Appendix C
Elevation Studies & 3-D Dipstick Topo Maps
C-4
This is a sample of a “ladder” type
of Box arrangement.
The first box goes all the way around
the perimeter, and the secondary boxes
fill the inside like ladder rungs.
Arrows show the direction of data
Collection – black for the outer box and
Blue for the interior boxes.
The interior boxes do not need to overlap
each other, but the narrow ends of the
interior boxes should overlap the outer box as shown.
This is the box layout pattern
that we use most often.
Decide whether you will use the "Rake/Comb" method, or the "Box" method before laying out the measurement lines.
We prefer the "box" method for complex elevation studies and 3-D graphs, and the "comb" method for more simple
requirements.
6.
Designating Run Names
Designate the runs with names that you can remember, that will mean something to you later. There is nothing worse
than labeling all runs numerically from 1 to whatever, with no correlation to the run location on the surface.
Name the area covered by each comb and use the same name for the comb. You might have a comb in bay 18, so call
the base line 18B. (B for "base") You could number the teeth from N to S, so you have runs labeled 18B, 18-1, 18-2,
18-3, etc. If some of the combs are aligned N-S and some are E-W, designate the base line 18BNS, or 18BEW. You
don't have to carry the NS or EW designations on to the teeth, because you know they are perpendicular to the base line.
The important thing is to give each line a meaningful name that will help you remember where it was taken from. If you
use boxes, name each box in a way you'll be able to remember later. Each box will be broken into its 4 constituent lines
later. The Dipstick
software will automatically name each of these 4 lines with the name of the box and a suffix.
7.
Collecting Data
a. Combs
Start the Dipstick
with the rear foot on the paint mark and collect data along the base line. Using a keel or chalk, mark
a circle around the foot when you get to any point from which you want to run a "tooth" later. Do not move the
Dipstick
off the base line or turn it off; simply draw a circle where you want to start a "tooth". Mark the step number
on the surface next to the circle. You will come back to this location later to start your "tooth" runs. When you get to
the end of the base line, collect the last reading, then rotate the Dipstick
in a complete circle, setting it back where it
was so it can collect another reading. Now continue back along the base line until you get back to the start point. (The
details of how to do this are covered in the Hardware Manual under "Bias Run".) Assign a start point elevation of 0
(zero) to the Base Line.
Now collect all the "tooth" runs, starting at the locations where you circled the foot.
b. Boxes
Start the Dipstick
with the rear foot on the paint mark at one corner of the end box, and collect data along a line. For
example, if your lines run from West to East as shown in the example above, start at the lower left (Southwest) corner of
the Western box, and measure along the South (right) line, going from West to East. (Whichever way you do it is OK,
but always start at the outside corner of the outside box, collecting data in the same direction, i.e., going East.)
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