title: Overview for converting local plane coordinates to WGS84
body: <p>Let's say I have a small area mapped out using local planar coordinates in meters. e.g. A rectangular warehouse that's 300m x 450m. I use some GPS device to find the WGS 84 lat/lon of one corner of the warehouse.</p>
  
  <p>How can I project my plane coordinates onto the WGS 84 geoid to find the lat/lon values for the 3 other corners of the warehouse?</p>
  
  <p>I understand this is a complicated problem since values vary on different parts of the earth. Do I need to deal with finding some local coordinate system first or can I somehow use the relationship between my known points to go direcly to WGS84?</p>
  
  <p>I don't have a lot of experience with this sort of problem so forgive me if parts of my question don't make any sense.</p>