[mapserver-users] Mapserver URL request layer

[Rahkonen Jukka (MML)]

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-bounces at lists.osgeo.org> Puolesta Sander Pukk
Lähetetty: keskiviikko 9. helmikuuta 2022 11.26
Vastaanottaja: Jason Snyder <mapserver-users at 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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