title: How do I access elevation values in a raster .tif?
body: <p>If I have a GeoTiff file of elevation data in a WGS84 coordinate system, how do I access these pixel values in Swift? </p>
  
  <p>The data is from the Global Multi-resolution Terrain Elevation Data 2010, specifically the file <code>30n090w_20101117_gmted_mea300.tif</code>. </p>
  
  <p>Please let me know if you need more information to answer this question. Thanks so very much for your help!</p>