Just wanted to give an update...

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

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ryandallas
Posts: 115
Joined: Fri Mar 07, 2014 5:23 pm

Just wanted to give an update...

Post by ryandallas » Sat Feb 22, 2020 2:59 pm

My fellow eNTS,

I've been posting more frequently lately, and my posts have included measurements from an instrument, a hypsometer, which I believed was accurate. However, I recently switched back to the old ProStaff + Clinometer combo, and it looks like the hypsometer might have been inflating some measurements. In keeping with the spirit of the NTS, I am going to remove data that I believe is exaggerated. The exaggerations were not way out there. Maybe in the neighborhood of 3-4 feet. Still, that is excessive for this group, so I will be removing some posts.

I just want to say that during my time as an Ent, I have never posted data with the intention to mislead, etc. All of the data I have posted, however accurate or inaccurate, was posted in good faith. To do otherwise would be to do a disservice to this organization.

I will be working with the administrators on this.

Take care,

Ryan

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dbhguru
Posts: 4470
Joined: Mon Mar 08, 2010 9:34 pm

Re: Just wanted to give an update...

Post by dbhguru » Sat Feb 22, 2020 9:00 pm

Ryan,

I will personally vouch for you. No need to explain further. BTw, what hypsometer were you using.

Bob
Robert T. Leverett
Co-founder, Native Native Tree Society
Co-founder and President
Friends of Mohawk Trail State Forest
Co-founder, National Cadre

ryandallas
Posts: 115
Joined: Fri Mar 07, 2014 5:23 pm

Re: Just wanted to give an update...

Post by ryandallas » Sat Feb 22, 2020 10:46 pm

Thanks, Bob. That means a lot. Just a run down of some issues:

The Mt. Laurel TT (Fairfield) was 148' measured with Prostaff and clinometer, not 152' as I previously reported. So unfortunately Fairfield is no longer in the 150+ club.

The great Allens Meadows Tree, which is one of the most impressive specimens I know of, is not a contender for 160'. It is 155.4' tall. I previously put it down at 158'.

There are some other things I have to change, too.

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ElijahW
Posts: 812
Joined: Sun Jun 26, 2011 4:04 pm

Re: Just wanted to give an update...

Post by ElijahW » Sun Feb 23, 2020 6:21 pm

Ryan,

Don’t get too down on yourself. You’re doing the right thing by repeating your measurements and noting differences in equipment performance. I’ve gone through the same process myself and shared some of my results on the BBS.

To get a better handle on the accuracy of your hypsometer and/or laser rangefinder, I would suggest calibrating them. Verifying angles can be a little tricky, but checking distances is pretty straightforward: compare the readings obtained from controlled laser shots to a reflective target to the target’s actual known distance. The last time I calibrated my Trupulse (a while ago now) I used a long measuring tape for distance and a Suunto clinometer to check the angle.

My Nikon 440 generally shot about a foot long, but was very reliable and easy to use. The Suunto clinometer is also a great product, especially when mounted on a tripod. What hypsometer were you using?

Elijah

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