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I have a GPX-Track containing LatLon coordinates based on WGS84. The track should be drawn on a cropped map, and for this, I need the pixel coordinates. The map tiles are from OSM

I'm not quite sure how to do this, but I figured out a way (without implementing it yet, since I don't have the formulars right now).

  1. Convert LatLon to Spherical Mercator which is used by OSM
  2. Linear transformation spherical mercator -> pixel coordinates. For step 2., 2 identical points are needed. I guess I can use the map's corner points.

Is there a better way to do this?

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up vote -2 down vote accepted

Solved the Problem. Code here: http://verbose-mode.de/2013/02/cropped-maps-und-wgs84-koordinaten/

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We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

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The link is broken, and in any event, link-only answers are of limited use, so I recommend including the solution in your answer. – PolyGeo Oct 8 '15 at 22:29

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