Search found 173 matches

by pdbrandt
Sun Apr 13, 2014 11:09 am
Forum: Eastern United States, Canada, and Greenland
Topic: Why big trees? My personal story.
Replies: 11
Views: 5489

Re: Why big trees? My personal story.

Johnny, Thanks for taking the time to put your thoughts into words and sharing them. You got me thinking about why I'm so passionate about trees. I don't know that I can really give a logical reason for my interest in trees, but here's my best attempt: I've always loved nature, the outdoors, and esp...
by pdbrandt
Wed Apr 02, 2014 2:20 pm
Forum: Remote Sensing, LIDAR, and GIS
Topic: Lidar Data viewing on a Mac?
Replies: 2
Views: 1120

Re: Lidar Data viewing on a Mac?

QGIS is open source GIS software that runs on Mac or PC. I use it on Mac. For me there was a steep learning curve, but I had no experience with GIS software before.

http://www.qgis.org/en/site/
by pdbrandt
Wed Apr 02, 2014 8:04 am
Forum: Measurement and Dendromorphometry
Topic: Comparing tape drop height to that obtained with Nikon 440
Replies: 11
Views: 4194

Re: Comparing tape drop height to that obtained with Nikon 4

dbhguru wrote: I encourage you to send a Word version of your post to Dr. Don Bragg for inclusion in a future edition of the Bulletin of the Eastern Native Tree Society.
I'd be glad to, Bob. I will try to send it to Don via a PM.
by pdbrandt
Wed Apr 02, 2014 8:01 am
Forum: Measurement and Dendromorphometry
Topic: Comparing tape drop height to that obtained with Nikon 440
Replies: 11
Views: 4194

Re: Comparing tape drop height to that obtained with Nikon 4

mdvaden wrote:
Now, it's not the NIkon, but Taylor and I used the Impulse 200 LR for the world's tallest pine that's close to 268' tall, and I recall the tape drop differing from our laser measurement by 1 or 2 millimeters.
Wow! That is impressive for a ground based measurement!
by pdbrandt
Wed Apr 02, 2014 7:56 am
Forum: Measurement and Dendromorphometry
Topic: Comparing tape drop height to that obtained with Nikon 440
Replies: 11
Views: 4194

Re: Comparing tape drop height to that obtained with Nikon 4

Patrick, Cool study! I've thought of doing something similar using a pedestrian bridge or a fire tower, but haven't found anything quite tall enough, so it's really cool to see these results. I know what you mean about not always being able to utilize click-over when only small windows to shoot thr...
by pdbrandt
Wed Apr 02, 2014 7:02 am
Forum: Measurement and Dendromorphometry
Topic: Comparing tape drop height to that obtained with Nikon 440
Replies: 11
Views: 4194

Re: Comparing tape drop height to that obtained with Nikon 4

When a mechanical clinometer is out of calibration, it is often off either on the high or low side by some amount such as a quarter or half a degree, i.e. the direction of the error stays the same whether pointing the instrument up or down. If a clinometer reads high, it means that the clinometer's...
by pdbrandt
Tue Apr 01, 2014 6:58 am
Forum: Measurement and Dendromorphometry
Topic: Comparing tape drop height to that obtained with Nikon 440
Replies: 11
Views: 4194

Re: Comparing tape drop height to that obtained with Nikon 4

Excellent! I'm pretty darn sure all those hemlocks were from the Tsuga Search project and measured via Nikon 440. When Jess and I found a superlative hemlock we would monument mid slope with a thumbtack and then use it for the tape drop. This way the same base is used. Will, That would explain why ...
by pdbrandt
Mon Mar 31, 2014 2:47 pm
Forum: Measurement and Dendromorphometry
Topic: Comparing tape drop height to that obtained with Nikon 440
Replies: 11
Views: 4194

Comparing tape drop height to that obtained with Nikon 440

This post ended up being much longer than I imagined - my apologies to the casual reader! Tape drop is considered the definitive measure of a tree's exact height, but climbing a tree to measure its height is usually not feasible. Don Bragg, Lee Frelich, Bob Leverett, Will Blozan and Dale Luthringer ...
by pdbrandt
Tue Mar 25, 2014 4:31 pm
Forum: New York
Topic: Washington Grove City Park, NY
Replies: 51
Views: 13289

Re: Washington Grove City Park, NY

TP1 - The tallest tree in the grove at 122.2' https://lh6.googleusercontent.com/-4FIyt_GPFaY/Uy33PgFURfI/AAAAAAAACWQ/i44yDB2oOVs/w225-h576-no/TP1.jpeg TP2 https://lh6.googleusercontent.com/-t4f9Qukprbs/Uy33PiIpchI/AAAAAAAACWI/tD8gjPm7t0o/w196-h576-no/TP2.jpeg TP3 - a prominent tree with balding trun...
by pdbrandt
Tue Mar 25, 2014 4:30 pm
Forum: New York
Topic: Washington Grove City Park, NY
Replies: 51
Views: 13289

Re: Washington Grove City Park, NY

As I got close to Washington Grove I knew I was in for a treat when I began to see street trees like this one: https://lh3.googleusercontent.com/-igKN6gMLoOU/Uy33VJV9ovI/AAAAAAAACYE/cnLpelZ2bAM/w430-h576-no/steet+tree.jpg I spent about 4 hours in the Washington Grove, but alas it was not enough time...

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