LaserAce® Pocket Series
Issue 1.0
© Copyright 1999-2008 Measurement Devices Limited
Page
51
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10.3
Length/Lean/Volume
As the name suggests this function allows measurement of tree length, lean and volume. The unit prompts for
the Tapering factor to be entered first. The tapering factor, which depends on the species of tree to be
measured, should be entered as a percentage. That is, a tapering factor of 10% implies that the tree diameter
varies by 10cm for every 100cm in length.
When the tapering factor is zero, the tree is considered to be in a cylindrical shape, with the tree diameter being
taken from the middle shot. If the tapering factor is anything other than zero, then it is used to calculate the
diameter of the top and bottom of the tree. The tree volume is calculated as volume of the frustrum with the top
diameter being less than the diameter at the base of the tree.
Once the tapering factor is entered, the Length/Lean/Volume menu is displayed, this has 6 sections: The first
three are
SINGLE POINT, TWO POINT
and
THREE POINT,
which are the modes to measure and calculate tree
length, lean and volume. The next two options are
DOWNLOAD
and
PRINT TREE TABLE
, for retrieving,
printing and viewing the measurements saved in the unit’s memory. The last option
CLEAR MEMORY
, deletes
the whole memory.
Once the measured values have been calculated using any of the three methods, the calculated and measured
data is sent out via Bluetooth® (refer to section 11.2).
10.3.1
Single Point
In the
SINGLE POINT
mode, the user is asked to
SET DIAMETER SCOPE
first. The stadia selection can be a
stadia pair (eg 0 and 3) or it can be set to
NIL
. If stadia are set to NIL, only the log height and horizontal distance
from the laser is measured. Pressing the
■
key after a shot accumulates the results.
If the stadia scope is set to one of the stadia pairs, the user is asked to enter a plot number first, and then a tree
number. The LaserAce® Pocket Series then searches the memory to see if this plot/tree number has already
been entered, if the entry already exists then the user is asked if they wish to keep the stored entry or delete it.
The screen then displays:
SINGLE POINT
LOG DIAMETER
- - . - - m.
LOG HEIGHT
- - . - - m.
LOG VOLUME
- - . - - m
3
STADIA 0 & 2
The user should then sight the tree at the required diameter point on the trunk ensuring that the stadia hairs
chosen “bracket” the tree and press Fire to take the reading. The Hypsometer then calculates the log diameter,
height and volume.
If tapering factor is set to zero, then the volume of the log is calculated as the volume of a cylinder. If the
tapering factor is non-zero then this is used to calculate the base diameter and the volume is calculated as the
volume of the frustrum. The
■
key accumulates log volume and log height (or only the log height if the stadia
scope is set to NIL).
NOTE
: No volume calculation is done if the stadia scope is set to NIL.
