I need to draw a polyline that is exactly 200 meters thick, regardless of
the zoom level, so I need to compute current scale when map zoom changes or
current viewport center changes significantly. But that's a different story.
That trick @Marcelo mentioned, about computing distance between two
I need to draw a polyline that is exactly 200 meters thick
I'd have thought it would be easier to draw a polygon of two parallel
sides 200m apart
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The info you found for OSM should be applicable to Google Maps as
well.
It's basically find two things: 1) how many horizontal pixel (for
global) at zoom level Z? and 2) how many meters (for global) at
latitude LAT?
The first one is basically 256x2^Z.
The second one should be
The geometry library can calculate the distance in meters between two
lat/lon pairs.
http://code.google.com/apis/maps/documentation/javascript/geometry.html
The Mercator projection object used in this example:
http://code.google.com/apis/maps/documentation/javascript/examples/map-coordinates.html
