Columbia River Wildlife Mitigation Habitat Evaluation Procedures Report / Scotch Creek Wildlife Area, Berg Brothers, and Douglas County Pygmy Rabbit Projects. Page: 104 of 115
117 pagesView a full description of this report.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
PANAMA
BASAL AREA
ANGLE GAUGE
The PANAMA Basal Area Angle Gauge is a modification of the 33" long gauge described in Article by Mr. L
R. Grosenbaugh. Journal of Forestry Vol. 50. iNo. 1. Jan. 1952. In reducing the length we have tried to mak
it more convenient to carry - - - and use.
In the PANAMA Angle gauge the cruiser looks thru the tube instead of over the top In reducing the overal
length of the gauge we have maintained the plot radius factor or angle of 104.18 minutes. In the forward enc
of the tube we have the two upright lines for paralleling the sides of the tree. We hve opened the parallel line
near the op so that the cruiser can more quickly come to a decision oa borderline trees. We have also adder
8 slight arch in the enact top canter for "centering" the tree. The widening of the Jot at the top for admiztin
light oa either side and the arch at the top will greatly help in overcoming the objection to a shorter gauge.S
rE TWPK (9% inches lng)
Plotless timber cruising. Shaded areas represent
104.10 minute angles optically established by the instrument
described above. Circles represent crosseections (at breast
height) of trees viewed from the sampling point. Cruiser
merely stands at the sampling point (analagous to a plot
center). counts every tree whose d.b.h. appears larger than the
angle or aperture, and disregards every tree whose d.b.h. ap-
pears smaller. All visible from the sampling point must be
counted or rejected. The count of trees, multiplied by 10
gives a m estimate of basal area per acre. In the diagram.
only two trees are counted. so the basal area estimate is 20
square feet per acre. Reliable estimates require more than
one sample. of course.
Basal Area EseT
VI
- raga-*
.ssso EW --Assured of an instrument. the cruiser should decide oa the .-W
pattern of sampling points (analagous to plot centers) that he
wishes to employ on the area to he cruised. He must then
visit each sampling point (or at least an unbiased point in its T'XT
vicinity):. look in every direction through his instrument. and
count the number of trees whose d.b.h. a appear larger than
the crosspiece or aperture. The principle is illustrated in figure 1. The eyepiece (or verte) of the angle-gauge
should pivot on the sampling point until the count is completed. except that it may be temporarily mom
sideways perpendicular to the line of right to clear nearby brush or trees likely to mask other qualifying trees
After a little practice. the cruiser will find he can gauge all but borderline trees by eye alone.
Suppose that the cruiser has tallied a total of 240 qualifying trees at 30 unbiased sampling points oa the area
Estimated basal area ( Number of tallied trees I ( O) 2 80 sq..
per acre _ 1 Number of sampling points) \ 30 8 . ft.Fixed Type, Weight 2 oz.
Panama Pump Company.
P. O. Box 15626
HATITESBURG, MLSSISSIPPI, U. S. A
39404-5626Phone Area Code 601-544-42_
~.AI1iV.L~..flC VT tta~Lbsr~jLv~b, A.'. I>.
O
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Ashley, Paul R. Columbia River Wildlife Mitigation Habitat Evaluation Procedures Report / Scotch Creek Wildlife Area, Berg Brothers, and Douglas County Pygmy Rabbit Projects., report, January 1, 1997; Olympia, Washington. (https://digital.library.unt.edu/ark:/67531/metadc703292/m1/104/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.