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keyword

value

source

service

WMS

Mandatory WMS standard value

request

GetMap

Mandatory WMS standard value

version

1.3.0

One of the mandatory WMS standard values returned by returned by the request=GetCapabilities

BBOX

0,50,10,55

bounding box: min(longitude),min(latitude),max(longitude),max(latitude) . WMS is know to be a hotchpotch for coordinate order, this particular server configuration seems to prefer lat-lon.

layers

topo

WMS counterpart of WCS coverage

format

image/png

One of the mandatory WMS standard values by returned by the request=GetCapabilities tag <Capability><Request><GetCapabilities><Format>. In the example above there are 4 formats.

CRS

EPSG%3A4326

One of the server-defined values by returned by the request=GetCapabilities tag <Layer><Layer><Layer queryable="1"><CRS>. In the example above there are 9 geographic projections available . Note that the colon in EPSG:4326 has been replaced by by %3A because colons are not allowed in urls. CRS always consists of namespace:identifier, in this case there are two namespaces.For more info on the projections see spatialreference.org and epsg-registry.org.

width

800

width of the image in number of pixels. The xml file show a max
MaxWidth and MaxHeight allowd by the server.

height

600

height of the image in number of pixels

styles

boxfill/redblue

One of the server-defined values by returned by the request=GetCapabilities tag <Layer><Layer><Layer queryable="1"><Name>topo</Name><Style><Name>. In the example above there are 10 styles, for screenshots click the gallery below. Unfortunately, it is not easily possible to supply your own colormap and colorlimits. for this you need to obtain the data and plot it yourselves, please refer to our WCS primer.

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WMS offers more than described in this primer. It it also possible to request a legend for a specific style, and to request the data at one pixel an image you requested. For these more sophisticated options, please refer to the full WMS specifications or WMS extentions with some non-standard extensions by THREDDS/ncWMS

See also: MassGIS WMS, Opengeo WMS

Examples

Gallery