6.2. Use MapServer as the WFS client

WFS can be added as a layer in MapServer. In this way, it is used as a WFS client.

Since WFS needs to transfer data over the network, it is best to use smaller amounts of data. The selection here is to use point feature data.

6.2.1. Writting way of MapFile

MAP
    IMAGETYPE "PNG"
    EXTENT -180 -90 180 90
    SIZE 600 300
    SHAPEPATH "/gdata"
    IMAGECOLOR 100 100 100
    WEB
        IMAGEPATH "/owg/ms_tmp/"
        IMAGEURL "/ms_tmp/"
        METADATA
            "wfs_title" "world country"
            "wfs_onlineresource" "http://webgis.pub/cgi-bin/mapserv?map=/owg/mft6.map"
            "wfs_srs" "EPSG:4326"
            "wfs_abstract" "This text describes your wfs service"
            "wfs_enable_request" "*"
            "wms_enable_request" "*"
            "ows_keywordlist" "world"
            "gml_include_items" "all"
        END
    END
    PROJECTION
        "init=epsg:4326"
    END
    SYMBOL
        NAME "circle"
        TYPE ELLIPSE
        FILLED TRUE
        POINTS
            10 10
        END
    END
    LAYER
        NAME "wcity_wfs"
        TYPE POINT
        OFFSITE 0 0 0
        STATUS ON
        CONNECTIONTYPE WFS
        CONNECTION "http://webgis.pub/cgi-bin/mapserv?map=/owg/mft2.map&"
        METADATA
            "wfs_version" "1.0.0"
            "wfs_srs" "EPSG:4326"
            "wfs_typename" "world-city"
            "wfs_request_method" "GET"
            "wfs_connectiontimeout" "60"
        END
        PROJECTION
            "init=epsg:4326"
        END
        CLASS
            NAME "cities"
            SYMBOL "circle"
            SIZE 6
            COLOR 255 255 0
        END
    END
    LAYER
        NAME "wcountry"
        DATA "wcountry.shp"
        STATUS OFF
        TYPE POLYGON
        CLASS
            NAME "The Upper Great Lakes States"
            STYLE
                COLOR 232 232 232
                OUTLINECOLOR 32 32 32
            END
        END
    END
END

6.2.2. Example effect

The effect is:

Note that the above graph is a traditional MapServer generated map. Defined by the WFS point layer in front, so it’s mostly occluded by polygons.