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CoGo
CoGo
CoGo
Most CoGo (Coordinate Geometry) functions in J-Field are
rather self-explanatory after viewing their diagrams.
CoGo
Direct
,
Inverse
,
Shift
and
Rotate
are found in the
Basic
group
of CoGo functions that will be explained here.
CoGo Basic
Functions
In all CoGo function diagrams, labels shown in black are
inputs and labels shown in red are the resultant calculations.
Input points are displayed in green and red points are
resultant points created from the function.
Direct
CoGo Direct
Direct calculates the coordinate of a new point (
P
2
) given
the coordinate of a known point (
P
1
), bearing (
B
) and
distance (
D
) from
P
1
.
Notice the vertical line in the white box shown between
H,Abs
and the input “0.0 ft”:
Clicking on the left side of this white box with
H, Abs
will
toggle it to the other options of
H, Slope
and
ΔH
Clicking on the right side of this box will allow for the entry
of the value. This functionally is similar in all CoGo menus
when you see a white box separated with a vertical line in
the middle.
The resultant point is shown in the orange box. Clicking on
this box will allow you to edit the Name, Description and
Code of this point.
Once all the inputs have been entered you may tap the
diagram to preview the results in the map. If satisfied, tap
Create to create the resultant points.
Preview Screen of
Cogo Direct
The
CoGo Direct
function can be used to calculate and store
an offset point by using the internal compass and camera to
determine the offset bearing. To determine the bearing to
an object using the compass tap the
button in
the bearing entry screen. Align the cross-hair at the desired
object and press the check hardware button to capture the
azimuth and then tap
Apply
. Determine the offset distance
to the desired object with a tape measure or laser distance
meter.
It is important to check and confirm the compass
calibration is working properly before using this feature;
recalibrate the compass when necessary. Occasionally, the
camera screen may go blank or cause a crash of the system
when using this feature or other features of J-Field that
use the camera. This is a known problem with the current
camera driver. If this happens, reboot the unit. Hold the
On/Off button down to power off the system if becomes
unresponsive.
The accuracy of this offset method is limited
by the accuracy of the compass (typ/- 2 degrees). To
determine a much more accurate position from offsets, use
the
CoGo Resection
function.
Set By Compass
Screen - Determining the Position of a Tree
