James, Mine does't. I don't know if it is just my particular instrument.
Bob Sent from my iPhone On Jan 3, 2010, at 11:43 PM, James Parton <[email protected]> wrote: > Bob, > > The Nikon Forestry 550 sounds cool. Does it penetrate through > foreground clutter anywhere near as good as the Nikon 440 does? > > JP > > On Jan 3, 3:19 pm, [email protected] wrote: >> Carolyn, >> >> The Nikon Forestry 550 does it all. It is also fairly pricey. You >> select the height mode, shoot the crown, shoot the base, and read >> the calculated height from the LED. No math. No fuss. No bother. >> >> Bob >> >> >> >> ----- Original Message ----- >> From: "Carolyn Summers" <[email protected]> >> To: [email protected] >> Sent: Sunday, January 3, 2010 2:35:23 PM GMT -05:00 US/Canada Eastern >> Subject: Re: [ENTS] Suunto vs. iPhone >> >> Are there any tree-height measuring devices that do the math for >> you? I >> never took trig. >> -- >> Carolyn Summers >> 63 Ferndale Drive >> Hastings-on-Hudson, NY 10706 >> 914-478-5712 >> >>> From: Beth <[email protected]> >>> Reply-To: <[email protected]> >>> Date: Tue, 22 Dec 2009 15:57:09 -0800 (PST) >>> To: ENTSTrees <[email protected]> >>> Subject: [ENTS] Suunto vs. iPhone >> >>> A Small Comparison between Suunto and iPhone Clinometers >> >>> Since some of us now have iPhones and have downloaded the >>> Clinometer application I thought that someone needs to compare the >>> iPhone to the Suunto clinometer. Today I took 14 measurements each >>> while sitting on my couch to a ceiling heating/AC vent. I then >>> measured my eye height, the ceiling height, and the distance from my >>> eyes to the tape measure hanging from the vent as a plumb bob. These >>> measurements were: ceiling height = 96², height of the eyes = 38 >>> ², and >>> distance to the vent plum bob = 219². I used the measurements to >>> calculate the angle I was trying to measure with the Suunto and >>> iPhone. Before taking my measurements I calibrated my iPhone >>> clinometer according to the instructions. I also had the following >>> settings: Fast approximation-on, Beep on lock-on, wait for lock >>> accuracy of + 0.1o- all the way to the left (+ 0.1o), disable auto- >>> lock-off, and 3D glass effect-on. >> >>> The first thing that I do in order to calculate the angle A was to >>> calculate the distance from my eye to the ceiling; 96²-38²= 58². >> >>> Since Tan A = a/b, we can rearrange the equation to find A by >>> dividing >>> both sides by Tan. Since 1/Tan =Arc Tan the equation is A = (a/b) >>> Arc >>> Tan. Filling in this equation with the data we get A = (58/219) Arc >>> Tan or A = 14.8336707057. Taking signifiginte numbers in mind I am >>> going to say the angle is 14.8o. (Note: I calculated this after >>> gathering the data as not to influence the clinometer data) >> >>> Now for the clinometer data: >>> Suunto iPhone Suunto iPhone >>> 15.5 15.2 14.5 15.4 >>> 15.0 14.9 15.0 15.2 >>> 15.0 15.1 14.5 15.2 >>> 15.0 14.1 14.5 15.1 >>> 15.0 15.0 14.5 15.7 >>> 15.0 15.2 15.0 15.5 >>> 14.5 15.1 14.5 15.2 >>> The means were 14.8 and 15.1 for the Suunto and iPhone respectively >>> with standard deviation of 0.31 and 0.35. >> >>> The one thing I noticed in my raw data is with the Suunto my highest >>> and lowest angles were 15.5 and 14.5 whereas with the iPhone they >>> were >>> 15.7 and 14.1. I can think of at least two reasons why. 1) I have >>> more experience with the Suunto than I have with the iPhone and 2) >>> the >>> Suunto has a line to help repeatly ³hit² the same spot whereas the >>> iPhone you are just looking down one side of the phone. >> >>> I also noticed after calculating the angle (14.8) the Suunto average >>> was closer than the iPhone¹s (14.8 vs. 15.1). Now is 0.3o differ >>> ence >>> significant? Bob has more experience with the Suunto than I do and >>> he >>> has stated in the past that can read it to the nearest 1Ž4 o. I >>> myself >>> can only read it to the nearest 1Ž2o. Given this I believe that a >>> difference of 0.3o is. >> >>> How can the iPhone be improved? If one would add a sighting device >>> on >>> to the iPhone this could help ³hit² the same spot repeatly. Obvi >>> ously >>> this can not be same one that is used in the Suunto¹s, looking t >>> hrough >>> it with an optical illusion. Maybe a tiny gun sighting built into >>> the >>> volume and/or ringer buttons on the left side. I think someone >>> thought of this earlier. With the sight and practice I believe one >>> could the angle down to the nearest tenth of a degree. With the >>> Suunto one can only really estimate anything less than 1 degree. >>> Beth >> >>> -- >>> Eastern Native Tree Societyhttp://www.nativetreesociety.org >>> Send email to [email protected] >>> Visit this group athttp://groups.google.com/group/entstrees?hl=en >>> To unsubscribe send email to [email protected] >> >> -- >> Eastern Native Tree Societyhttp://www.nativetreesociety.org >> Send email to [email protected] >> Visit this group athttp://groups.google.com/group/entstrees?hl=en >> To unsubscribe send email to entstrees >> [email protected] Hide quoted text - >> >> - Show quoted text - > > -- > Eastern Native Tree Society http://www.nativetreesociety.org > Send email to [email protected] > Visit this group at http://groups.google.com/group/entstrees?hl=en > To unsubscribe send email to [email protected] -- Eastern Native Tree Society http://www.nativetreesociety.org Send email to [email protected] Visit this group at http://groups.google.com/group/entstrees?hl=en To unsubscribe send email to [email protected]
