Topcon GPT-2000 Manuel D’Utilisation

7-10

   7 DATA COLLECTION

This mode is useful when it is difficult to set up the prism directly, for example at the center of a tree. 
Data Collect . Offset Measurement has two measuring methods.

●

Angle offset measurement

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Distance offset measurement

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Plane offset measurement

●

Column offset measurement

Place the prism at the same horizontal distance from the instrument as that of point A0 to measure.

When measuring coordinates of ground point A1  :Set the 
instrument height / prism height.

When measuring  coordinates  of point A0 : Set the 
instrument height only. (Set the prism height to 0 ).

Press the [F3](MEAS) key and press the [F4]key to 
get to the next soft key page.

[F3]
[F4]

Press the [F1](OFSET) key.

[F1]

Press the [F1](ANG.OFFSET) key.

[F1]

Collimate the prism.

Collimate P

Prism P

Prism height

Instrument height

Occ.Point

When sighting to A

0

, you can select one of two 

ways. One is to fix vertical angle to the prism 
position even up down the telescope position, and 
the other is to gear vertical angle to the up down 
of telescope movement. In case following the 
vertical angle to the movement of telescope, SD 
(Slope Distance) and VD (Vertical Distance) will 
be changed according to the movement of 
telescope.
To set this option, refer to Chapter 16 
“SELECTING MODE”.

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