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I'm using ArcGIS Desktop 10 and working on a WMS service with Mars data. Currently the GetCapabilities shows <SRS>EPSG:4326</SRS>. I assume ArcGIS 10 reads this and therefore the WMS has GCS_WGS_1984 as a Geographic Coordinate System?

I would like to use a custom URL definition because I am working with data from Mars. Is it for example possible to add a URL with GML such as ?

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up vote 1 down vote accepted

I think the answer is no, (but I am prepared to be wrong on this), there doesn't seem to be an option to add a coordinate reference from URL, when you go into either the layer properties or the Data frame properties you can import a reference system, you can copy one from an existing object/feature class/shape file/database or you can create your own custom one.

reading the help file from the esri website seems to indicate that you may have to do it manually,

or add other data which is in the coordinate system that you want first and then add the WMS which hopefully Arcmap will transform on the fly.

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