USGS DEM trivials

• Get the correct folder name

     
string foldername = (lat > 0 ? "n" + Math.Ceiling(lat).ToString("00") : "s" + Math.Ceiling(lat * -1).ToString("00")) + (lon > 0 ? "e" + Math.Ceiling(lon).ToString("000") : "w" + Math.Ceiling(lon * -1).ToString("000"));

• Does each DEM data has the same cell size? No. The scanning result shows the following possibilities

              9.2592592593E-05
              9.2592592599959E-05
              9.2592592599958E-05