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