FEMA US&R Response Sys/U.S. Army Corps of Engineers
STRUCTURES SPECIALIST SKILLS TRAINING
October 2007
TST – Total Station Training
Location Measurement In US&R
Y (N)
Z
BS
MP (x,y,z)
CP (x,y,z)
X (E)
IP (x,y,z)
MP
= Monitoring Point
IP
= Instrument Point
CP
= Control Point
Current thinking for US&R is to set the X axis parallel to the side of the building
facing the instrument and the Y axis perpendicular to the building. To do this, a
location on the structure is used to set the azimuth angle to 0
o
(the instrument
refers to the point used to set the azimuth as the back sight,
BS
). The location
must be chosen such that the 0
o
azimuth is perpendicular to the side of the
building facing the instrument.
If creating a new coordinate grid, give the new station widely different
coordinates such as: X = 1000.00 Y = 3000.00 Z = 5000.00 Significantly
different coordinates are beneficial in the event that E, N, Z is mixed up with N,
E, Z. This difference helps the StS quickly translate a change in coordinates to
a magnitude and direction of movement.
Once established on a station, set several Control Points (
CP
):
1. They can be used as alternate instrument stations.
2. This allows options if some sites are blocked by equipment or if you need
to set up the instrument at a new remote location.
3. This allows choices if reestablishing the grid from a new location not
previously located by survey.
Measurement Basics and Theodolite Use Page 5