Lars,
I was testing using master versions of GDAL and Mapserver, but this
should also applied to not-too-ancient released versions.
When using the OGR WFS driver, you'll never see a perfect forwarding of
the BBOX from the client request to the backend WFS. It will be
reprojected to an extent in the SRS that is seen by OGR.
Even
Le 08/06/2021 à 11:39, Lars Fricke a écrit :
Dear Even, dear all,
After being away from this for some days unfortunately I looked again
today and it seems my problem burns down to that I can not get
Mapserver to forward the BBOX making the call from my browser. I did
include Even's fix in the <URL> element in wfs-request-dop-bkg-age but
with no luck. @Even: What version are you using to get the results
you're getting with BBOX?
I did notice that there is no
<ows:Parametername="Sections">
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with
<ows:Value>Filter_Capabilities</ows:Value>
that I see in another .xml file for another server. I tried to
manually add that but with no success either so most likely it's not
the issue.
Thank you so much for your support.
Best
Lars
Am 28.05.21 um 14:32 schrieb Even Rouault:
Lars,
I believe the service you request doesn't implement WFS 1.1 properly.
Trying this
./mapserv
QUERY_STRING="map=wfs.map&SRSNAME=EPSG:3857&SERVICE=WFS&VERSION=1.1.0&REQUEST=GetFeature&BBOX=791880.72463009,6321925.37255709,792929.63787777,6322786.10157277&TYPENAME=TestLayer"
I see that GDAL does:
VSICURL: Start download for
http://sg.geodatenzentrum.de/wfs_info?SERVICE=WFS&VERSION=1.1.0&MAXFEATURES=500&REQUEST=GetFeature&TYPENAME=info:dop&FILTER=%3CFilter%20xmlns%3D%22http:%2F%2Fwww.opengis.net%2Fogc%22%20xmlns:gml%3D%22http:%2F%2Fwww.opengis.net%2Fgml%22%3E%3CBBOX%3E%3CPropertyName%3Egeom%3C%2FPropertyName%3E%3Cgml:Box%3E%3Cgml:coordinates%3E362792.2015953020309098,5459899.7109905285760760%20363491.4383923375280574,5460477.4964771848171949%3C%2Fgml:coordinates%3E%3C%2Fgml:Box%3E%3C%2FBBOX%3E%3C%2FFilter%3E
So Mapserver has transmitted to GDAL a BBOX filter in epsg:25832
(which is the native SRS of the layer) that is the reprojection of
your source BBOX from EPSG:3857. All things are good up to that point.
But the server returns an empty response.
Tweaking it manually to include a srsName="EPSG:25832" attribute in
gml:Box returns a response with 2 features
http://sg.geodatenzentrum.de/wfs_info?SERVICE=WFS&VERSION=1.1.0&MAXFEATURES=500&REQUEST=GetFeature&TYPENAME=info:dop&FILTER=%3CFilter%20xmlns%3D%22http:%2F%2Fwww.opengis.net%2Fogc%22%20xmlns:gml%3D%22http:%2F%2Fwww.opengis.net%2Fgml%22%3E%3CBBOX%3E%3CPropertyName%3Egeom%3C%2FPropertyName%3E%3Cgml:Box%20srsName=%22EPSG:25832%22%3E%3Cgml:coordinates%3E362792.2015953020309098,5459899.7109905285760760%20363491.4383923375280574,5460477.4964771848171949%3C%2Fgml:coordinates%3E%3C%2Fgml:Box%3E%3C%2FBBOX%3E%3C%2FFilter%3E
But we shouldn't have to do this has a missing srsName should be
interpretated as the defaultSRS according to my understand of the WFS
1.1 spec
You can however tweak the <URL> element in wfs-request-dop-bkg-age
and add "&SRSNAME=EPSG:25832" to it (since it is the defaultSRS
of all the layers of the service), and then GDAL will forward it.
Even
Le 28/05/2021 à 14:11, Lars Fricke a écrit :
No problem. Unfortunately, testing native WFS did not work because
it does not properly support cascading wfs with different srs (see
my other post).
Thanks for looking into this.
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Am 28.05.21 um 13:55 schrieb Even Rouault:
oops, sorry, didn't notice 😅
Le 28/05/2021 à 13:52, Lars Fricke a écrit :
I put in the files as attach. Is that filtered?
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Am 28.05.21 um 13:43 schrieb Even Rouault:
Please include your mapfile and the wfs-request-testlayer.xml
file to reproduce. I'm confused by the mapfile you posted
yesterday that uses epsg:25832 and the fact that GDAL through
mapserver would issue a GetFeature in EPSG:3857 as suggested
below. I can't see how that could happen (given the
MapServer/GDAL integration, GDAL should always request in the
native SRS of the layer and MapServer will do the reprojection to
the SRSNAME of the WFS request)
But as Daniel suggested using the CONNECTION WFS is probably a
better way of doing what you want
Le 28/05/2021 à 13:13, Lars Fricke via mapserver-users a écrit :
So here is the working not working setup. Unfortunately the
working OGR WFS client layers are all private so I can not share
them.
This call delivers objects as expected:
http://localhost:8181/cgi-bin/mapserv?map=/var/www/html/wfs.map&SRSNAME=EPSG:3857&SERVICE=WFS&VERSION=1.1.0&REQUEST=GetFeature&Maxfeatures=10&TYPENAME=TestLayer
This one, too:
http://localhost:8181/cgi-bin/mapserv?map=/var/www/html/wfs.map&SRSNAME=EPSG:3857&SERVICE=WFS&VERSION=1.1.0&REQUEST=GetFeature&Maxfeatures=10&TYPENAME=TestLayer
Data is delivered in the correct srs (verified manually with QGIS).
This call doesn't work as described before as BBOX is not
transmitted to external server:
http://localhost:8181/cgi-bin/mapserv?map=/var/www/html/wfs.map&SRSNAME=EPSG:3857&SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&BBOX=791880.72463009,6321925.37255709,792929.63787777,6322786.10157277&TYPENAME=TestLayer
While the same direct call works:
http://sg.geodatenzentrum.de/wfs_info?SRSNAME=EPSG:3857&SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&BBOX=791880.72463009,6321925.37255709,792929.63787777,6322786.10157277&TYPENAME=info:dop
(funny, epsg 3857 is not in the capabilities but works anyhow)
I hope you can find out what is going wrong. Thanks so much for
looking into this!
Best
Lars
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Am 27.05.21 um 18:28 schrieb Rahkonen Jukka (MML):
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Hi,
Have you already tried to use WFS connection instead of OGR
connection?
-Jukka Rahkonen-
*Lähettäjä:* mapserver-users
<[email protected]> *Puolesta *Lars Fricke
*Lähetetty:* torstai 27. toukokuuta 2021 14.59
*Vastaanottaja:* [email protected]
*Aihe:* Re: [mapserver-users] WFS Client returns data at random
with very same call
Dear all,
I apologize for finding and posting bits and pieces not all at
one time.
I fired up 'CONFIG "CPL_DEBUG" "ON"' and there I see, that
"""
HTTP:
Fetch(http://url-to-external-server?SERVICE=WFS&VERSION=1.1.0&MAXFEATURES=1000&REQUEST=GetFeature&TYPENAME=dop
<http://url-to-external-server?SERVICE=WFS&VERSION=1.1.0&MAXFEATURES=1000&REQUEST=GetFeature&TYPENAME=dop>)
"""
So there is no BBOX. On other layers I see
"""
GDALOpen(/vsicurl_streaming/https:...
"""
with BBOX.
No wonder I do not get reliable results if the server is
calling some 1000 whatsoever result objects and starts
filtering the bbox after.
Any idea what is happening? Or is this something for a GDAL thread?
Best
Lars
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My software is free, but my time generally not.
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