REMOTE SENSING WITH LIDAR Brian S. Keiling Program Head – Forest Management Dabney S.Lancaster Community College Class of 2010 - 2011 LIDAR - LIGHT DETECTION AND RANGING NEAR INFRARED BAND OF THE ELECTROMAGNETIC SPECTRUM RADAR – RADIO DETECTION AND RANGING MICROWAVE PORTION OF THE ELECTROMAGNETIC SPECTRUM LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the words light and radar LIDAR Active versus Passive Remote Sensing https://www.e- education.psu.edu/lidar/l1_p3.html LIDAR TYPES Airborne Topographic Bathymeric Terrestrial Mobile Stationary 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 BATHYMETRIC LIDAR • Blue –Green laser that can penetrate water and provide bottomland terrain modeling. • Water penetration down to 50 meters but clarity is a limiting factor. • Often flown simultaneously with digital cameras and hyperspectral sensors. MOBILE MAPPING WITH LIDAR Collection of 360 degree field of view Very accurate and highly precise data collection Provides detailed streetscape and roadway GIS data Ability to see where airborne lidar cannot MOBILE MAPPING STREETSCAPE Mobile mapping streetscape point cloud Finished streetscape from mobile mapping project https://www.e-education.psu.edu/lidar/l9_p5.html STATIONARY Easter Island Moai http://trl.trimble.com/docushare/dsweb/Get/Document-421274/ 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 LIDAR ATTRIBUTES CLASSIFICATION Classification Value Classification Type 0 Never Classified 1 Unassigned 2 Ground 3 Low Vegetation 4 Medium Vegetation 5 High Vegetation 6 Building 7 Noise 8 Model Key 9 Water 10 Reserved for ASPRS Definition 11 Reserved for ASPRS Definition 12 Overlap 13–31 Reserved for ASPRS Definition 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/ 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. USES OF LIDAR Flooding Coastline erosion- changes Vegetation Forestry Improving accuracy and resolution of basemaps. Planning Urban Growth 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.org/ LIDAR AVAILABILITY IN VIRGINIA NASA – TREE INVENTORY AND GIS UTILIZING LIDAR FOR TREE ASSESSMENT Student service learning project. VWCC, TNCC and DSLCC Tree inventory and analysis as part of a Geospatial Technology project Student participation from both GIS and Forestry disciplines NASA TREE INVENTORY AND GIS Google Earth Image Lidar point cloud classified with elevation of the return. NASA TREE INVENTORY AND GIS State Record Sassafras NASA – TREE INVENTORY NASA TREE INVENTORY NASA TREE INVENTORY Utilizing the point cloud to provide tree canopy width measurements NASA TREE INVENTORY Utilizing the point cloud to provide tree height measurements SELECTING MUTIPLE TREES WITH LIDAR OSO WASHINGTON MUDSLIDE http://seattletimes.com/ABPub/zoom/html/ 2023244527.html AERIAL VIEW OF SLIDE http://www.bbc.co.uk/newsround/26731774 LIDAR IMAGERY OF OSO SLIDE http://www.arcgis.com/home/webmap/viewer.ht ml?useExisting=1&layers=62a2c2dbb4434b31b 9a3ead595b5a0ae NASA TREE INVENTORY Questions?