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Topcon GPT-2005 Manuel D’Utilisation

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   8 LAYOUT
8-3
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]
●
Input Range :Elevation      : –9,999 to +9,999 meter (–32,805 to +3,2805 ft, ft+in)
                     Scale Factor : 0.990000 to 1.010000
       R                R         
: The average radius of the earth
R+ELEV.        ELEV.
  : The elevation above mean sea level
Elevation Factor =
HDg = HD
HDg : Grid d istance
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