Revisiting Crown Area

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

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#11)  Re: Revisiting Crown Area

Postby Don » Mon Feb 25, 2013 2:33 am

Bob-
While reading a MacLife magazine, I ran across an intriguing app/attachment for an iPhone.
Check out

www.prexiso.com
or
http://www.prexiso.com/en/prexiso-ic4_221.htm

It's application is in home, but it doesn't take too much of our imagination to envision an outdoors model.  Just a teaser!
-don
Don Bertolette - President/Moderator, WNTS BBS
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Science Center
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#12)  Re: Revisiting Crown Area

Postby dbhguru » Mon Feb 25, 2013 9:17 am

Don,

    The number of devices that measure for us seems to be exploding. Who'd a thunk it? I'm pleased with the iPhone apps SeeLevel and its use of the iPhone camera(it can serve as a densitometer) and I also like their SeeCompass. I'm less sure about the much touted Spyglass app. It gets rave reviews, but the screen is so busy and the characters are so small, I can't read the returns. It's not a matter of practice or new glasses. I need new eyes.

    So let's see, as dendromorphometrists, what do we have in our measuring kit these days?

   (1) Infrared laser rangefinder
   (2) Red beam industrial laser
   (3) Inclinometer
   (4) Compasses -old fashion and digital
   (5) Hypsometer combining (1) and (3) or (1), (3), and (4)
   (6) Reticle monocular
   (7) Regular tape measure
   (8) D-Tape
   (9) Plumb bob
   (11) Tripod
   (12) Flagging tape
   (13) Calipers
   (14) Biltmore stick
   (15) Digital camera
   (16) Reflectors
   (17) Dendrometer
   (18) Relascope
   (19) Scientific calculator
   (20) GPS receiver
   (21) Computer software

- OR-

   (22) An iPhone 4 or later with abundant apps that do the jobs of most of the above.
 
 Have I left anything out?  Probably, but all the beginner really needs is the laser rangefinder, inclinometer, tape, and scientific calculator, -OR- increasingly, the iPhone. Ah, life is sooo good when we have lot's of neat gizmos to play with, or an iPhone. Who'd a thunk it?

Bob
Robert T. Leverett
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Native Native Tree Society
Co-founder and President
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#13)  Re: Revisiting Crown Area

Postby dbhguru » Wed Feb 27, 2013 11:29 am

NTS,

   Attached is the 4th method for measuring crown area. The measurer walks the perimeter shooting horizontal distances and azimuth to the next point until the the crown's perimeter is circled. The measurer does not interact with the trunk or any internal point of the polygon. I'll soon begin working on error correction processes implemented on an as you go protocol. Error correction will increase the required labor if implemented. However, at its most basic, this is the simplest and most flexible method of the four.

Bob
Attachments
AreaAzimuthTapeClinometerCompass-4.xls
Saved as an older format xls file - I am not sure if any functionality has been lost. -Ed
(628.5 KiB) Downloaded 20 times
AreaAzimuthTapeClinometerCompass-4.xlsm
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Robert T. Leverett
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Native Native Tree Society
Co-founder and President
Friends of Mohawk Trail State Forest
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