title: convert WSG84 gps coordinate to x y cartesian coordinate on a plane
body: <p>I'm working on an android application which can track movements. My problem is that I need to convert gps coordinates to <strong>2-d coordinate on a plane</strong>. </p>
  
  <p>The coordinates which I obtain now are in WSG84 format. I need those coordinates because a I need to compute the distance between a point and a line in order to understand if I'm getting too far from a pre-defined path. The area in which I'm working on is not big in respect to the whole earth, so I think it's okay to not care about z axis. </p>
  
  <p>I have no map, so I just need to compute these coordinates in background. Thanks!</p>