XPLMMapScaleMeter

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XPLM_API float      XPLMMapScaleMeter(
                         XPLMMapProjectionID  projection,    
                         float                mapX,    
                         float                mapY);

Returns the number of map units that correspond to a distance of one meter at a given set of map coordinates.

Only valid from within a map layer callback (one of XPLMMapPrepareCacheCallback_f, XPLMMapDrawingCallback_f, XPLMMapIconDrawingCallback_f, or XPLMMapLabelDrawingCallback_f.)