the online CDN to just fetch what a user needs at runtime and never
download, or you can download ahead of time, whatever subsets you need.
Mike
--
Michael Smith
US Army Corps of Engineers
Remote Sensing/GIS Center
On 8/19/20, 5:05 PM, "gdal-dev on behalf of John Daniel"
<gdal-dev-boun...@lists.osgeo.org on behalf of jdan...@etresoft.com> wrote:
Hello,
The old proj-datumgrid is divided into a small, 13 MB required dataset and
a number of much larger optional regional datasets. The new proj-data doesn't
seem to have this distinction. It is smaller overall, but still 500 MB.
I am interested in using GDAL in mobile apps so I don't want to include
that much data. Is there a smaller set of proj-data files that can be used
instead? Which of those files are required and which can be omitted? For
example, it is possible to split the data by region, but with the software work
with only a partial set of files? Can the data files be downloaded at runtime,
on demand? If so, I'm sure I will need to include a few of them by default.
It looks like PROJ 7 can still be used with the old data. Is PROJ 7 safe
for use with other projects? I have seen some messages that suggested that this
was a problem for some projects. I think Spatialite was one. I won't be
distributing with GPL projects like GEOS or Spatialite, but I would still like
to use them for local testing.
Thanks.
John Daniel
Etresoft, Inc.
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