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I need to project some dynamic layers to Web Mercator. The geometry service only projects geometries. Is there a geo-processing tool in ArcMap for this? Or any suggestions how i could do this without altering the map services.

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With a dynamic map service, you can simply request it in a different coordinate system using the spatialreference parameter.

Lets assume you already have a map defined in your javascript app, with a spatial reference of 4326 (web mercator), by simply adding the dynamic map service, (with a differing supported spatial reference) it will automatically re-project its map contents to match the map's spatial reference.

See this code sample which shows how you can define a custom extent and spatial reference, and then add a dynamic map service on top, and it will reproject it self to match the coordinate system. Note that there is a performance hit for doing the reprojection.

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