[OpenLayers-Users] What does the projection do in OL

[Phil Scadden]

The projection on the map is whatever the projection of current 
baselayer is. It will then request all other layers are served in this 
projection. The server providing the data should be reprojecting it on 
the fly. I am guessing the WMTS was your base layer. In general, 4326 is 
fine for storing data on your server, but as a "projection", (Plate 
Carree), it has no redeeming cartographic properties whatsoever.

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