It's interesting to note that, if I set a label, like the name of the object
("tittel"), it's always correct. It's only the getFeatureInfo that is wrong.
Also, I've tried to create a cluster layer from another dataset, where the main
different is, I believe, that the projection is different, and I don't have the
same problem there. Using the same cluster settings.
Fra: MapServer-users
<[email protected]<mailto:[email protected]>>
På vegne av Guldberg, Erik via MapServer-users
Sendt: fredag 14. februar 2025 14:51
Til: [email protected]<mailto:[email protected]>
Emne: [MapServer-users] Wrong and inconsistent GetFeatureInfo result for
CLUSTER layer
Hi,
I have a WMS service, https://kart.ra.no/wms/brukerminner, where I have
problems getting correct getFeatureInfo results from a layer with CLUSTER
content.
It contains the cluster layer and a regular point layer for the same data. The
regular point layer is shown at 1:50 000.
For single objects in both the cluster layer, I want to be able to use
getFeatureInfo. This works, but the problem is that the results most of the
time are wrong, and that they change for time to time, likely due to change in
zoom level. For the regular point layer, the result is always correct. I've
also created a test cluster layer without the scale limit, and that also gives
the correct result if I zoom in enough.
All the symbols are placed correctly in the map, for all layers. I've used the
database, and also this OGC API service (that uses the same data source as the
WMS) as a reference: https://api.ra.no/brukerminner
I'm using MapServer version 7.6.4.
Some example queries, using QGIS.
Wrong result. The object I get in the getfeatureinfo is 64 km away from where I
clicked.
https://kart.ra.no/wms/brukerminner?language=nor&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetFeatureInfo&BBOX=760392.02671199827454984%2C8263040.88853696268051863%2C1033357.36004533339291811%2C8407916.1385369636118412&CRS=EPSG%3A3857&WIDTH=1984&HEIGHT=1053&LAYERS=Brukerminner&STYLES=&FORMAT=image%2Fpng&QUERY_LAYERS=Brukerminner&INFO_FORMAT=text%2Fhtml&I=1069&J=616&FEATURE_COUNT=10
Zoomed in a bit more gives another, wrong result. This is 8.7 km away from
where I clicked:
https://kart.ra.no/wms/brukerminner?language=nor&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetFeatureInfo&BBOX=871972.11004533257801086%2C8307721.07603696547448635%2C940213.44337866583373398%2C8343939.88853696547448635&CRS=EPSG%3A3857&WIDTH=1984&HEIGHT=1053&LAYERS=Brukerminner&STYLES=&FORMAT=image%2Fpng&QUERY_LAYERS=Brukerminner&INFO_FORMAT=text%2Fhtml&I=1022&J=627&FEATURE_COUNT=10
This is the Test-layer, how it looks now. I've tried different variations of
PROCESSING settings.
LAYER
NAME "TEST"
DEBUG 5
TYPE POINT
STATUS ON
TEMPLATE "../templates/brukerminner.html"
HEADER "../templates/header.html"
FOOTER "../templates/footer.html"
TOLERANCEUNITS pixels
TOLERANCE 25
# MINSCALEDENOM 50000
METADATA
"wms_enable_request" "*"
"wms_include_items" "tittel"
"wms_title" "TEST"
"wms_feature_info_mime_type" "text/html"
END
PROJECTION
"init=epsg:4326"
END
EXTENT -19.76 54.57 45.57 82.67 #4326
PROCESSING "CLOSE_CONNECTION=DEFER"
CONNECTIONTYPE POSTGIS
CONNECTION "host=host dbname=db user=user password=password port=5432"
DATA "geom from xx.xx using unique id using srid=4326"
LABELITEM "Cluster_FeatureCount"
# PROCESSING "CLUSTER_ALGORITHM=SIMPLE"
PROCESSING "CLUSTER_GET_ALL_SHAPES=ON"
PROCESSING
"ITEMS=tittel,beskrivelse,fylke,kommune,opprettet,endret,opprettet_av,linkkulturminnesok,gpsposisjon"
# PROCESSING "CLUSTER_KEEP_LOCATIONS=ON"
CLUSTER
MAXDISTANCE 50
REGION "ellipse"
END
CLASS
NAME "Brukerminne"
EXPRESSION ("[Cluster_FeatureCount]" = "1")
STYLE
SYMBOL "brukerminne"
COLOR 200 0 0
SIZE 27
OFFSET 0 -13.5
END
END
END
Anyone with ideas on what's wrong?
Thanks,
Erik
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