CHCNAV CHC CTS-112R4, Руководство пользователя

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CHC CTS-112R4 user manual 67
11. Stakeout
Stakeout mode has two functions that are setting of stake points and setting new points using
coordinate data in the internal memory. The coordinate data for stakeout maybe the points stored in
the internal memory, or maybe inputted from keyboard. The coordinate data is loaded from PC to the
internal memory via communication cable.
11.1. Stakeout procedure
There are the following steps:
1)
Selecting stakeout file. You can call up the occupied point coordinate data, backsight coordinate
data, and stakeout point data.
2) Setting occupied point.
3) Setting backsight point and azimuth angle.
4) Input stakeout point coordinates, and then starts.
11.2. Preparation
11.2.1. Setting the grid factor
Calculation Formula
•
Elevation factor=R/(R+ELEV) R: The average radius of the earth ELEV: The elevation above mean sea
level
•
Scale factor in the surveying station
•
Grid factor = Elevation factor × Scale factor
Distance calculation
•
HDg = HD × Grid factor
HDg: Grid distance
HD: Ground distance
•
Ground distance
HD= HDg/ Grid factor
How to set grid factor?
1) Press [MENU] -> [5] PARAMETERS-> [3] OTHER SET -> [F4] Page2 -> [5] GRID FACTOR.