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by dbhguru
Tue Aug 06, 2019 7:06 am
Forum: Special Lists
Topic: County Rucker Index
Replies: 24
Views: 2856

Re: County Rucker Index

Jared,

No, unfortunately, I haven't. I may try to do that. Franklin, Hampshire, and Berkshire will be up there. Hampden maybe not as much. So many trees, so little time.

Bob
by dbhguru
Sat Aug 03, 2019 2:47 pm
Forum: Special Lists
Topic: County Rucker Index
Replies: 24
Views: 2856

Re: County Rucker Index

Brian, Spectacular list! Great job putting it together. I presume the 191.9-foot tall tulip is in Swain Co. Mark, The 207-foot Boogerman Pine was originally measured by Will Blozan and me. We used crown point cross-triangulation. Will spotted where we thought a plumb line from the top would touch th...
by dbhguru
Tue Jul 30, 2019 12:46 pm
Forum: Measurement and Dendromorphometry
Topic: Extending reticle testing
Replies: 2
Views: 658

Re: Extending reticle testing

Ents,

Below are the results of a reticle test conducting this morning. I was going that extra yard. Reticle measurements rule.

ReticleTest.png
Bob
by dbhguru
Mon Jul 22, 2019 8:27 pm
Forum: Massachusetts
Topic: Catching up
Replies: 15
Views: 1399

Re: Catching up

Jared,

No, I haven’t included the Pelham tree. Thanks for reminding me. In terms of valley elevation, I’m open to suggestions on how to define the boundaries. The Pelham Hills have elevations in the 1,000 to 1,300 foot range. Does the tree grow on a building ridge line?

Bob
by dbhguru
Mon Jul 22, 2019 7:10 am
Forum: General Discussions
Topic: Where Are We Going?
Replies: 2
Views: 393

Where Are We Going?

Ents, Periodically, one of us pauses and asks where are we in NTS. I guess I'll come forward and do that. We've been at low ebbs before and came back, but this time, it feel its different. Maybe I'm just being pessimistic, but we've been at the game of hunting, measuring, and reporting on outstandin...
by dbhguru
Mon Jul 22, 2019 6:49 am
Forum: Pennsylvania
Topic: Who wants to check out a big Chestnut Tree?
Replies: 5
Views: 597

Re: Who wants to check out a big Chestnut Tree?

Ents,

This is a job for the Ents in PA. Hope somebody is reading this.

Bob
by dbhguru
Fri Jul 19, 2019 7:31 am
Forum: Measurement and Dendromorphometry
Topic: Extending reticle testing
Replies: 2
Views: 658

Extending reticle testing

Ents, I've been discussing the various formulas for measuring the width of a target with a monocular with range-finding reticle with Eric Wiseman, VA champion tree program coordinator, Cadre member, and an associate professor of urban forestry at VA Tech. The value of the reticle pretty clear, but j...
by dbhguru
Sun Jul 14, 2019 6:49 am
Forum: Measurement and Dendromorphometry
Topic: An excel formula for the SOLO R/T?
Replies: 4
Views: 734

Re: An excel formula for the SOLO R/T?

John, If you are measuring tree trunk diameters that are reasonably circular, you can get by with a single formula. W = MD/(F-0.5M) where M = reticle reading, D = distance to middle of trunk, and F = reticle factor, which should be 1000 for the Solo RT 8x36. The bigger the tree, the more important t...
by dbhguru
Sat Jul 13, 2019 11:14 am
Forum: Measurement and Dendromorphometry
Topic: An excel formula for the SOLO R/T?
Replies: 4
Views: 734

Re: An excel formula for the SOLO R/T?

John, Alas, Excel formulas abound. I guess that we have so much material on the BBS that searching for an answer to a specific question can be daunting. Here are some relevant BBS posts on the reticle: Measurement & Dendromorphometry : Reticle Testing – Mon Oct 23, 2017, latest post Feb 18, 2018. Me...
by dbhguru
Tue Jul 09, 2019 7:54 am
Forum: Measurement and Dendromorphometry
Topic: limb and tree measurement
Replies: 9
Views: 1067

Re: limb and tree measurement

Rick, Here is the source of the 0.5M factor. Derivation.png So, you can see that if the target is truly circular, the adjustment is mathematically provable. I have an Excel workbook that offers eight reticle methods and their mathematical derivations. The workbook is 4.5 Mbytes, so I don't like to p...

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