Hi,
The count of features received with resulttype=results should match the count
in resulttype=hits. That also makes most sense for me because that way the
client can make a test and re-think and adjust the request before sending the
real GetFeature. However, often it would be useful to know also the total
count of features in the service but that is missing from the WFS standard. In
practice it means that for example GDAL when it reads the layer summary with
ogrinfo and -so switch http://www.gdal.org/ogrinfo.html through WFS driver
http://www.gdal.org/ogr/drv_wfs.html the utility actually reads the whole
feature type. Or tries to read, it may hit the server side maxfeatures
naturally.
-Jukka-
Jonathan Moules
Hi Jukka,
I see what the difference is after some testing. Using the exact same URL but
only changing the WFS version:
http://wppgeog3/geoserver/ows?service=wfs&version=2.0.0&request=getfeature&typename=Public_Data_DB:OS_ADDPOINT_WSHIRE&resulttype=hits
WFS 1.0.0 - 0 (wrong)
WFS 1.1.0 - 7500 (correct)
WFS 2.0.0 - 0 (wrong)
Looking in the spec, 1.0.0 doesn't seem to have "resulttype" (but Geoserver
tries anyway). It's in both 1.1.0 and 2.0.0 though.
So looks like a bug, reported as http://jira.codehaus.org/browse/GEOS-6145
=====
One thought - shouldn't resulttype=hits return the *actual* number of features
that satisfy the user-query, not the number that satisfy the query after
GeoServer has added the maxfeatures to it?
So if the limit is 7500, and my database contains 10,000,000, shouldn't it
return 10,000,000?
The specs don't say clearly one way of the other which it should be.
Cheers,
Jonathan
On 8 November 2013 15:13, Rahkonen Jukka
<[email protected]<mailto:[email protected]>> wrote:
Hi Jonathan,
This is another WFS but like this it should work
Client side maxfeatures=10, numberOfFeatures=10
http://hip.latuviitta.org/cgi-bin/tinyows?service=wfs&version=1.1.0&maxfeatures=10&request=getfeature&typename=lv:mtk_tos_viiva&resulttype=hits
No client side maxfeatures, numberOfFeatures=100000, probably the server side
limit
http://hip.latuviitta.org/cgi-bin/tinyows?service=wfs&version=1.1.0&max&request=getfeature&typename=lv:mtk_tos_viiva&resulttype=hits
-Jukka Rahkonen-
Jonathan Moules
Hi Jukka,
Ok. It just seems like the sort of thing that would be very important for the
client to know so it can tell the user "Server returned 1000 features but the
server will only ever return 1000 features at a time so this may not be the
entire dataset".
Testing your suggestion, whenever I do that I always get back the exact same:
<wfs:FeatureCollection
xmlns:OS_Rasters="http://www.warwickshire.gov.uk/os_rasters";
xmlns:ogc="http://www.opengis.net/ogc";
xmlns:Secure_Community="http://www.warwickshire.gov.uk/Secure_Community";
xmlns:OS_Vector="http://www.warwickshire.gov.uk/os_vector";
xmlns:wfs="http://www.opengis.net/wfs"; xmlns:ows="http://www.opengis.net/ows";
xmlns:xlink="http://www.w3.org/1999/xlink";
xmlns:Misc_Rasters="http://www.warwickshire.gov.uk/misc_rasters";
xmlns:gml="http://www.opengis.net/gml";
xmlns:Public_Data_DB="http://www.warwickshire.gov.uk/public_data_db";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; numberOfFeatures="0"
timeStamp="2013-11-08T14:55:55.783Z"
xsi:schemaLocation="http://www.opengis.net/wfs
http://schemas.opengis.net/wfs/1.1.0/wfs.xsd"/>
Note it's claimed 0 features. Despite the fact the request does return 7500
features (maximum). A bug? I've not used that before.
Cheers,
Jonathan
On 8 November 2013 14:34, Rahkonen Jukka
<[email protected]<mailto:[email protected]>> wrote:
Hi,
Not directly as far as I know, but by sending GetFeature without filters and
with resulttype=hits it should be possible to do a good guess.
-Jukka Rahkonen-
Jonathan Moules wrote:
Hi List,
Relatively simple question, is it possible to a client to discover what the
maximum number of results are that the GeoServer will return to a WFS request
if the user has set "Maximum number of features"?
It doesn't seem to be specified in the GetCapabilities explicitly. Closest I
can see is the WFS 2.0 "ows:Constraint name="CountDefault"
Does 1.0 have any way to find it out?
Thanks,
Jonathan
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