Only early prototypes used the sine method. None were sold commercially with the sine method.
Paul On Thu, Jan 7, 2010 at 2:45 PM, DON BERTOLETTE <[email protected]>wrote: > Paul/Bob- > THanks for the inside line on this! > I wonder how far back it was when they switched from older version? I've > had mine for about five years now. > -Don > > ------------------------------ > Date: Thu, 7 Jan 2010 09:18:05 -0600 > Subject: Re: [ENTS] OPTILOGIC > From: [email protected] > > To: [email protected] > > Bob, Don, > > When they first came out, I sent an email to Optilogic asking about it's > operation. The response that I got was essentially the following: > > The original design prototypes used the 2-point sine method. However, > field testing by the USFS showed that the laser had problems effectively > shooting through to the tops in all cases. As a result, the USFS requested > a change to the 3-point tangent method to work around the occasional > shoot-through issue. At the time, the older version of firmware was still > available, and units could be reprogrammed with the sine method if needed. > I believe that it is likely that there have been firmware > updates/improvements over time that would force a partial rewrite of the > newer firmware to accomplish this change to the sine method. Potential ENTS > volumes aren't high enough to cost justify this level of effort. This may > be the reason that such an offer has not be made since. > > Paul > > On Wed, Jan 6, 2010 at 10:17 PM, Don Bertolette <[email protected]>wrote: > > Bob > I have one and would be happy to pay to have it reprogrammed! > Don > > Sent from Don's iPhone 3GS... > > On Jan 5, 2010, at 5:03 PM, Bob <[email protected]> wrote: > > Don, > > I assume they could be reprogrammed. I'd purchase an OPTILOGIC with a > sine based height routine. > > Bob > > > Sent from my iPhone > > On Jan 5, 2010, at 8:55 PM, DON BERTOLETTE < <[email protected]> > [email protected]> wrote: > > Bob- > It seems like they could be re-programmed...isn't OPTI-LOGIC's owner a > forum member? I'd sure like to have my OPTI-LOGIC 800H reprogrammed! > -Don > > ------------------------------ > Date: Tue, 5 Jan 2010 14:41:09 +0000 > From: <[email protected]> <[email protected]>[email protected] > To: <[email protected]> <[email protected]> > [email protected] > Subject: [ENTS] OPTILOGIC > > ENTS > > I looked at the specifications of OPTILOGIC hypsometers in models 100LH, > 400LH, 800LH, 1000LH. The height routine described in the directions is the > 3 measurement, tangent-based routine. That won't work for ENTS for the > reasons that we frequently discuss on the list. Too bad. However, their > hypsometers do return vertical angle. So, it could be used with target > distance like a clinometer-rangefinder combination, but that requires the > operator to do the math. Maybe there is another OPTILOGIC instrument that > uses the sine-based procedure. > > I found the user manual PDF file to be very good. > > Bob > > ----- Original Message ----- > From: "MyCamel" < <[email protected]>[email protected]> > To: "ENTSTrees" < <[email protected]>[email protected]> > Sent: Sunday, January 3, 2010 10:55:41 PM GMT -05:00 US/Canada Eastern > Subject: [ENTS] Re: Suunto vs. iPhone > > Opti-Logic manufactures several Hypsometers > <http://www.opti-logic.com/lh_series.htm><http://www.opti-logic.com/lh_series.htm> > http://www.opti-logic.com/lh_series.htm > > they have 2 and 3 point height measurements. > > On Jan 3, 2:35 pm, Carolyn Summers <[email protected]> wrote: > > 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]>[email protected]> > > > Date: Tue, 22 Dec 2009 15:57:09 -0800 (PST) > > > To: ENTSTrees < <[email protected]>[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 = 38², 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 difference > > > 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. Obviously > > > this can not be same one that is used in the Suunto¹s, looking through > > > 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]><[email protected]> > [email protected] > > > Visit this group athttp://groups.google.com/group/entstrees?hl=en > > > To unsubscribe send email to <[email protected]> > [email protected] Hide quoted text - > > > > - Show quoted text - > > -- > Eastern Native Tree Society <http://www.nativetreesociety.org/> > http://www.nativetreesociety.org > Send email to <[email protected]>[email protected] > Visit this group at <http://groups.google.com/group/entstrees?hl=en> > http://groups.google.com/group/entstrees?hl=en > To unsubscribe send email to > <[email protected]><[email protected]> > [email protected] > > -- > Eastern Native Tree Society > <http://www.nativetreesociety.org/><http://www.nativetreesociety.org/> > http://www.nativetreesociety.org > Send email to <[email protected]>[email protected] > Visit this group at > <http://groups.google.com/group/entstrees?hl=en><http://groups.google.com/group/entstrees?hl=en> > http://groups.google.com/group/entstrees?hl=en > To unsubscribe send email to > <[email protected]><[email protected]> > [email protected] > > ------------------------------ > Hotmail: Trusted email with powerful SPAM protection. Sign up > now.<http://clk.atdmt.com/GBL/go/177141665/direct/01/> > > -- > Eastern Native Tree Society <http://www.nativetreesociety.org/> > http://www.nativetreesociety.org > Send email to <[email protected]>[email protected] > Visit this group at <http://groups.google.com/group/entstrees?hl=en> > http://groups.google.com/group/entstrees?hl=en > To unsubscribe send email to > <[email protected]><[email protected]> > [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]> > [email protected] > > > > ------------------------------ > Your E-mail and More On-the-Go. Get Windows Live Hotmail Free. Sign up > now. <http://clk.atdmt.com/GBL/go/196390709/direct/01/> >
