Search found 4603 matches

by dbhguru
Sat May 02, 2020 7:53 am
Forum: California
Topic: Long time no post
Replies: 3
Views: 374

Re: Long time no post

John, We welcome you back into the fold. As of late, the BBS has been lightly visited, but it continues to serves as an archive for valuable big tree/tall tree information available nowhere else. We also continue to make progress on measurement methods, although that subject is of relatively minor i...
by dbhguru
Tue Apr 21, 2020 7:31 am
Forum: North Carolina
Topic: Walker Cove Big Ivy/Coleman Boundary NC
Replies: 38
Views: 6684

Re: Walker Cove Big Ivy/Coleman Boundary NC

Brian, You have amassed a highly valuable dataset on tall trees by site in the southern Appalachians. I encourage you to put it all together in a PDF organized by state and site. Basically, you are the only one left in the mountain South of an original strong southern team of tree measurers, and we ...
by dbhguru
Sat Apr 18, 2020 11:58 am
Forum: Measurement and Dendromorphometry
Topic: Canyon Comparisons
Replies: 0
Views: 362

Canyon Comparisons

Ents, For some measuring diversion, I've been looking at canyons on Google Earth with the intention of validating claims made by Internet posters about which is the biggest, deepest, etc. For extent, of course, the Grand Canyon wins, but one commonly reads that the deepest canyon in the contiguous U...
by dbhguru
Tue Apr 14, 2020 1:23 pm
Forum: Measurement and Dendromorphometry
Topic: Comparing instruments for measuring diameter
Replies: 8
Views: 1957

Re: Comparing instruments for measuring diameter

Ents, Periodically, I conduct comparison tests on instruments for DBH. The attached Excel workbook conducts 10 trials comparing DTape, calipers, reticle, and TP300. The results speak for themselves. The Bushnell Legend Ultra HD 10 x 42 monocular with range-finding reticle and a high performance dist...
by dbhguru
Mon Apr 13, 2020 1:00 pm
Forum: Measurement and Dendromorphometry
Topic: FIA-COLE volume model for Sequoias
Replies: 0
Views: 261

FIA-COLE volume model for Sequoias

Hi Ents, I just put together a volume Excel workbook for the giant sequoia using the FIA-COLE model that utilizes the FIADB and the past work of Jenkins and Raile plus other sources. Please see the attachment. The FIA-COLE model understates the volumes of the huge trees. I don't know how large the s...
by dbhguru
Sun Apr 12, 2020 11:11 am
Forum: Measurement and Dendromorphometry
Topic: Computing average radii for ellipse and comparing to a circle of same circumference
Replies: 0
Views: 235

Computing average radii for ellipse and comparing to a circle of same circumference

HI Ents, When we wrap a Tape around a trunk, we get the diameter of a circle that has the same circumference as the tape wrap. If perimeter of the trunk does to represent the circumference of a circle, i.e. the trunk isn't circular, what can we say about the diameter from the Tape? Some people think...
by dbhguru
Sun Apr 12, 2020 10:54 am
Forum: California
Topic: The concept of fire rotation...
Replies: 6
Views: 1211

Re: The concept of fire rotation...

Don,

Please give us more. One question I have is when we're talking about the chaparral on slopes, what is the prescription? Clearing the stuff opens the landscape up to more erosion doesn't it? So, what's to be done.

Bob
by dbhguru
Sat Apr 11, 2020 8:55 am
Forum: Measurement and Dendromorphometry
Topic: Just wanted to give an update...
Replies: 6
Views: 802

Re: Just wanted to give an update...

Folks, There are lots of issues around laser accuracy and instrument calibration and/or developing correction factors. As we would all likely recognize, each instrument has its own characteristics. If you've developed a correction factor and are satisfied with it, you still have the challenge of hit...
by dbhguru
Tue Apr 07, 2020 3:46 pm
Forum: North Carolina
Topic: Royal Gorge, Kitsuma Trail, Pisgah Nat'l Forest, NC
Replies: 33
Views: 6538

Re: Royal Gorge, Kitsuma Trail, Pisgah Nat'l Forest, NC

Brian,

At least it was documented when over 180. How many sites do we have with TTs over 180?

Bob
by dbhguru
Tue Apr 07, 2020 3:45 pm
Forum: New York
Topic: Letchworth State Park
Replies: 21
Views: 3368

Re: Letchworth State Park

Elijah,

Holy Toledo! You are unstoppable. Two NY sites with RHIs of 140 or higher. The pignut is a real find.Congratulations. We need to do an article for American Forests on the your and Erik's finds.

Bob

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