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Land Use Detection


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Land Use Detection

  1. 1. Zhaoying Wei GEOG 8350 Comparison of Land use detection in Niagara Falls using LIDAR and orthoimagery
  2. 2. Outlines  Goal  Area of Interest  Data  Method and Result  Conclusion and Future Work
  3. 3. Land use detection orthophoto LIDAR Goal
  4. 4. AOI
  5. 5. Data Data • point cloud Lidar data • orthoimagery Tools •LAStools •Lidar Analyst •ArcGIS 10.0 • ArcGIS 10.0 • Erdas • ENVI
  6. 6. Method (LIDAR)  Extract Bare earth • strip the existing classes from the LAS file and set the coordinate system and projection (noclass.las) • classify the ground points (ground.las) • create the only ground points (groundonly.las) • generate DEM of groundonly .las • extract bare earth DEM from groundonly DEM
  7. 7. Method (LIDAR) From From raw LAS  Extract Bare earth
  8. 8. Method (LIDAR) Extract buildings footprints • compute the height above the ground • Classify trees and Buidlings (treeNbuilding.las) • generate new bare earth for building and trees extraction
  9. 9. Extract building footprints • point cloud building extraction Method (LIDAR)
  10. 10. Extract building footprints • edit building Method (LIDAR) Before After Remove building Add to building Merge building
  11. 11. Before After Extract building footprints Method (LIDAR) Create new building and close holes Final footprints
  12. 12. Extract tree • point cloud tree extraction • visually edit forests and trees Method (LIDAR)
  13. 13. Method (Orthophoto) Supervised classification • Create the signature file and AOI for each class • Combine the signature file of all classes
  14. 14. Method (Orthophoto) Reclassify • manually digitize AOI • assign new class value to water
  15. 15. Conclusion  LIDAR: • vector results consistent with real terrains • limited classes Orthoimage • numerous classes • low quality and accuracy, water
  16. 16. Future work Measure accuracy of the classification result  improve the quality of signature  better water detection  object-based classification Fusion of LIDAR and aerial image