Topcon GPT-2005 User Manual

5-3

   5 COORDINATE MEASUREMENT

Measure the coordinates by entering the instrument height and prism height, coordinates of unknown 
point will be measured directly.

●

When setting coordinate values of occupied point, see Section 5.1 “Setting Coordinate Values of 
Occupied Point”

●

When setting the instrument height and prism height, see Section 5.2 “Setting Height of the 
Instrument” and 5.3 “Setting Height of Target (Prism Height)”.

●

The coordinates of the unknown point are calculated as shown below and displayed:

Coordinates of occupied point

: (N

0

, E

0

,Z

0

)

Instrument height

: INS.HT

Prism height

: R.HT

Vertical distance (Relative elevation)

: z (VD)

Coordinates of the center of the prism,
originated from the center point of the instrument

: (n,e,z)

Coordinates of unknown point : (N

1

,E

1

,Z

1

)

N

1

=N

0

+n

E

1

=E

0

+e

Z

1

=Z

0

+INS.HT+z - R.HT

Set the direction angle of known point A. *1)

Collimate target prism.

Set direction

angle

Collimate P 

Press the [

] key.

Measuring starts.

The result will be shown.

[

]

*1) Refer to Section 3.3 “Measuring from the Required Horizontal Angle”.

●

In case the coordinate of instrument point is not entered, (0,0,0) will be used as the default for the 
instrument point.
The instrument height will be calculated as 0 when the instrument height is not entered.

●

The prism height will be calculated as 0 when the prism height is not set.

Origin (o, o, o)

Occupied point (No, Eo, Zo)

Center point of the instrument
(No, Eo, Zo+INS.HT)

Coordinates of the center of the prism, originated from the 
center point of the instrument (n, e, z)

Unknown point

(N

1

, E

1

, Z

1

)

  

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