Is it possible to set the project CRS via a Python command?
A little late to answer, but in case someone drops to that page from google, without having the plugin installed, http://www.purplelinux.co.nz provides good information on that.
The example found on purplelinux (which is working fine) suggest the following:
if iface.mapCanvas().mapRenderer().hasCrsTransformEnabled():
my_crs = core.QgsCoordinateReferenceSystem(4326,core.QgsCoordinateReferenceSystem.EpsgCrsId)
iface.mapCanvas().mapRenderer().setDestinationCrs(my_crs)
And you could even create a CRS by calling:
QgsCoordinateReferenceSystem("PROPERTY:ID")
which would be:
QgsCoordinateReferenceSystem("EPSG:31467")
which IMHO makes the code much more readable.
Yes, its possible. The Openlayers plugin by Sourcepole automatically sets CRS to EPSG:3857.
Have a look at openlayers_layers.py and openlayers_plugin.py.
Use this:
QgsProject.instance().setCrs(my_crs)