Edit Values for Correction Codes¶

Use this dialog to set up which corrections should be applied to different observation types for a specific correction code.

Where to find the dialog?¶

Select the Gemini Terrain Settings... icon, then choose Land Surveying: Correction Codes under General Settings.

Code¶

Unique designation for the type of correction. The code number is used by calculation functions and stored with the observations.

Description¶

A short, verbal description of the content of the correction code.

Corrections¶

Warning

Be aware that some corrections depend on the coordinate system.

Instr.¶

Applies to the instrument's calibration values, such as addition constant and scale factor. The values are defined under instrument parameters.

Pressure/Temp.¶

Correction of measured distance for pressure and temperature. This requires that pressure and temperature are specified for the station, and that calibration values are specified for the instrument.

Refr.¶

Refraction. This is most significant for the zenith distance, but also affects long distances. The refraction coefficient is defined below.

Elevation¶

Elevation above sea level. Reduces the distance from mean elevation to the ellipsoid (to the geoid if geoid height is unknown). If geoid height is specified in the coordinate list, it is used. Otherwise, the average geoid height given under Calculate - Options in the current project is used.

Earth Curvature¶

Correction due to earth curvature. Most significant for the zenith distance, but also affects long distances.

Map Projection¶

Correction for map projection. This includes both correction for the mathematical projection, usually Gauss-Krüger in Norway, and any scale factors for the coordinate system (-400 ppm in UTM).

Plumb Deviation¶

This is a small correction of directions due to plumb deviation at the setup point. It is most significant for steep sights. Known plumb deviations are entered in the coordinate list.

Refraction Coefficient¶

You have two options for which refraction coefficient a correction code should use:

Use the value defined under calculation options for the application layer.
Enter a value that only applies to this specific correction code.