[Qgis-user] OAPIF does not honour the view extent

[Rahkonen Jukka]

Hi Even,

Both extent-spatial-bbox and numberMatched are optional in the OAPIF standard so good that they now got tested with our service 😉. I don’t know why we have not configured the extents, we could well use the fixed BBOX of Finland for most collections. Omitting numberMatched is intentional. You know how slow it can be to run “select count(*) from…” .

-Jukka Rahkonen-

Lähettäjä: Even Rouault <even.rouault at spatialys.com>
Lähetetty: perjantai 15. syyskuuta 2023 20.49
Vastaanottaja: Rahkonen Jukka <jukka.rahkonen at maanmittauslaitos.fi>; qgis-user at lists.osgeo.org
Aihe: Re: [Qgis-user] OAPIF does not honour the view extent


Jukka,

Fixed per https://github.com/qgis/QGIS/pull/54617 . The infinite items request came from when requesting the feature count.

The server returns sub-optimal content for QGIS usage:

- the collection metadata does not advertize a extent.spatial.bbox

- the /items answers don't include a "numberMatched" property that would help to get the feature count (QGIS emits a /items?limit=1 hoping that it returns numberMatched)

Even
Le 12/09/2023 à 17:01, Rahkonen Jukka via QGIS-User a écrit :
Hi,

I hoped that the OAPIF driver would honor the check box “Only request features overlapping the view extent” but at least in QGIS 3.32 that does not happen.

How to test:
- Set project into EPSG:4326
- Open the Debugging/development tools
- Zoom for example to lat-lon 63.189111,23.538514 and set scale into 1:5000
- Add collection “building” from an open OAPIF service https://beta-paikkatieto.maanmittauslaitos.fi/inspire-buildings/features/v1/. Use feature paging with page size 1000.
- Remove the layer from the project because otherwise QGIS continues downloading a few million building polygons
- Check the http requests

The http history shows that after a bunch of probing OAPIF requests QGIS sends plain &items= request without &bbox= and thus asks the server to send the whole collection. What QGIS does right is that it follows the next-links and continues downloading.

https://beta-paikkatieto.maanmittauslaitos.fi/inspire-buildings/features/v1/collections/building/items?limit=1000&crs=http://www.opengis.net/def/crs/EPSG/0/4326

I wonder if the view extent limit should work also for OAPIF or is a not-yet implemented feature?


-Jukka Rahkonen-



_______________________________________________

QGIS-User mailing list

QGIS-User at lists.osgeo.org<mailto:QGIS-User at lists.osgeo.org>

List info: https://lists.osgeo.org/mailman/listinfo/qgis-user

Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

--

http://www.spatialys.com<http://www.spatialys.com/>

My software is free, but my time generally not.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20230917/db596ad4/attachment.htm>