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Using LIDAR DEMs with ArcView Spatial and 3D Analysts

Workshop Outline. Project OverviewData Collection and ProcessingDescription of DatasetsInternet Access to DataExercisesData Import and VisualizationInformation extraction3D Visualization (Time Permitting)Q

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Using LIDAR DEMs with ArcView Spatial and 3D Analysts

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    2. Workshop Outline Project Overview Data Collection and Processing Description of Datasets Internet Access to Data Exercises Data Import and Visualization Information extraction 3D Visualization (Time Permitting) Q&A

    3. Scope LIDAR data acquisition Storm Surge Model Comparison Computer Animation Public awareness/education Participating Counties Broward Palm Beach Miami-Dade Manatee FEMA Windstorm Simulation and Modeling Program

    4. FIU/UF LIDAR System Optech 1210 ALTM system Delivered March 1999 Mounted in Cessna 337 twin-engine aircraft System and aircraft jointly owned by FIU/IHC and UF Geomatics program Upgraded to model 1233 in 2002

    5. OPTECH 1233 Features 330 - 2000 m operating altitude 33 kHz laser repetition rate to +/- 20 degrees scan angle , 30 Hz scan rate 10 - 30 cm spot diameter 10 - 50 cm RMS vertical accuracy (depending on swath width) Returns first, last range; reflection intensity

    8. GPS Ground Station

    9. LIDAR Measures Objects From Line of Sight

    10. Cloud of Returns

    12. Terrain Filtering of Irregularly Spaced Points

    13. Gridded Top Surface and Bare Earth DEMs

    14. Data Processing Steps Compute Aircraft Trajectory from GPS Calculate XYZ of laser points Merging and tiling of swaths Remove vegetation and other features Gridding and interpolation Validation and inspection of results

    15. Processing Flow

    16. Datasets Strip Data 9 column ASCII text files (T,x1,y1,z1,i1,x2,y2,z2,i2) 5000x5000 ft Tiles Unfiltered 1st return data (Top Surface) X,Y,Z points (ASCII text) 5 ft DEMs (Binary Grids) Filtered Last return data (Bare Earth) X,Y,Z points (ASCII text) 5 ft DEMs (Binary Grids) Subaveraged Bare Earth DEM Mosaic Tiles mosaiced and subaveraged to 100 ft postings

    17. Tile Organization Points

    18. Tile Organization Grids

    19. Internet Access Allows selection and download of data in single or multiple tiles Uses ARC IMS Technology Still under construction URL: http://gis.ihc.fiu.edu/website/lidar

    20. Exercises

    21. Materials on CD Sourcedata ?Materials used in exercises 5 ft Top surface and Bare earth DEMs 1 ft orthophotos (TIF images) Scripts, legends, shapefiles used in exercises Samples ? other materials Compressed (gzip) Strip file, point tiles Subaveraged 100 ft grids, Broward, Palm Beach Co. Vertcon94e.asc ? VERTCON model for SE U.S. (in DD) Used to transform between NGVD29 and NAVD88 Z88 = Z29 + VERTCON Br_pb_tileindex_dd.shp

    22. Overview of Exercise 1: Data Import and Visualization Load ArcView extensions and set working directory Import binary raster DEM files to GRIDs Visualization: Color shaded relief images Create 1 ft. contours Overlay 1 ft orthophotographs

    23. Overview of Exercise 2: Information Extraction Point query and extraction Gridspot.ave script Extracting elevation profiles Interpolate Line, Profile Graph tools Extracting zonal statistics within polygons Summarize Zones tool

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