[mapserver-users] spatial filter DWITHIN unsucessful
Neelima Emmani
neelima.emmani at iictechnologies.com
Tue Mar 6 03:19:40 EST 2012
Hi All,
I am working with openlayers, mapserver and post gis. I am facing problem with spatial filter DWITHIN and not able to discover if it is problem with mapserver or not.
Details::::
Now,
I have google map as a base map and overlayed few point layers. Now, i want to do filtering with respect to the path that's drew on the map. For this path , i am using draw feature with OpenLayers.Handler.Path. Upto here it is working fine. I can draw a line. Now using the line geometry , i am giving a spatial filter DWITHIN with a distance of 2000 and also mentioned distanceUnits as 'm'. After i draw a line , the spatial filter for DWITHIN gets activated and the layer to be filtered is completely disappearing. Now what i found is, it is throwing a WFS exception as below -
msWFSGetFeature(): WFS server error. Invalid or Unsupported FILTER in GetFeature :
(<ogc:Filter xmlns:ogc="http://www.opengis.net/ogc"><ogc:And><ogc:DWithin><ogc:PropertyName>the_geom</ogc:PropertyName><gml:MultiLineString xmlns:gml="http://www.opengis.net/gml" srsName="EPSG:900913"><gml:lineStringMember><gml:LineString><gml:coordinates decimal="." cs="," ts=" ">-79.205932617188,32.309033345029 -79.458618164063,32.267239420261 -79.851379394531,32.144067753448 -78.255615234375,33.130344611623</gml:coordinates></gml:LineString></gml:lineStringMember></gml:MultiLineString><ogc:Distance units="m">200000</ogc:Distance></ogc:DWithin><ogc:BBOX><ogc:PropertyName>the_geom</ogc:PropertyName><gml:Box xmlns:gml="http://www.opengis.net/gml" srsName="EPSG:4326"><gml:coordinates decimal="." cs="," ts=" ">-84.100341796875,29.910254
244941 -73.114013671875,34.556260876457</gml:coordinates></gml:Box></ogc:BBOX></ogc:And></ogc:Filter>
And then I checked with get Capabilities , It is spatial filter DWITHIN capable. After that I checked by copying my WFS layer url along with filter properties as below -
http://localhost/cgi-bin/mapserv.exe?map=C:/ms4w/apps/openlayers-2.10/examples/us1gc09m-addline.map&SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&TYPENAME=us1gc09m&Filter=%3CFilter%3E%3CDWithin%3E%3CPropertyName%3Ethe_geom%3C/PropertyName%3E%3Cgml:Point%3E%3Cgml:coordinates%3E-80.22217%2031.07991%3C/gml:coordinates%3E%3C/gml:Point%3E%3CDistance%20units=%27m%27%3E100%3C/Distance%3E%3C/DWithin%3E%3C/Filter%3E
into a browser. With this, It works well. No exception is thrown and the query is done properly. So, now, i do not understand where is the problem lies.
Can any one tell me how to solve this. How to do Spatial filter DWITHIN. And is my approach right?
Below is my JS code ---
var map;
var spatialfilter;
function init() {
map = new OpenLayers.Map("map");
//GOOGLE MAP
var base = new OpenLayers.Layer.Google("Google Hybrid", {'type': G_HYBRID_MAP});
map.addLayer(base);
//CREATE WMS LAYER
var wms = new OpenLayers.Layer.WMS("wms", "http://localhost/cgi-bin/mapserv.exe?map=C:/ms4w/apps/openlayers-2.10/examples/xyz.map",
{layers: 'xyz'}, {isBaseLayer: false, visibility: false, opacity: 0.5, singleTile: true});
map.addLayer(wms);
//VECTOR LAYER FOR PANEL
var vlayer = new OpenLayers.Layer.Vector("vlayer");
map.addLayer(vlayer);
// CREATE WFSLAYERS
//style map for points
var styleMap = new OpenLayers.StyleMap(OpenLayers.Util.applyDefaults({fillColor: "CYAN", fillOpacity: 1, strokeColor: "black"},
OpenLayers.Feature.Vector.style["default"]));
// mock up a protocol for synchronous and successful commits
var wfs_protocol = new OpenLayers.Protocol.WFS({url:"http://localhost/cgi-bin/mapserv.exe?map=C:/ms4w/apps/openlayers-2.10/examples/xyz.map&SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&TYPENAME=xyz",
featureType: "xyz",
srsName: "EPSG:900913"});
var wfslayer = new OpenLayers.Layer.Vector("WFS", {styleMap: styleMap,
strategies: [new OpenLayers.Strategy.BBOX()],
protocol: wfs_protocol
});
map.addLayer(wfslayer);
map.addControl(new OpenLayers.Control.MousePosition());
map.addControl(new OpenLayers.Control.LayerSwitcher());
//MAP CONTROLS
var defStyle = {strokeColor: "red", strokeOpacity: "0.7", strokeWidth: 1, fillColor: "red", pointRadius: 3, cursor: "pointer"};
var sty = OpenLayers.Util.applyDefaults(defStyle, OpenLayers.Feature.Vector.style["default"]);
var DeleteFeature = OpenLayers.Class(OpenLayers.Control, {
initialize: function(layer, options) {
OpenLayers.Control.prototype.initialize.apply(this, [options]);
this.layer = layer;
this.handler = new OpenLayers.Handler.Feature(
this, layer, {click: this.clickFeature}
);
},
clickFeature: function(feature) {
// if feature doesn't have a fid, destroy it
if(feature.fid == undefined) {
this.layer.destroyFeatures([feature]);
} else {
feature.state = OpenLayers.State.DELETE;
this.layer.events.triggerEvent("afterfeaturemodified", {feature: feature});
feature.renderIntent = "select";
this.layer.drawFeature(feature);
}
},
setMap: function(map) {
this.handler.setMap(map);
OpenLayers.Control.prototype.setMap.apply(this, arguments);
},
CLASS_NAME: "OpenLayers.Control.DeleteFeature"
});
var panel = new OpenLayers.Control.Panel(
{'displayClass': 'customEditingToolbar'}
);
var navigate = new OpenLayers.Control.Navigation({
title: "Pan Map"
});
var drawpath = new OpenLayers.Control.DrawFeature(
vlayer, OpenLayers.Handler.Path,
{
title: "Draw Path",
displayClass: "olControlDrawFeaturePath",
multi: true
}
);
var drawpoint = new OpenLayers.Control.DrawFeature(
vlayer, OpenLayers.Handler.Point,
{
title: "Add Point",
displayClass: "olControlDrawFeaturePoint",
multi: true
}
);
var box = new OpenLayers.Control.DrawFeature(vlayer,
OpenLayers.Handler.RegularPolygon, {
handlerOptions: {
sides: 4,
irregular: true
} ,
title: "Box Feature Select",
displayClass: "olControlDrawFeatureBox"});
var edit = new OpenLayers.Control.ModifyFeature(vlayer, {
title: "Modify Feature",
displayClass: "olControlModifyFeature"
});
var del = new DeleteFeature(vlayer, {title: "Delete Feature"});
panel.addControls([navigate,del, edit, box, drawpoint, drawpath]);
panel.defaultControl = navigate;
map.addControl(panel);
panel.activate();
map.zoomToMaxExtent();
map.setCenter(new OpenLayers.LonLat(-82, 28),5);
vlayer.events.on({
beforefeatureadded: function(event) { //here also tried with featureadded
var geometry = event.feature.geometry;
alert(geometry);
wfslayer.filter = new OpenLayers.Filter.Spatial({
type: OpenLayers.Filter.Spatial.DWITHIN,
property: "the_geom",
value: event.feature.geometry,
distance: 200000,
distanceUnits: 'm'
});
wfslayer.refresh({force: true});
var style_green =
{
strokeColor: "#00FF00",
strokeOpacity: 0.7,
strokeWidth: 4,
graphicName: 'square',
fillColor: '#FF0000',
pointRadius: 5
};
vlayer.drawFeature(event.feature, style_green);
alert(wfslayer.filter.evaluate(event.feature));
return false;
}
});
}
MAPFILE ----
MAP
NAME "QGIS-MAP"
# Map image size
SIZE 600 600
UNITS meters
EXTENT -101.455432 18.242354 -73.740758 33.963395
FONTSET './etc/fonts.txt'
SYMBOLSET './etc/symbols.txt'
PROJECTION
'proj=longlat'
'ellps=WGS84'
'towgs84=0,0,0,0,0,0,0'
'no_defs'
END
# Background color for the map canvas -- change as desired
IMAGECOLOR 255 255 255
IMAGEQUALITY 95
IMAGETYPE agg
OUTPUTFORMAT
NAME agg
DRIVER AGG/PNG
IMAGEMODE RGB
END
# Legend
LEGEND
IMAGECOLOR 255 255 255
STATUS ON
KEYSIZE 18 12
LABEL
TYPE BITMAP
SIZE MEDIUM
COLOR 0 0 89
END
END
# Web interface definition. Only the template parameter
# is required to display a map. See MapServer documentation
WEB
# Set IMAGEPATH to the path where MapServer should
# write its output.
IMAGEPATH '/ms4w/tmp/ms_tmp/'
# Set IMAGEURL to the url that points to IMAGEPATH
# as defined in your web server configuration
IMAGEURL '/ms_tmp/'
# WMS server settings
METADATA
'ows_title' 'QGIS-MAP'
'ows_onlineresource' 'http://localhost/cgi-bin/mapserv.exe?map=C:/ms4w/Apache/htdocs/qgismapserv_org/xyz.map&'
'ows_srs' 'EPSG:4326 EPSG:900913'
'ows_enable_request' 'GetMap GetFeature GetFeatureInfo *' ##necessary
END
#Scale range at which web interface will operate
# Template and header/footer settings
# Only the template parameter is required to display a map. See MapServer documentation
#TEMPLATE 'fooOnlyForWMSGetFeatureInfo'
END
LAYER
NAME 'xyz'
TYPE POINT
DUMP true
#TEMPLATE fooOnlyForWMSGetFeatureInfo
EXTENT -101.455432 18.242354 -73.740758 33.963395
CONNECTIONTYPE postgis
CONNECTION "dbname='postgis' host=localhost port=5432 user='postgres' password='xxx' sslmode=disable"
DATA 'the_geom FROM us1gc09m USING UNIQUE fids'
METADATA
'ows_title' 'xyz'
'wfs_typename' 'xyz'
'wfs_version' '1.0.0'
'wfs_connectiontimeout' '60'
'wfs_maxfeatures' '150'
'wfs_filter' 'GET'
'wfs_featureid' 'the_geom'
END
STATUS OFF
TRANSPARENCY 100
PROJECTION
'proj=longlat'
'ellps=WGS84'
'towgs84=0,0,0,0,0,0,0'
'no_defs'
END
CLASS
NAME 'xyz'
STYLE
SYMBOL "circle"
SIZE 7.0
OUTLINECOLOR 0 0 0
COLOR 123 143 78
END
END
END
END
Awaiting for a solution.
With Regards,
Neelima Emmani
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