[GIS] How to define a bounding box within a WFS-request

mapinfoqgisqgis-2web servicewfs

I need to get some data from via a WFS connection but due to the sheer size of the data, it takes for ever to load into Qgis or MapInfo.

MapInfo has a feature which allows you to restrict the wfs request to 'current mapper' and only get the data the are visible in the current window.

I know, that I am supposed to be able to define the Bounding box withing the WFS-url, but I can't get that working.

Is there anyone out there that knows how to do that?

I hope I made myself clear 🙂

Best Answer

For WFS requests with BBOX you need minimum MapInfo v11.5.2 and your WFS service needs to be v1.1.0

Open new mapper window and zoom in area of interest (this would be approx. bbox coordinates)
Open Web Service/Open WFS...
Choose your server
Now you're in Open WFS Table window. Choose a table.
Click on Row Filter... in Data Filters section of that window
Now you're in Row Picker window. Choose your column that represent geometry objects (SP_GEOMETRY for example). After that you will get a list of operators and choose ogc:BBOX. Value will be CURRENT_MAPPER which is what we want , OK ? If you have selected some polygon feature in a first step, you will also have SELECTION as a value (then BBOX is calculated from selected polygon).

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After this all you need is to do few OK's and that is it.

Also please note that WFS service could be limited (for example: maximum number of features returned is 500).

Related Solutions

[GIS] Defining bounding box within Add WFS Layer dialog of QGIS

Here's an example that calls for Ordnance Survey OpenData Vectors:

http://www.osmgb.org.uk/ogc/wfs-vmd?SERVICE=WFS&REQUEST=GetFeature&TYPENAME=OS-VMD:road&SRSNAME=EPSG:27700&BBOX=447901.707808,337571.014355,453015.418400,341833.260141

Leaflet WFS – How to Add a Bounding Box Filter to a Leaflet WFS Request

I would recommend to set a min zoom where you start loading the wfs. Then listen to the move-event of the map and grab the current-extent to make this extent part of the GetFeature-Request:

working jsfiddle here: http://jsfiddle.net/expedio/n5rsdhha/

( or fullscreen: http://jsfiddle.net/expedio/n5rsdhha/embedded/result/ ... here the start-zoom could perhaps be even higher)

and important javascript-part here:

var start_at_zoom = 8;

function onEachFeature(feature, layer) {
    // does this feature have a property named dz?
    if (feature.properties && feature.properties.dz) {
        layer.bindPopup(feature.properties.dz);
    }
}

var featureLayer = new L.GeoJSON(
    null, {
        onEachFeature: onEachFeature
    }).addTo(map);
load_wfs();

function loadGeoJson(data) {
    // console.log(data);
    featureLayer.clearLayers();

    featureLayer.addData(data);

}

map.on('moveend', load_wfs);

function load_wfs() {
    if (map.getZoom() > start_at_zoom) {
        var geoJsonUrl = 'http://map.kecoviewer.com/geoserver/wfs';
        var defaultParameters = {
            service: 'WFS',
            version: '1.0.0',
            request: 'getFeature',
            typeName: 'cresh:datazones_popup_mini',
            maxFeatures: 3000,
            outputFormat: 'text/javascript',
            format_options: 'callback: getJson',
            srsName: 'EPSG:4326'
        };




        var customParams = {
            bbox: map.getBounds().toBBoxString()
        };
        var parameters = L.Util.extend(defaultParameters, customParams);
        console.log(geoJsonUrl + L.Util.getParamString(parameters));


        $.ajax({
            jsonp: false,
            url: geoJsonUrl + L.Util.getParamString(parameters),
            dataType: 'jsonp',
            jsonpCallback: 'getJson',
            success: loadGeoJson
        });

    } else {
        alert("please zoom in to see the polygons!");
        featureLayer.clearLayers();
    }
}

Best Answer

Related Solutions

[GIS] Defining bounding box within Add WFS Layer dialog of QGIS

Leaflet WFS – How to Add a Bounding Box Filter to a Leaflet WFS Request

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