| 12 | | ..means a DEM that starts in the north-west corner, is 2000x2000 cells, has X values from positions 400000-410000, Y values from positions 850000-860000 and a resolution of 5. This particular example is from a British National Grid projection DEM, as would normally be used for flights in the UK, so the positions are in metres and are related to that projection. |
| | 12 | ..means a DEM that starts in the north-west corner, is 2000x2000 cells, has X values from positions 400000-410000, Y values from positions 850000-860000 and a resolution of 5. This particular example is from a British National Grid projection DEM, as would normally be used for flights in the UK, so the positions are in metres and are related to that projection. |
| | 13 | |
| | 14 | Note that if your DEM runs from south to north rather than north to south as above, you should use a 0 as the first number (rather than 1). |