Hi,
About ows_* from https://www.mapserver.org/ogc/wms_server.html
(Note that each of the metadata below can also be referred to as ‘ows_*’
instead of ‘wms_*’. MapServer tries the ‘wms_*’ metadata first, and if not
found it tries the corresponding ‘ows_*’ name. Using this reduces the amount of
duplication in mapfiles that support multiple OGC interfaces since “ows_*”
metadata can be used almost everywhere for common metadata items shared by
multiple OGC interfaces.)
-Jukka Rahkonen-
Lähettäjä: MapServer-users <mapserver-users-boun...@lists.osgeo.org> Puolesta
Sander Pukk
Lähetetty: keskiviikko 9. helmikuuta 2022 11.26
Vastaanottaja: Jason Snyder <mapserver-users@lists.osgeo.org>
Aihe: [mapserver-users] Mapserver URL request layer
Hi there!
Trying to use a geojson output from API directly in Mapserver layer.
Geojson is per standard, 4326, but my Mapserver and OL (the client) is
configured to 3301.
We have hundreds of layers (mostly from Postgres) at the same time and the
system works.
No other direct API ones.
The current MAP file's WEB part looks like this:
WEB
METADATA
"wfs_title" "title"
"wfs_enable_request" "*"
"wms_enable_request" "*"
"wfs_encoding" "UTF-8"
"wms_title" "title"
"wms_encoding" "UTF-8"
"wms_onlineresource"
"url/mapserv?map=/app/gis/infokihid/infolayers_other.map&"
"wfs_onlineresource"
"url/mapserv?map=/app/gis/infokihid/infolayers_other.map&"
"ows_srs" "EPSG:3301 EPSG:3857 EPSG:4326"
"ows_enable_request" "*"
"wfs_getfeature_formatlist" "gml,geojson"
"wms_feature_info_mime_type" "application/json,application/json;
subtype=geojson,application/vnd.ogc.gml,text/plain"
END
END
PROJECTION
"init=epsg:3301"
END
And the layer:
PROJECTION
"init=epsg:4326"
END
METADATA
"wfs_srs" "EPSG:3301"
"gml_msGeometry_type" "line"
#"ows_extent" "40500 5993000 1064500 7017000" copy paste lon and lat
from these 3301 coordinates from other layer's capabilites
"ows_extent" "14.9318705986602 53.7681633673032 35.1060366818735
63.2747817924556"
"wfs_extent" "14.9318705986602 53.7681633673032 35.1060366818735
63.2747817924556"
"wms_extent" "14.9318705986602 53.7681633673032 35.1060366818735
63.2747817924556"
"ows_title" "road_restrictions"
"ows_abstract" "road_restrictions"
"ows_keywordlist" "road_restrictions"
"ows_include_items" "all"
"gml_include_items" "all"
"ows_featureid" "id"
"gml_exclude_items" "edges,geometry"
"ows_exclude_items" "edges,geometry"
END
Couple of questions I have which I didnt really find answers for:
1. Had issues with 4326 to 3301 transformation,the extent and all that.
(OpenLayers could manage but QGIS couldnt). Previously only had ows_extent.
Is ows_extent even a thing? This only shows wms_extent
https://mapserver.org/ogc/wms_server.html#layer-object-metadata
Should you use wfs_extent and wms_extent instead?
2. My layer is doing an OGR connection directly to the API URL. Works fine.
My question is, the API renews itself every 2 minutes (new data).
How does Mapserver handle the request with that connection? I move the map
(openlayers), there's a new Mapserver request - does Mapserver make a new
request to the API endpoint and get a new json?
Or is there some sort of cache?
3. Am I missing something else from the Metadata that I should consider?
With kind regards,
Sander
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