Topcon GPT-3000W Series - Layout Preparation

8-3
8 LAYOUT
8.1 Preparation
8.1.1 Setting the GRID FACTOR
● Calculation Formula
1) Elevation Factor
2) Scale Factor
Scale Factor : Scale Factor at the surveying station
3) Grid Factor
Grid Factor = Elevation Factor
×
Scale Factor
Distance Calculation
1) Grid Distance
2) Ground Distance
● How to Set Grid Factor
Operating procedure Operation Display
1
Press the [F3](GRID FACTOR) key from the
Layout menu 2/2.
[F3]
2
Press the [F3](YES) key.
3
Press the [F1] (INPUT) key and enter Elevation.
*1) Press the [F4](ENT) key.
[F3]
[F1]
Enter ELEV.
[F4]
4
Enter Scale Factor in the same way.
Grid Factor is displayed for 1 to 2 second and
display returns to Layout menu 2/2.
[F1]
Enter Scale
[F4]
*1) Refer to Section 2.6 “How to Enter Alphanumeric characters”.
● Input Range :Elevation : –9,999 to +9,999 meter (–32,805 to +3,2805 ft, ft+in)
Scale Factor : 0.990000 to 1.010000
● See section 8.1.1 “Setting the GRID FACTOR” for more information.
R R
: The average radius of the earth
R+ELEV. ELEV.
: The elevation above mean sea level
Elevation Factor =
HDg = HD
HDg : Grid distance
HD : Ground distance
×
Grid Factor
HDg
Grid Factor
HD =
LAYOUT 2/2
F1:SELECT A FILE
F2:NEW POINT
F3:GRID FACTOR P
↓
GRID FACTOR
=0.998843
>MODIFY? [YES][NO]
GRID FACTOR
ELEV.
→
1000 m
SCALE:0.999000
INPUT ––– ––– ENTER
1234 5678 90.–[ENT]
GRID FACTOR
ELEV.:2000 m
SCALE
→
1.001000
INPUT ––– ––– ENTER
GRID FACTOR
=1.000686