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Export Map request misalignment of underlying layer with different CRS

Question asked by ChrisMugdan on Jul 12, 2018

I have a map service that is in EPSG:3857 and the underlying layers are in EPSG:27700. The resulting map image from an export map is misaligned with a tiled map service that is in EPSG:3857. The interesting thing is that when I query the map layers concerned, the feature coordinates are correct.In our product "MI ARC" I have a local rendering engine that uses the coordinates that have been fetched from the map service and it is aligned correctly.

Is there some way to add support for the transformation of coordinate systems such as EPSG:27700 in the export map function or is this a bug?

I have attached two images that show the difference in rendering.