Take the 2-minute tour ×  here I see a question about tiled map
services. But what about dealing with an arcgis server map
service in a projected coordinate system like say 2278, how
would I convert this to web mercator so that it will fall
correctly in my map?  What are the choices using dynamic layer
or other?  I don't have any control over the map service.
Thanks.  share|improve this question add comment  1 Answer  If
the map service you're using is a dynamic map service, create an
ArcGISDynamicMapServiceLayer and add it to your map that already
has one or more tiled web mercator services. Because dynamic map
services can be projected on the fly, the ArcGIS API for
JavaScript will construct an exportMap request where the
resulting map image is in web mercator. You do not need to worry
about building the request to exportMap– the API does this for
you. The general workflow is as follows:    • create your map
(with or without an extent, if you specify an extent, it needs
to be in web mercator if you're using