LIDAR
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LIDAR David Webb- VWCC
description
LIDAR. David Webb- VWCC. LIDAR. 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…. LIDAR Types. Airborne Topographic Bathymeric - PowerPoint PPT Presentation
Transcript of LIDAR
LIDAR
David Webb- VWCC
LIDAR• 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….
LIDAR TypesAirborne
TopographicBathymeric
TerrestrialMobileStationary
Stationary
http://trl.trimble.com/docushare/dsweb/Get/Document-421274/
Easter Island Moai
LIDAR – Airborne TopographicActive 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
LIDAR ReturnsMultiple 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
ClassificationClassification 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 TypesLAS – 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 LIDARFloodingCoastline erosion- changesVegetationForestryImproving accuracy and resolution of
basemaps.PlanningUrban Growth
Find DataVirginia- William and Mary hosts state LIDAR
http://www.wm.edu/as/cga/VALIDAR/index.phpUSGS CLICK: Center for LIDAR Information
Coordination and Knowledge (not compressed!)http://lidar.cr.usgs.gov/
LIDAR LINKS for mappershttp://www.lidarbasemaps.org/
Why LIDAR?JamestownCivil War RedoubtsCoastal LIDAR
http://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~26954~1100253:Battery-Sawyer,-Va---Battery-Pruyn,
Colonial ParkwayThree Civil War era forts.Document condition.Student service learning and fieldwork.
Project
Colonial Parkway Redoubt Fort
