Hi,
MS4W 5.0.0 RC1 contains GDAL version that does not include this enhancement
https://github.com/OSGeo/gdal/issues/8522.
It means that my Mapserver was reading OGCFeat only 10 features at a time. That
gives all too bad impression about the speed of the OGCFeat source. The VRT
below works also with older GDAL versions, it is reading a thousand times
bigger pages, it is faster, and it does not bloat our server logs. A hint for
debuggers: the document
https://mapserver.org/optimization/debugging.html#table-of-contentseven is not
totally accurate. Even when MS_ERRORFILE is set, some debug data, including the
outgoing http requests, go to the Apache error_log.
<OGRVRTDataSource>
<OGRVRTLayer name="building">
<SrcDataSource>OAPIF:https://beta-paikkatieto.maanmittauslaitos.fi/inspire-buildings/features/v1/</SrcDataSource>
<SrcLayer>building</SrcLayer>
<OpenOptions>
<OOI key="PAGE_SIZE">10000</OOI>
</OpenOptions>
</OGRVRTLayer>
</OGRVRTDataSource>
-Jukka Rahkonen-
Lähettäjä: MapServer-users <[email protected]> Puolesta
Rahkonen Jukka via MapServer-users
Lähetetty: tiistai 14. marraskuuta 2023 10.09
Vastaanottaja: Richard Greenwood <[email protected]>
Kopio: Mapserver-Users ([email protected])
<[email protected]>
Aihe: Re: [MapServer-users] How to cascade data from OGC API Features service?
Hi,
Oh yes, it was a typo. As a user who tries to be standard compliant I had
upgraded the name in one place to match with the OGC approved abbreviation
“OGCFeat” instead of the GDAL driver name “OAPIF”.
The MAXSCALEDENOM value 60000 (naturally copy-pasted from some old mapfile) is
all too large for that service in areas with lots of buildings. Scale 1:5000 is
probably safe everywhere. A EPSG:3067 bbox for testing:
BBOX=390723,6671479,392177,6672231
Positive thing is that now also other Mapserver users know that it is possible
to use OGCFeat services as source data with OGR connection. Thanks to you and
TC Haddad who also found the typo.
-Jukka Rahkonen-
Lähettäjä: Richard Greenwood
<[email protected]<mailto:[email protected]>>
Lähetetty: tiistai 14. marraskuuta 2023 5.38
Vastaanottaja: Rahkonen Jukka
<[email protected]<mailto:[email protected]>>
Kopio: Mapserver-Users
([email protected]<mailto:[email protected]>)
<[email protected]<mailto:[email protected]>>
Aihe: Re: [MapServer-users] How to cascade data from OGC API Features service?
Are you sure that you don't just have a typo? Your file is named "ogcfeat.vrt"
but your CONNECTION "c:/ms4w_data/oapif.vrt"
I set up a quick test and I haven't gotten a map (it timed out 504 error after
several minutes) but I didn't get an error. Maybe you could share a smaller
test data set and a reasonable bounding box. My test:
http://localhost/cgi-bin/mapserv?map=MAP_TEST&REQUEST=GetMap&SERVICE=WMS&VERSION=1.3.0&LAYERS=building&WIDTH=696&HEIGHT=870&CRS=EPSG:3067&BBOX=-359700,6615190,-359500,6615199&FORMAT=png
On Mon, Nov 13, 2023 at 2:48 PM Rahkonen Jukka via MapServer-users
<[email protected]<mailto:[email protected]>> wrote:
Hi,
I tried to make a WMS layer from OGC API Features service but I did not
success. This is my best trial so far:
I am using Mapserver from MS4W 5.0.0 RC1
I wrote this ORG VRT file (ogcfeat.vrt)
<OGRVRTDataSource>
<OGRVRTLayer name="building">
<SrcDataSource>OAPIF:https://beta-paikkatieto.maanmittauslaitos.fi/inspire-buildings/features/v1/</SrcDataSource>
<SrcLayer>building</SrcLayer>
</OGRVRTLayer>
</OGRVRTDataSource>
The GDAL included in MS4W reads the vrt OK with
ogrinfo ogcfeat.vrt -al -so --debug on
(there are 5 millions polygons so hit Ctrl-C if you are just testing)
I wrote a layer that can be at the bottom of this message below. The WMS
GetCapabilities show the new layer but GetMaps fail. The log file collects
these errors
msDrawMap(): Image handling error. Failed to draw layer named 'building'.
msOGRFileOpen(): OGR error. Open failed for OGR connection in layer `building'.
File not found or unsupported format. Check server logs.
Open failed for OGR connection in layer `building'.
Am I missing something from my configuration? My LAYER is like this
LAYER
NAME "building"
STATUS ON
CONNECTIONTYPE OGR
CONNECTION "c:/ms4w_data/oapif.vrt"
DATA "building"
TYPE POLYGON
# DEBUG 5
UNITS METERS
SIZEUNITS PIXELS
MAXSCALEDENOM 60000
TOLERANCE 3
TOLERANCEUNITS PIXELS
METADATA
"wms_title" "OGCFeat-building"
"wms_include_items" "all"
END #metadata
PROJECTION
"init=epsg:3067" ##recommended
END
CLASS
NAME "building"
STYLE
COLOR 200 255 200
OUTLINECOLOR 120 120 120
END # Style
END # Class
TEMPLATE "empty" ##recommended (enable GetFeatureInfo / can point to valid
.html template)
END # Layer
-Jukka Rahkonen-
_______________________________________________
MapServer-users mailing list
[email protected]<mailto:[email protected]>
https://lists.osgeo.org/mailman/listinfo/mapserver-users
--
Richard W. Greenwood
www.greenwoodmap.com<http://www.greenwoodmap.com/>
_______________________________________________
MapServer-users mailing list
[email protected]
https://lists.osgeo.org/mailman/listinfo/mapserver-users
