[Qgis-developer] Convert QGIS layer scale to OL3 resolution

[Tom Chadwin]

>From OL2'S scaleToResolution():

 resolution = 1 / ((1 / scale) * (inches / map unit) * dpi)

ie

resolution = 1 / ((1 / scale) * (100 / 2.54) * 90.7)

Is that right (for map unit = metre, and dpi = 90.7 [1])? 

Will this be correct only if the OL3 map's projection is in metres? Will I
have to change the unit if required to degrees etc?

[1] http://gis.stackexchange.com/a/29733



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