Download - Remote sensing with LIDAR
REMOTE SENSING
WITH
LIDARBrian S. Keiling
Program Head – Forest Management Dabney S.Lancaster Community College
Class of 2010 - 2011
LIDAR - LIGHT DETECTION AND RANGINGNEAR INFRARED BAND OF THE ELECTROMAGNETIC SPECTRUM
RADAR – RADIO DETECTION AND RANGINGMICROWAVE PORTION OF THE ELECTROMAGNETIC SPECTRUM
LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry).Light detection and rangingLaser Imaging, Detection and RangingCombining the words light and radar
LIDAR
https://www.e- education.psu.edu/lidar/l1_p3.html
Active versus Passive Remote Sensing
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
http://trl.trimble.com/docushare/dsweb/Get/Document-421274/
Easter Island Moai
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/10.1/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 measurement
s
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.html?useExisting=1&layers=62a2c2dbb4434b31b9a3ead595b5a0ae
NASA TREE INVENTORY
Questions?