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David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the.

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Presentation on theme: "David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the."— Presentation transcript:

1 David Webb- VWCC

2 LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the words light and radar My most common thought about the subject….

3 LIDAR Types Airborne Topographic Bathymeric Terrestrial Mobile Stationary

4 http://trl.trimble.com/docushare/dsweb/Get/Document-421274/ Easter Island Moai

5 LIDAR – Airborne Topographic Active Remote Sensing method. Laser pulses are reflected from objects on or near the ground. XYZ data collected. High density of data points collected. http://www.fs.fed.us/pnw/pubs/pnw_gtr768.pdf

6 LIDAR Returns Multiple returns. First is the highest object. Up to five (5) returns per pulse. Last is not always the ground. http://resources.arcgis.com/en/help/main/1 0.1/index.html#//015w00000041000000

7 LIDAR Attributes

8 Classification Classification ValueClassification Type 0Never Classified 1Unassigned 2Ground 3Low Vegetation 4Medium Vegetation 5High Vegetation 6Building 7Noise 8Model Key 9Water 10Reserved for ASPRS Definition 11Reserved for ASPRS Definition 12Overlap 13–31Reserved for ASPRS Definition

9 File Types LAS – specification for a point cloud file format with x,y,z and other attributes. ASCII – original format for LIDAR data. LAZ – lossless LIDAR Compression. http://www.laszip.org/ http://www.laszip.org/ Data we will use compressed from 164 mb to 29 mb. LAS Dataset –LAS storage for use in ArcGIS. Convert into TIN, DEM, contours and others.

10 Uses of LIDAR Flooding Coastline erosion- changes Vegetation Forestry Improving accuracy and resolution of basemaps. Planning Urban Growth

11 Find Data Virginia- William and Mary hosts state LIDAR http://www.wm.edu/as/cga/VALIDAR/index.php USGS CLICK: Center for LIDAR Information Coordination and Knowledge (not compressed!) http://lidar.cr.usgs.gov/ LIDAR LINKS for mappers http://www.lidarbasemaps.orghttp://www.lidarbasemaps.org/

12 Why LIDAR? Jamestown Civil War Redoubts Coastal LIDAR http://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~26954~1100253:Battery-Sawyer,-Va---Battery-Pruyn,

13 Colonial Parkway Three Civil War era forts. Document condition. Student service learning and fieldwork.

14 Project

15 Colonial Parkway Redoubt Fort

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