30 ft. Prism Pole

General discussions of measurement techniques and the results of testing of techniques and equipment.

Moderators: edfrank, dbhguru

Post Reply
User avatar
Posts: 882
Joined: Tue Sep 07, 2010 6:30 pm

30 ft. Prism Pole

Post by mdvaden » Tue Apr 01, 2014 10:57 pm

Wonder if Michael Taylor is going to snicker at me when he sees this. I emailed recently about possibly using fiberglass poles most often used for pole pruning saws and BIGSHOTS to set climbing lines, to raise a prism.

The thought was exclusive to like Coast Redwood forest, or similar, where there's very tall vegetation or small trees in front of a trunk. And maybe trying the pole for a single measurement instead of leap-frogging 1/2 dozen or more times on hills or through dense areas.

I could hold it straighter. Had to run for a 10 second timer and leaned it so it would not fall. From what I tried, the prism has to rest against the trunk, else it will sway too much for a laser to lock-on.
M. D. Vaden of Oregon = http://www.mdvaden.com

200 Pages - Coast Redwoods - http://www.mdvaden.com/grove_of_titans.shtml

Portraits & Weddings - http://www.vadenphotography.com

User avatar
Posts: 1560
Joined: Tue Mar 09, 2010 12:42 am

Re: 30 ft. Prism Pole

Post by Don » Mon Jul 07, 2014 4:20 pm

In a previous career (while working way through college), I was a surveyor and towards the end of that time, electronic distance meters had begun to tease land surveyors. While that application would tend towards having a 2.5 inch parabolic reflector, a triple, or a triad (triple triple) of parabolic reflectors, one forestry application was using LaserTech International's Criterion 300 (this was in the early 90's) laser and a 1 inch hand held reflector, to traverse around treatment units.
Between the two careers, it wasn't hard to see the use of a 25' telescoping fiberglass pole (with proper fitting on top) and a reflector for distant shots, or shots in uneven topography.
They do get wiggly up there, don't they...
Don Bertolette - President/Moderator, WNTS BBS
Restoration Forester (Retired)
Science Center
Grand Canyon National Park

BJCP Apprentice Beer Judge

View my Alaska Big Tree List Webpage at:

Post Reply

Return to “Measurement and Dendromorphometry”