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WMSParameters.md

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#Example

var terrainProvider = new Cesium.GeoserverTerrainProvider({
			service: "WMS",	
	        url : "http://localhost:8080/geoserver/elevation/wms",
	        layerName: "SRTM90",
	        xml: xmlGetCapabilities,
	        proxy: proxy,
	        heightMapWidth: 64,
          heightMapHeight: 64,
	        offset: 0,
	        highest: 12000,
	        lowest: -500,
	        styleName: "grayToColor",
	        hasStyledImage: true,
	        maxLevel: 11,
	        formatImage: {format : "image/png",extension: "png"},
	        formatArray: {
				format : "image/bil",
				/**
				* bufferIn : buffer to process (switch byte order and check the data limitations)
				* size: defines the dimension of the array (size.height* size.width cells)
				* highest: defines the highest altitude (without offset) of the data. 
				* lowest: defines the lowest altitude (without offset) of the data. 
				* offset: defines the offset of the data in order to adjust the limitations
				*/
				postProcessArray : function(bufferIn, size,highest,lowest,offset) {
					var resultat;
					var viewerIn = new DataView(bufferIn);
					var littleEndianBuffer = new ArrayBuffer(size.height * size.width * 2);
					var viewerOut = new DataView(littleEndianBuffer);
					if (littleEndianBuffer.byteLength === bufferIn.byteLength) {
						// time to switch bytes!!
						var temp, goodCell = 0, somme = 0;
						for (var i = 0; i < littleEndianBuffer.byteLength; i += 2) {
							temp = viewerIn.getInt16(i, false)-offset;
							if (temp > lowest && temp < highest) {
								viewerOut.setInt16(i, temp, true);
								somme += temp;
								goodCell++;
							} else {
								var val = (goodCell == 0 ? 1 : somme / goodCell);
								viewerOut.setInt16(i, val, true);
							}
						}
						resultat = new Int16Array(littleEndianBuffer);
					}
					return resultat;
				}
			}
	    });

#Details For the example the workspace in geoserver is "elevation", the layer name is "SRTM90", the url of geoserver is "geoURL" and the name of style is "grayToColor".

parameter mandatory type default value geoserver example geoWebCache example comments
service NO String "WMS" "WMS" "WMS" indicates type of service
layerName YES String undefined "SRTM90" "elevation:SRTM90" name of the layer to use
url NO (see comments) String undefined "geoURL/elevation/wms" "geoURL/gwc/service/wms" URL to acces to getCapabilities document (and ressources of the layer!!). Either xml (see below) and url must be defined
xml NO (see comments) XMLDocument undefined XMLDocument of geoURL/elevation/wms?SERVICE=WMS&REQUEST=GetCapabilities&tiled=true XMLDocument of geoURL/gwc/service/wms?SERVICE=WMS&REQUEST=GetCapabilities&tiled=true xml that defines the metadata of the layer. Either url (see above) and xml must be defined
proxy NO Cesium.DefaultProxy undefined new Cesium.DefaultProxy(urlProxy) new Cesium.DefaultProxy(urlProxy) a proxy to get data from geoserver
heightMapWidth NO Integer 65 128 defines width of tile. It seems that Cesium can't work with tile bigger than a certain size (between 129 and 256).
heightMapHeight NO Integer 65 128 defines height tile. It seems that Cesium can't work with tile bigger than a certain size (between 129 and 256).
offset NO Number 0 300 400 offset of the data in meters. It's positive to decrease the altitude of data received and it's negative to increase the altitude of data received
highest NO Number 12000 9000 9000 define highest altitude of the layer. If an elevation data is higher, it will be balanced with data of the same sample.
lowest NO Number -500 -800 -800 define lowest altitude of the layer. If an elevation data is lower, it will be balanced with data of the same sample.
styleName NO String undefined "mySLD" "mySLD" Name of style to use for GeoserverTerrainProvider when it works with BILL/DDS or styled images (required in both case). In case of converted images, this parameter must be undefined or parameter hasStyledImage must be false (see below)
hasStyledImage NO Boolean true if styleName is defined, otherwise it's false false true indicates if image type is styled or converted. see comments of styleName parameter above
maxLevel NO Integer 11 10 14 Level maximum to request for the layer. For indication, with a 90 meters (or 3 seconds arc) precision data, level 11 is enough; with a 30 meters (or 1 second arc) precision data, level 13 should be enough.
formatImage NO Object with members:
  • format: mime of the image
  • extension: extension of the image
 undefined {format : "image/jpeg",extension: "jpg"} {format : "image/png",extension: "png"} indicates the type of image to use. If BIL/DDS was added to geoserver, in order to use converted images instead of BILL/DDS, this parameter must be defined. To use styled images without BILL/DDS, formatImage must be defined,and either hasStyledImage is defined to true or styleName must be defined. If BIL/DDS plugin is not inserted in geoserver, GeoserverTerrainProvider will use available image format
formatArray NO Object with members:
  • format: mime of the data
  • postProcessArray: a function to process received arrayData
 undefined see example see example Format array to use instead of default format array. This format is defined only if BIL/DDS is available in geoserver (image/bil MIME). If formatImage is an undefined parameter and image/bil MIME is available, GeoserverTerrain provider will use the default formatArray.