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We have a web application that has tiled layers published in GCS.
We want to publish a replica of the layers in a different projection system such that :
When a user is at a specific zoom level, GCS based tiles are rendered. However when the user zooms in, the spatial reference of tha map is changed to a different projection system and tiled published for that projection system are rendered.
We are using ArcGIS JavaScript API 3.25.
You cannot change the projection of the Map. You would have to remove/hide the first Map, then create/show another Map with the new projection. And keep track of users location, user set layer visibilities etc.
https://developers.arcgis.com/javascript/3/jsapi/map-amd.html
