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Tideland and coastline mapping are another field where laser altimetry has been able to prove its advantages over other survey techniques. This area of 10 x 9 km was surveyed in two flights of each about 3 hours to generate a DEM with a 5-m-grid size. Flights were done at night during low tide conditions. In this case the high vertical accuracy achievable with laser altimeters was of major importance as the variation in elevation between purple and orange is only about 2 m. The top image is a color-coded orthogonal view, the bottom image shows a perspective rendering of the marked section. For clarity the vertical axis is exagerated. Left of the dyke the regular structures of salt "fields" and drainage channels inbetween the fields can be recognized. |
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