Radiodetection RD1000 Operation Manual page 19

Cross long, linear targets like pipes or cables at a 90 degree
angle to produce a target arch suitable for the soil type calibration.
The depth estimation of a target will be incorrect if the soil type
calibration is done on a target arch produced at an oblique angle
(smaller that 90 degrees).
To determine the Soil Type using a Target Arch:
1. With a target arch visible
on the image, back the
cart up until the Position
Indicator is centered on
the target arch in the GPR
image; preferably one with
long tails because this
provides the most accurate
soil type calibration.
. As you slow down and
stop, the Indicator Arch will
appear on the data image.
Figure .1: indicator arch
Figure .11:
estimating target
depth
Figure .1: position
indicator
RD1000™ Operation Manual 19