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LIDAR David Webb- VWCC

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Page 1: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

LIDAR

David Webb- VWCC

Page 2: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

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….

Page 3: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

LIDAR TypesAirborne

TopographicBathymeric

TerrestrialMobileStationary

Page 4: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

Stationary

http://trl.trimble.com/docushare/dsweb/Get/Document-421274/

Easter Island Moai

Page 5: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

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

Page 6: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

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

Page 7: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

LIDAR Attributes

Page 8: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

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

Page 9: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

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.

Page 10: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

Uses of LIDARFloodingCoastline erosion- changesVegetationForestryImproving accuracy and resolution of

basemaps.PlanningUrban Growth

Page 11: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

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/

Page 12: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

Why LIDAR?JamestownCivil War RedoubtsCoastal LIDAR

http://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~26954~1100253:Battery-Sawyer,-Va---Battery-Pruyn,

Page 13: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

Colonial ParkwayThree Civil War era forts.Document condition.Student service learning and fieldwork.

Page 14: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

Project

Page 15: David Webb- VWCC. LIDAR, LiDAR, LIDaR, lidar and LADAR(laser altimetry). Light detection and ranging Laser Imaging, Detection and Ranging Combining the

Colonial Parkway Redoubt Fort