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Höhendarstellung in OL-Karten mithilfe von Airborne Laser-Scanning

Representing the r elief of Orienteering m aps wit h the a id of a irborne laser s canning. Höhendarstellung in OL-Karten mithilfe von Airborne Laser-Scanning. Thomas Hohl Gymnasium Kirschgarten Basel. Airborne Laser-Scanning. Basic principle. Accuracy in height ± 15cm

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Höhendarstellung in OL-Karten mithilfe von Airborne Laser-Scanning

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  1. Representing the relief of Orienteering maps with the aid of airborne laser scanning Höhendarstellung in OL-Karten mithilfe von Airborne Laser-Scanning Thomas Hohl Gymnasium Kirschgarten Basel

  2. Airborne Laser-Scanning Basic principle Accuracy in height ± 15cm Frequency of bullets/impulse 1 b./imp./2m2

  3. Airborne Laser-Scanning Laserimpulse in forested areas first received impulse last received impulse

  4. Airborne Laser-Scanning Method of analyzing GRID TIN Laser raw data Contour lines

  5. Comparison of contour reliefs Criteria for the test area • existence of an orienteering map • existence of a photogrammetric base map • an area with detailed terrain (depressions, knolls, rocky features) O-maps 'Leutschenberg-Schafmatt' Area 2km x 2km =4km2 Coordinate 636/251 638/249 Geoinformationsystem (GIS) Idrisi 2.2 and ArcGIS 8.3

  6. Comparison of contours reliefs

  7. Comparison of contoursreliefs

  8. Comparison of contoursreliefs Photogrammetric map is not in digital form available only spot samples

  9. Comparison of contoursreliefs Legend open terrain forest dense vegetation north sides of slopes Map with samples

  10. Comparison of contour relief Size of 1 spot sample 150m x 150m Distribution ofspot samples

  11. Comparison of contours reliefs example: spot sample 3b

  12. Comparison of contour relief example: spot sample 3b

  13. Comparison of contour relief example: spot sample 3b

  14. Comparison of contour relief example: spot sample 3b

  15. Comparison of contour relief example: spot sample 3b

  16. Comparison of contour relief example: spot sample 3b

  17. Comparison of contour relief example: spot sample 3b DTM (2,5m) Phtogr. (5m) O-map (5m) DTM (1m)

  18. Comparison of contour relief example: spot sample 3b

  19. Comparison of contour relief example: spot sample 3b

  20. Comparison of contour relief example: spot sample 3b

  21. Comparison of contour relief example: spot sample 3b

  22. Comparison of contour relief example: spot sample 3d DTM (2,5m) Photogr. (5m) map (5m) DTM (1m)

  23. Comparison of contour relief Conclusion 2,5m-DTM - In detailed terrain not sufficient → 1m-DTM - precise contourlines in dense vegetation Photogrammetric base map - not suitable in dense vegetation and north sides of hills • very good representation of the terrain in open terrain O-map - often featuresare represented with objects instead of contour lines  bad legibility

  24. Comparison of contour reliefs Conclusion positive negative • very precise position • accuracy - pseudo features DTM - dithering contour lines - completeness - representation without O-symbols - good for relief representation • only eliminate features, no new measuring Photogrammetricbase map - representation with O-symbol - inprecise - uncompleted - new measurements necessary

  25. Comparison of price Calculation for an area of 8km2 DTM DTM-AV: Basic charge Fr. 300.-- Fee per km2 8 x Fr. 80.-- = Fr. 640.-- Cut out, due of less than a 18 km2 tile Fr. 200.-- Subtotal cost of data DTM-AV Fr. 1140.-- Analysis DTM-AV wiht GIS-Tool 5h work 5 x Fr. 160.– = Fr. 800.-- Total Fr. 1940.--

  26. Comparison of price Calculation for an area of 8km2 Photogrammetric base map Models 5 x Fr. 100.-- = Fr. 500.-- Subtotal cost of data Fr. 500.-- Analysis 8km2Analysis 8 x Fr. 350.-- = Fr. 2800.-- Total Fr. 3300.--

  27. Preisvergleich DTM Photogrammetric base map Kostentotal Fr. 3300.-- Fr. 1940.--

  28. Conclusion Advantages of laser air borne scanning 1. Saving of time in the terrain because of its availability without interruption and precisness (elimination instead of measuring). 2. Raw-data all over Switzerland available. Time consuming work to find photogrammetric pictures are not any more necessary 3. Significant reduced costs compared to photogrammetric basemaps. 4. Data are available rapidly. 5. Combination with orthophotos possible (georeferenced) Disadvantages of laser air borne scanning 1. Basemap without O-set of symbol 2. A detailed contour relief could easily lead to an over crowded and badly generalized map image.

  29. Outlook Automatic generalization Hill shading perfect to represent the trail and track network

  30. Outlook Hill shading

  31. Outlook Automatic generalization Hill shading perfect to represent the trail and track network O-Map with hill shading

  32. Outlook O-map with hill shading

  33. Outlook Automatic generalization Hill shading perfect to represent the tail and treck network O-Map with hillshading Extraction ofcliffsout of the slope map

  34. Outlook Map hill slope

  35. Questions ?

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