I have my initial work here:
https://github.com/ajolma/gdal/commit/2335bc6222e8d8df7e4b5fcfe21a825c727ad549
what I've done so far:
* Recognize WCS:URL format
* Parse GetCapabilities XML (versions 1.0.0 to 2.0.1)
* Simple cache for various XML-files (PAM, WCS_GDAL, Capabilities,
DescribeCoverage)
My goal is to support something like (1-3 work somehow, 3 only for 1.0.0
- for 1.1.1 it issues a too large GetCoverage request, maybe I broke
something(?))
1) gdalinfo WCS:URL-to-server
this fetches, parses and caches GetCapabilities XML
2) pick a layer from the list (DescribeCoverage URL is given)
3) gdalinfo WCS:DescribeCoverage-URL
4) use the layer
I'll work on at least basic support for 2.0.1 - time permitting.
Notes:
* No tests yet in the autotest suite
* I'm testing against existing ArcGIS, GeoServer and MapServer servers
on the net
* The namespace support in parsing XML may be a bit overkill, but anyway
its there.
* There are a few small utility functions - some could perhaps be
replaced by ones from port and some could perhaps be added there in some
form; and all could be improved.
Ari
Even Rouault kirjoitti 23.10.2017 klo 13:19:
Hi Ari,
It seems to me that the WCS driver could benefit from some love.
That would be a good initiative!
In the wished feature list, I could add:
* improve test coverage, which is really low currently:
https://rawgit.com/rouault/gdalautotest-coverage-results/master/coverage_html/frmts/wcs/wcsdataset.cpp.gcov.html
One issue we have for testing is the lack of stable & reliable servers.
One potential way of addressing this is to use a local HTTP server, like I did
recently with the /vsis3/ (and similar)
subsystems, where you can add stub endpoints. An extra advantage is that you
can also easily test error situations.
See
- example of server start and end
https://trac.osgeo.org/gdal/browser/trunk/autotest/gcore/vsis3.py#L126
https://trac.osgeo.org/gdal/browser/trunk/autotest/gcore/vsis3.py#L1906
- example of installation of HTTP answers to expected requests:
https://trac.osgeo.org/gdal/browser/trunk/autotest/gcore/vsis3.py#L1258
* WCS 2.0 support
Even
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