On Wed, 1 Sep 2010, Ian Dees wrote:
Unless the plugin is stretching or reprojecting the image locally somehow, the WMS plugin will have to send the GetMap WMS request with an SRS set to whatever the projection is in JOSM (which causes the server to send back an image in the right projection). If JOSM has projection set to Mercator, it will build the URL with EPSG:3857. ... I think.
No it uses EPSG:4326 when Mercator is selected. The distortion resulting from that is very low due to the tile mechanism and working at high zoom levels.
This "silently assume Mercator is EPSG:4326" should also exist in the future (except the WMS server has Mercator support, which is ignored ATM - very few have).
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