[mapserver-users] Mapserver URL request layer

[Jörg Thomsen (WhereGroup)]

Hello Sander,

>  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?
>
the wms_ / wfs_ / ows_ / oga_ (coming in MapServer 8) Metadata-entry are 
aiming on your output. So, if you only want to serve wms, you only need 
the wms_*.
wfs_* conigures your WFS-server. If you want to serv wms and wfs and the 
parameters are the same, you can use ows_ instead.
>
>  1. 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?
>
No cache by default. MapServer requests the data source every time 
mapserver gets itself a getmap or get feature info request (or 
getfeature when serving wfs). So your WMS serves the actual data any 
time. If you want a cache, you have to configure mapcache or mapproxy 
separately.

>  1. Am I missing something else from the Metadata that I should consider?
>
I don't see anything missing

Jörg

Am 09.02.22 um 10:26 schrieb Sander Pukk:
> 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
>
> _______________________________________________
> MapServer-users mailing list
> MapServer-users at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/mapserver-users


-- 
Viele Grüße,
Jörg Thomsen

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