Communicating with a WMS service in a web browser

You can use URL parameters to communicate with a WMS service in a web browser.

WMS request and response

The online resource of each operation supported by a compliant WMS server is an HTTP uniform resource locator (URL), so a WMS service can be considered as a Representational State Transfer (REST) service. Unlike a standard web service, a SOAP client is not necessary for consuming a WMS service, and a web browser is the simplest client. You can get a WMS service's service-level metadata, a map image, or attribute values of a feature by sending a URL request to the server and viewing the corresponding responses in the browser as either an XML document or an image.

Below are some sample requests and responses for each operation supported by a WMS service.

GetCapabilities

Request

http://sampleserver1.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer?version=1.3.0&request=GetCapabilities&service=WMS

XML response

<WMS_Capabilities version="1.3.0" xsi:schemaLocation="http://www.opengis.net/wms http://schemas.opengis.net/wms/1.3.0/capabilities_1_3_0.xsd http://www.esri.com/wms http://sampleserver1a.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer?version=1.3.0&service=WMS&request=GetSchemaExtension">
 <Service>
  <Name>WMS</Name>
  <Title>Specialty/ESRI_StatesCitiesRivers_USA</Title>
  <Abstract>WMS</Abstract>
  <KeywordList>
   <Keyword></Keyword>
  </KeywordList>
  <OnlineResource xlink:type="simple" xlink:href="http://sampleserver1a.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer"/>
  <ContactInformation>
   <ContactPersonPrimary>
    <ContactPerson></ContactPerson>
    <ContactOrganization></ContactOrganization>
   </ContactPersonPrimary>
    <ContactPosition></ContactPosition>
    <ContactAddress>
     <AddressType></AddressType>
     <Address></Address>
     <City></City>
     <StateOrProvince></StateOrProvince>
     <PostCode></PostCode>
     <Country></Country>
    </ContactAddress>
    <ContactVoiceTelephone></ContactVoiceTelephone>
    <ContactFacsimileTelephone></ContactFacsimileTelephone>
    <ContactElectronicMailAddress></ContactElectronicMailAddress>
  </ContactInformation>
  <Fees></Fees>
  <AccessConstraints></AccessConstraints>
  <MaxWidth>2048</MaxWidth>
  <MaxHeight>2048</MaxHeight>
 </Service>
 <Capability>
  <Request>
   <GetCapabilities>
    <Format>application/vnd.ogc.wms_xml</Format>
    <Format>text/xml</Format>
    <DCPType>
     <HTTP>
      <Get>
       <OnlineResource xlink:type="simple" xlink:href="http://sampleserver1a.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer"/>
      </Get>
     </HTTP>
    </DCPType>
   </GetCapabilities>
   <GetMap>
    <Format>image/bmp</Format>
    <Format>image/jpeg</Format>
    <Format>image/tiff</Format>
    <Format>image/png</Format>
    <Format>image/png8</Format>
    <Format>image/png24</Format>
    <Format>image/png32</Format>
    <Format>image/gif</Format>
    <Format>image/svg+xml</Format>
    <DCPType>
     <HTTP>
      <Get>
       <OnlineResource xlink:type="simple" xlink:href="http://sampleserver1a.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer"/>
      </Get>
     </HTTP>
    </DCPType>
   </GetMap>
   <GetFeatureInfo>
    <Format>application/vnd.esri.wms_raw_xml</Format>
    <Format>application/vnd.esri.wms_featureinfo_xml</Format>
    <Format>application/vnd.ogc.wms_xml</Format>
    <Format>text/xml</Format>
    <Format>text/html</Format>
    <Format>text/plain</Format>
    <DCPType>
     <HTTP>
      <Get>
       <OnlineResource xlink:type="simple" xlink:href="http://sampleserver1a.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer"/>
      </Get>
     </HTTP>
    </DCPType>
   </GetFeatureInfo>
   <esri_wms:GetStyles>
    <Format>application/vnd.ogc.sld+xml</Format>
    <DCPType>
     <HTTP>
      <Get>
       <OnlineResource xlink:type="simple" xlink:href="http://sampleserver1a.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer"/>
      </Get>
     </HTTP>
    </DCPType>
   </esri_wms:GetStyles>
  </Request>
  <Exception>
   <Format>application/vnd.ogc.se_xml</Format>
   <Format>application/vnd.ogc.se_inimage</Format>
   <Format>application/vnd.ogc.se_blank</Format>
   <Format>text/xml</Format>
   <Format>XML</Format>
  </Exception>
  <Layer>
   <Title>Layers</Title>
   <CRS>CRS:84</CRS>
   <CRS>EPSG:4326</CRS>
   <EX_GeographicBoundingBox>
    <westBoundLongitude>-125.192865</westBoundLongitude>
    <eastBoundLongitude>-66.105824</eastBoundLongitude>
    <southBoundLatitude>19.416377</southBoundLatitude>
    <northBoundLatitude>54.318281</northBoundLatitude>
   </EX_GeographicBoundingBox>
   <BoundingBox CRS="CRS:84" minx="-125.192865" miny="19.416377" maxx="-66.105824" maxy="54.318281"/>
   <BoundingBox CRS="EPSG:4326" minx="19.416377" miny="-125.192865" maxx="54.318281" maxy="-66.105824"/>
   <Layer queryable="1">
    <Name>0</Name>
    <Title>States</Title>
    <Abstract>States</Abstract>
    <CRS>CRS:84</CRS>
    <CRS>EPSG:4326</CRS>
    <EX_GeographicBoundingBox>
     <westBoundLongitude>-178.217598</westBoundLongitude>
     <eastBoundLongitude>-66.969271</eastBoundLongitude>
     <southBoundLatitude>18.924782</southBoundLatitude>
     <northBoundLatitude>71.406235</northBoundLatitude>
    </EX_GeographicBoundingBox>
    <BoundingBox CRS="CRS:84" minx="-178.217598" miny="18.924782" maxx="-66.969271" maxy="71.406235"/>
    <BoundingBox CRS="EPSG:4326" minx="18.924782" miny="-178.217598" maxx="71.406235" maxy="-66.969271"/>
    <Style>
     <Name>default</Name>
     <Title>0</Title>
     <LegendURL width="76" height="16">
      <Format>image/png</Format>
      <OnlineResource xlink:href="http://sampleserver1a.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer?request=GetLegendGraphic%26version=1.3.0%26format=image/png%26layer=0" xlink:type="simple"/>
     </LegendURL>
    </Style>
   </Layer>
   <Layer queryable="1">
    <Name>1</Name>
    <Title>Rivers</Title>
    <Abstract>Rivers</Abstract>
    <CRS>CRS:84</CRS>
    <CRS>EPSG:4326</CRS>
    <EX_GeographicBoundingBox>
     <westBoundLongitude>-164.765831</westBoundLongitude>
     <eastBoundLongitude>-67.790980</eastBoundLongitude>
     <southBoundLatitude>25.845557</southBoundLatitude>
     <northBoundLatitude>70.409756</northBoundLatitude>
    </EX_GeographicBoundingBox>
    <BoundingBox CRS="CRS:84" minx="-164.765831" miny="25.845557" maxx="-67.790980" maxy="70.409756"/>
    <BoundingBox CRS="EPSG:4326" minx="25.845557" miny="-164.765831" maxx="70.409756" maxy="-67.790980"/>
    <Style>
     <Name>default</Name>
     <Title>1</Title>
     <LegendURL width="76" height="16">
      <Format>image/png</Format>
      <OnlineResource xlink:href="http://sampleserver1a.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer?request=GetLegendGraphic%26version=1.3.0%26format=image/png%26layer=1" xlink:type="simple"/>
     </LegendURL>
    </Style>
   </Layer>
   <Layer queryable="1">
    <Name>2</Name>
    <Title>Cities</Title>
    <Abstract>Cities</Abstract>
    <CRS>CRS:84</CRS>
    <CRS>EPSG:4326</CRS>
    <EX_GeographicBoundingBox>
     <westBoundLongitude>-158.064606</westBoundLongitude>
     <eastBoundLongitude>-67.986769</eastBoundLongitude>
     <southBoundLatitude>19.696150</southBoundLatitude>
     <northBoundLatitude>64.869104</northBoundLatitude>
    </EX_GeographicBoundingBox>
    <BoundingBox CRS="CRS:84" minx="-158.064606" miny="19.696150" maxx="-67.986769" maxy="64.869104"/>
    <BoundingBox CRS="EPSG:4326" minx="19.696150" miny="-158.064606" maxx="64.869104" maxy="-67.986769"/>
    <Style>
     <Name>default</Name>
     <Title>2</Title>
     <LegendURL width="72" height="16">
      <Format>image/png</Format>
      <OnlineResource xlink:href="http://sampleserver1a.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer?request=GetLegendGraphic%26version=1.3.0%26format=image/png%26layer=2" xlink:type="simple"/>
     </LegendURL>
    </Style>
   </Layer>
  </Layer>
 </Capability>
</WMS_Capabilities>

GetMap

Request

http://sampleserver1.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer?version=1.3.0&request=GetMap&CRS=CRS:84&bbox=-178.217598,18.924782,-66.969271,71.406235&width=760&height=360&layers=0&styles=default&format=image/png

Response map

Request

http://gisserver.domain.com:6080/arcgis/services/folder/service/MapServer/WMSServer?REQUEST=GetMap&SERVICE=WMS&VERSION=1.3.0&LAYERS=0&STYLES=&FORMAT=image/png&BGCOLOR=0xFFFFFF&TRANSPARENT=TRUE&CRS=EPSG:4326&BBOX=17.9995833333334,-161.000416666667,23.0004166666666,-153.999583333333&WIDTH=981&HEIGHT=826&DIM_DEPTH=2000

For WMS services containing any time or elevation aware layers, the TIME or ELEVATION parameter can be added.

Time

TIME—Supports time queries by specifying a time instance or time range.

TIME=1999 (time at year 1999)

Request

http://gisserver.domain.com:6080/arcgis/services/folder/service/ImageServer/WMSServer?REQUEST=GetMap&SERVICE=WMS&VERSION=1.3.0&LAYERS=0&STYLES=&FORMAT=image/png&BGCOLOR=0xFFFFFF&TRANSPARENT=TRUE&CRS=EPSG:4326&BBOX=17.9995833333334,-161.000416666667,23.0004166666666,-153.999583333333&WIDTH=981&HEIGHT=826&TIME=1999

TIME=1980/2010 (time from year 1980 to 2010)

Request

http://gisserver.domain.com:6080/arcgis/services/folder/service/ImageServer/WMSServer?REQUEST=GetMap&SERVICE=WMS&VERSION=1.3.0&LAYERS=0&STYLES=&FORMAT=image/png&BGCOLOR=0xFFFFFF&TRANSPARENT=TRUE&CRS=EPSG:4326&BBOX=17.9995833333334,-161.000416666667,23.0004166666666,-153.999583333333&WIDTH=981&HEIGHT=826&TIME=1980/2010

TIME=1999-12-31T14:30:30/2000-01-01T14:30:30

Request

http://gisserver.domain.com:6080/arcgis/services/folder/service/ImageServer/WMSServer?REQUEST=GetMap&SERVICE=WMS&VERSION=1.3.0&LAYERS=0&STYLES=&FORMAT=image/png&BGCOLOR=0xFFFFFF&TRANSPARENT=TRUE&CRS=EPSG:4326&BBOX=17.9995833333334,-161.000416666667,23.0004166666666,-153.999583333333&WIDTH=981&HEIGHT=826&TIME=1999-12-31T14:30:30/2000-01-01T14:30:30

Elevation

You can also perform the getMap request to use ELEVATION (a keyword defined in the WMS specification) if the vertical dimension field has been specifically defined in the mosaic dataset or NetCDF layer, before publishing services. You can specify the vertical dimension field in the Vertical property of the Mosaic Dataset Properties Defaults for mosaic datasets or on the NetCDF tab on the Layer Property page for NetCDF layers.

http://gisserver.domain.com:6080/arcgis/services/folder/service/ImageServer/WMSServer?REQUEST=GetMap&SERVICE=WMS&VERSION=1.3.0&LAYERS=0&STYLES=&FORMAT=image/png&BGCOLOR=0xFFFFFF&TRANSPARENT=TRUE&CRS=EPSG:4326&BBOX=17.9995833333334,-161.000416666667,23.0004166666666,-153.999583333333&WIDTH=981&HEIGHT=826&TIME=2000-01-01T14:30:30&ELEVATION=-30

GetFeatureInfo

Request

http://sampleserver1.arcgisonline.com/arcgis/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer?version=1.1.1&request=GetFeatureInfo&layers=0&styles=default&SRS=EPSG:4326&bbox=-125.192865,11.2289864971264,-66.105824,62.5056715028736&width=1044&height=906&format=text/html&X=500&Y=400&query_layers=0

XML response

<FeatureInfoResponse>
 <FIELDS FID="14" Shape="Null" AREA="77330.258" STATE_NAME="Nebraska" STATE_FIPS="31" SUB_REGION="W N Cen" 
  STATE_ABBR="NE" POP1990="1578385" POP1999="1671251" POP90_SQMI="20" HOUSEHOLDS="602363" MALES="769439" 
  FEMALES="808946" WHITE="1480558" BLACK="57404" AMERI_ES="12410" ASIAN_PI="12422" OTHER="15591" 
  HISPANIC="36969" AGE_UNDER5="119606" AGE_5_17="309406" AGE_18_29="281105" AGE_30_49="441470" 
  AGE_50_64="203730" AGE_65_UP="223068" NEVERMARRY="295873" MARRIED="719288" SEPARATED="13552" 
  WIDOWED="96052" DIVORCED="90230" HSEHLD_1_M="63686" HSEHLD_1_F="95985" MARHH_CHD="171428" 
  MARHH_NO_C="179086" MHH_CHILD="7603" FHH_CHILD="34583" HSE_UNITS="660621" VACANT="58258" 
  OWNER_OCC="400394" RENTER_OCC="201969" MEDIAN_VAL="50400" MEDIANRENT="282" UNITS_1DET="479124" 
  UNITS_1ATT="15767" UNITS2="18369" UNITS3_9="46246" UNITS10_49="49402" UNITS50_UP="9656" 
  MOBILEHOME="37046" NO_FARMS87="60502" AVG_SIZE87="749" CROP_ACR87="23320162" AVG_SALE87="110197"/>
</FeatureInfoResponse>

GetStyles

Request

http://sampleserver1.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StateCityHighway_USA/MapServer/WMSServer?version=1.3.0&request=GetStyles&layers=0,1,2

XML response

<sld:StyledLayerDescriptor version="1.0.0" xsi:schemaLocation="http://www.opengis.net/sld http://schemas.opengis.net/sld/1.0.0/StyledLayerDescriptor.xsd">
 <!-- layer "0" -->
 <sld:NamedLayer>
  <sld:Name>0</sld:Name>
  <!-- NamedStyle -->
  <sld:NamedStyle>
   <sld:Name>default</sld:Name>
  </sld:NamedStyle>
  <!-- UserStyle -->
 </sld:NamedLayer>
 <!-- layer "1" -->
 <sld:NamedLayer>
  <sld:Name>1</sld:Name>
  <!-- NamedStyle -->
  <sld:NamedStyle>
   <sld:Name>default</sld:Name>
  </sld:NamedStyle>
  <!-- UserStyle -->
 </sld:NamedLayer>
 <!-- layer "2" -->
 <sld:NamedLayer>
  <sld:Name>2</sld:Name>
  <!-- NamedStyle -->
  <sld:NamedStyle>
   <sld:Name>default</sld:Name>
  </sld:NamedStyle>
  <!-- UserStyle -->
 </sld:NamedLayer>
</sld:StyledLayerDescriptor>

GetLegendGraphic

Request

http://sampleserver1.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer?version=1.1.1&request=GetLegendGraphic&layer=0&style=default&format=image/png&width=95&height=65

Response legend graphic

Note:

In many cases, a web browser may not be a preferred WMS client, but it is always a good tool to track and debug the communication between a WMS server and client.

WMS request parameters

OGC Web Map Service specifications define a complete list of request parameters that can be used in each WMS operation. See the links below for different versions of the OGC WMS implementation specification:

Version 1.3.0

Version 1.1.1

Version 1.1.0

Version 1.0.0

The tables below list all the request parameters that are applicable to the WMS implementation, which is only a subset of those defined in the specification.

Parameters of a WMS GetCapabilities request URL

Parameter	Mandatory/Optional	Default value	Description
VERSION/WMTVER	Optional	1.3.0 (9.3 and later) 1.1.1 (9.2)	Request version. Only use WMTVER in WMS 1.0.0; otherwise, use VERSION.
SERVICE	Mandatory	N/A	Service type. It must be set to WMS. The parameter is not available in WMS 1.0.0.
REQUEST	Mandatory	N/A	Request name. It must be set to GetCapabilities. For WMS 1.0.0, it must be set to capabilities.
FORMAT	Optional	text/xml (9.3 and later)	Output format for service metadata. This is only available in WMS 1.3.0 (for example, application/vnd.ogc.wms_xml, text/plain, or text/html).

Parameters of a WMS GetMap request URL

Parameter	Mandatory/Optional	Default value	Description
VERSION/WMTVER	Mandatory	N/A	Request version. Only use WMTVER in WMS 1.0.0; otherwise, use VERSION.
REQUEST	Mandatory	N/A	Request name. It must be set to GetMap. For WMS 1.0.0, it must be set to map.
LAYERS	Mandatory	N/A	Comma-separated list of one or more map layers (for example, 0,1,2 or layer1,layer2).
STYLES	Mandatory	N/A	Comma-separated list of one or more styles, one style per requested layer (for example, 0,1,2 or style1,style2).
CRS/SRS	Mandatory	N/A	Coordinate reference system. CRS is only used in WMS 1.3.0; otherwise, use SRS (for example, EPSG:4326 or EPSG:4269).
BBOX	Mandatory	N/A	Bounding box corners (lower left and upper right) in CRS/SRS units (for example, -180,-90,180,90).
WIDTH	Mandatory	N/A	Width in pixels of map picture (for example, 1024).
HEIGHT	Mandatory	N/A	Height in pixels of map picture (for example, 768).
FORMAT	Mandatory	N/A	Output format of map (for example, image/png, image/jpeg, image/svg+xml, or image/bil). If you're specifying the output format as image/bil, the WMS client will also need to generate a corresponding header (.hdr) to read the images properly.
TRANSPARENT	Optional	False	Determines whether background is transparent or not (True or False, respectively).
BGCOLOR	Optional	0xFFFFFF	Hexadecimal RGB color for the map background (for example, 0xFFFFFF or FFFFFF).
SLD	Optional	""	URL of Styled Layer Descriptor XML file.
SLD_BODY	Optional	""	XML body of Styled Layer Descriptor file.
TIME	Optional	""	Time value of requested layer. ArcGIS client applications only support the TIME dimension if the layer is time enabled. If the layer is not time enabled, you'll need to use a web browser or custom client to submit a GetMap request using the DIM_ parameter (listed below).
ELEVATION	Optional	""	Elevation value of requested layer. ArcGIS client applications only support the ELEVATION dimension if the layer is elevation aware. You can only set elevation in NetCDF and mosaic datasets.
EXCEPTIONS	Optional	text/xml (WMS 1.3.0) application/vnd.ogc.se_xml (WMS 1.1.1 and WMS 1.1.0) application/vnd.ogc.inimage (WMS 1.0.0)	The format in which exceptions should be reported (for example, text/xml or text/html).
DIM_<name>	Optional	""	Dimension value of the requested map layers; <name> must be replaced with the name of a dimension, for example, DEPTH. DIM_ is supported in WMS 1.1.0 and later. Dimensions are not currently supported through ArcGIS client applications. To consume dimensions, you'll need to use a web browser or create your own custom OGC client application using ArcObjects or another language.

Parameters of a WMS GetFeatureInfo request URL

Parameter	Mandatory/Optional	Default value	Description
VERSION/WMTVER	Mandatory	N/A	Request version. Only use WMTVER in WMS 1.0.0; otherwise, use VERSION.
REQUEST	Mandatory	N/A	Request name. It must be set to GetFeatureInfo. For WMS 1.0.0, it must be set to feature_info.
Map request part	Mandatory	N/A	Partial copy of the GetMap request parameters that generated the map for which information is desired.
QUERY_LAYERS	Mandatory	N/A	Comma-separated list of one or more map layers to be queried (for example, 0,1,2 or layer1,layer2).
INFO_FORMAT	Mandatory (WMS 1.3.0) Optional (WMS 1.1.1, 1.1.0, 1.0.0)	N/A (WMS 1.3.0) text/xml (WMS 1.1.1, 1.1.0, 1.0.0)	Return format of feature information (for example, text/xml or text/html).
I/X	Mandatory	N/A	X-coordinate in pixels of feature in map coordinate system (for example, 100). Use I for WMS 1.3.0; otherwise, use X.
J/Y	Mandatory	N/A	Y-coordinate in pixels of feature in map coordinate system (for example, 100). Use J for WMS 1.3.0; otherwise, use Y.
TIME	Optional	""	Time value of requested layer. ArcGIS client applications only support the TIME dimension if the layer is time enabled. If the layer is not time enabled, you'll need to use a web browser or custom client to submit a GetMap request using the DIM_ parameter (listed below).
ELEVATION	Optional	""	Elevation value of requested layer. ArcGIS client applications only support the ELEVATION dimension if the layer is elevation aware. You can only set elevation in NetCDF and mosaic datasets.
EXCEPTIONS	Optional	text/xml (WMS 1.3.0) application/vnd.ogc.se_xml (WMS 1.1.1 and WMS 1.1.0) application/vnd.ogc.inimage (WMS 1.0.0)	The format in which exceptions should be reported (for example, text/xml or text/html).
DIM_<name>	Optional	""	Dimension value of the requested map layers; <name> must be replaced with the name of a dimension, for example, DEPTH. DIM_ is supported in WMS 1.1.0 and above. Dimensions are not currently supported through ArcGIS client applications. To consume dimensions, you'll need to use a web browser or create your own custom OGC client application using ArcObjects or another language.

Parameters of a WMS GetStyles request

Parameter	Mandatory/Optional	Default value	Description
VERSION	Mandatory	1.3.0(9.3 and later) 1.1.1 (9.2)	Version as required by OGC interfaces.
REQUEST	Mandatory	N/A	Request name. It must be set to GetStyles.
LAYERS	Mandatory	N/A	Comma-separated list of named layers for which to retrieve style descriptions.
SLDVER	Optional	1.0.0 (10.0)	The SLD version requested for the SLD document. Only version 1.0.0 is supported.

Parameters of a WMS GetLegendGraphic request

Parameter	Mandatory/Optional	Default value	Description
VERSION	Mandatory	1.3.0(9.3 and later) 1.1.1 (9.2)	Version as required by OGC interfaces.
REQUEST	Mandatory	N/A	Request name. It must be set to GetLegendGraphic.
LAYER	Mandatory	N/A	Layer for which to produce the legend graphic.
STYLE	Optional	default	Style of layer for which to produce the legend graphic. If not present, the default style is selected. The style may be any valid style available for a layer, including non-SLD internally defined styles.
RULE	Optional	""	Style rule for which to produce the legend graphic, if applicable. When a style has multiple rules but no specific rule is selected, the map service is obligated to produce a graphic that is representative of all the rules of the style.
SLD	Optional	""	Specifies a reference to an SLD document. It works in the same way as the SLD= parameter of the WMS GetMap operation.
SLD_BODY	Optional	""	Allows an SLD document to be included directly in an HTTP GET request. It works in the same way as the SLD_BODY parameter of the WMS GetMap operation.
FORMAT	Optional	image/png (png24)	The MIME type of the file format in which to return the legend graphic. Allowed values are the same as for the FORMAT= parameter of the WMS GetMap request.
WIDTH	Optional	Depends on the specific legend image	Gives a hint for the width of the returned graphic in pixels.
HEIGHT	Optional	Depends on the specific legend image	Gives a hint for the height of the returned graphic in pixels.
EXCEPTIONS	Optional	text/xml (WMS 1.3.0) application/vnd.ogc.se_xml (WMS 1.1.1 and WMS 1.1.0) application/vnd.ogc.inimage (WMS 1.0.0)	The MIME type of the format in which to return exceptions. Allowed values are the same as for the EXCEPTIONS= parameter of the WMS GetMap request.