copyright and disclaimer information

This page serves as a online resource for myself and other foresters and forest engineers.

As much as we like to pride ourselves in our professional ability to prepare for a long distance, long-term project, I am willing to bet that there are other foresters who have found themselves lacking something at the field or the ‘satellite’ office. 

Besides simply forgetting something (which is bound to happen occasionally since there are so many things to remember to bring at times), planning reasonable contingencies sometimes might not be enough. For example, your paint gun tip might be jammed up 6 miles from the truck, yet you forgot to pack or are out of tips - or - you might have just accidentally broken off your external GPS antenna in a URX connector of a sealed unit - or - how about you notice a bubble in your compass that wasn’t there the last time you used it! - These things happen to all of us at times, as much as we try to forecast likelihood of events and prepare accordingly. The only way to prevent error is to prevent the activity in which an error is possible.  Problem is, doing nothing is not an option.

So far I have been unsuccessful in the application of using a virtual resource to supply tangible goods logistically using virtual means.  It maybe possible one day, but so far I am not aware of anyone else’s success at this either, so tools and tips I cannot supply here.  However, below I have included some potentially useful conversions, rules, short-cut calculations and other information that may be difficult to find anywhere else outside of your office library.

If you find this handy, shoot me an e-mail!

Note: you may find the links page helpful to you as well.
 

Linear and area measurements:
(English system; conversion to Metric system)

1 link = 7.92 inches (”) = 0.201168 meters
1 rod = 25 links = 16.5 feet (’) = 5.0292 meters
1 chain = 4 rods = 66’ = 20.1168 meters
1 statute mile = 5280’ = 320 rods = 80 chains = 1.609344 km.
1 acre [~ 208.71 feet2] = 43,560 ft2 = 10 square chains = 160 rods2 = 0.404685642 ha.
1 section = 1 mile2 = 640 acres = 258.9988109 ha.

  (Metric system;  conversion to English system):

1 Millimeter (mm.) = .001 meters = 0.03937 inches
1 Centimeter (cm.)= .01 meters = 0.3937 inches
1 Kilometer (km.) = 1,000 meters = 39.37 inches
1 Square kilometer = 1,000,000 meters2 = 0.386 miles2
1 Hectare (ha) = 10,000 meters2 = 2.47 acres
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Basal Area (BA) and Basal Area/Acre or Basal Area/Hectare conversions; Metric to English and English to Metric. These may come in handy during international consulting or for scientific projects.
 

Measuring tree DBH, in a big woods? - Got trees that exceed your USFS Forester’s Timber management field book?  Extrapolate using logarithmic (natural log) differentiation. I found it was the best match of increasing volumes when I ran into timber trees that were off the charts - and later found the USFS biometrists out of Asheville, NC found the same thing during their research into a new model for assessing volume.  I do not have a link here regarding that publication unfortunately.

Colleagues, some of these numbers are rounded - and not necessarily to significant figures. These are just quick references for your convenience.  If you see an error, have a comment  or have any ideas for further inclusion of information that might come in handy, please feel free to contact me!

Shortcut volume rules for timber cruising:

Total cubic foot volume of stem wood per acre:
0.42(BA/acre) (Avg. total height)

Cordwood volume/acre - preliminary estimate:
Rough cords/acre = (avg. tree tally per point + average bolt tally per point)/2

Sawtimber Volume per acre - preliminary estimate:
(Scribner) MBF/acre = 0.6(Avg. # of sawlogs per point)
 

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