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I use PROJ.4 cs2cs to convert data from a Lambert Conformal Conic to a geodetic coordinate (NAD83) or vice versa. In my application, sometimes I need to convert a lot of data. Because I call cs2cs with subprocess.Popen() and parse result in python, input/output overhead becomes too big for a large data set.

Is there an faster alternative to cs2cs or a way to make calling cs2cs in python faster?

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The answer is Pyproj. Transforms lists of coordinates in a single call, and since it's a C extension module that uses PROJ.4, the same results as cs2cs but at C speed.

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    Using pyproj increased the speed by 11,000 times faster. Thanks! – user28857 Feb 12 '15 at 17:45
  • Great! Mark the question answered :) – sgillies Feb 13 '15 at 16:06

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