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Laser Range Finders (LRF)

Although there have been dramatic improvements in GPS under dense canopy or in deep canyons common

to Forest Service field environments, laser range finders, sometimes called laser instruments or laser guns,

offer an alternative by rapidly obtaining measurements of features without physically occupying them.

Laser range finders are useful for mapping signs, utility poles, trees, topography, or other remote features.

Features are mapped in a matter of seconds by simply aiming and triggering the instrument from a known

point. Raw measurements from the instrument s sensors (distance, inclination, and azimuth) may be reduced

to three-dimensional coordinates by a computer connected to the instrument via an RS-232 interface.

Laser mapping instruments have different features and capabilities, and as such, will influence factors such

as accuracy, minimum and maximum range, durability, and utility. They are typically hand-held devices, with

an aiming scope, that record distance by measuring the time it takes laser light to travel to a target and reflect

to a receiving diode in the instrument. A series of measurements is taken and statistically averaged to obtain

the reading. Higher-priced models may include additional sensors that measure tilt (inclination) and an

electronic compass for measuring azimuth, the angle referenced from magnetic north. This gives laser

instruments qualities similar to total stations, and gives them the ability to provide the three-dimensional

coordinates of a feature based on a known point.

Company and Product

Georeferenced Raster Maps

Scales

Type

Media Price

Maptech

800-627-7236

http://www.maptech.com

1:24,000

1:100,000

DRG

CD-ROM

$295-$975

QuadsUSA, Inc.

888-288-7823

http://www.quadsusa.com

1:24,000

1:100,000

1:250,000

DRG

CD-ROM

Sure!Maps RASTER

Horizons Technology

800-828-3808

http://www.horizons.com/suremaps

1:24,000

1:100,000

1:250,000

DRG

CD-ROM

Internet

$250 per county

$15 per quad (Internet)

Sylvan Ascent, Inc.

TopoDepot

800-362-8971

http://www.sylvanmaps.com/

1:24,000

DRG

CD-ROM

Internet

$695 per state

$149 per county

U.S. Geologic Survey (USGS)

888-275-8747

http://www.usgs.gov

1:12,000 (DOQ)

1:24,000 (DRG)

DRG

DOQ

CD-ROM

CD-R

Internet

$1/ per file + $45 (CD-ROM)

$1/ per file + $30 (Internet)

$32+10/add. CD-R (DOQ)

DRG Digital Raster Graphic

DOQ Digital Orthographic Quadrangle

Georeferenced Raster Maps

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