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?