Thanks. I'm refining Webinar #3 as I write this. It will be the most mathematically intense of the webinars. That is not necessarily good. So, clarity is critical.
I plan to cover three ways to do the stick method (similar triangles), an in-depth look at the tangent method and its pitfalls, the sine method, the combination of sine and tangent, two versions of the External baseline method, and methods for estimating the impact of a combination of distance and angle errors on both sine and tangent calculations.
So far the reception to the webinars has been very positive. Hopefully, the third won't go astray. The challenge is to decode the mathematics without losing the insights that come from understanding the underlying mathematica models. Getting good at height is not just a matter of religiously following measuring protocols, but understanding the mathematical assumptions behind a technique or use of an instrument such as a hypsometer.
Matt, if you get a chance to try out that Excel workbook I posted a coupe days ago on the External Baseline Method for Crown Spread, I'd greatly appreciate it. If NTS is going to serve as a source of highly skilled measurers for American Forests, we have to go through the pain of having everyone up to speed on the methods that will be in the user handbook. Don and I will offer a number of Excel workbooks to automate the more complex measuring processes. I can't think of a better group to test them than members of NTS.
Robert T. Leverett
Co-founder and Executive Director
Native Native Tree Society
Co-founder and President
Friends of Mohawk Trail State Forest
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- Matt Markworth