Import Topography from ASCII File

Use the IPTOPOFILE GX to import topography information from an ASCII file.

Import Topography from ASCII file dialog options

File Name

The file to import. Script Parameter: IP.TOPOFILE

Additional Notes

The ASCII file must be a CSV (comma-separated values) file with either commas or spaces separating values. It must have three columns of values.

A header line contains the column identification. It must be in one of the following formats:

X,Y,Z

Line,Station,Topo

(The order is not important, and either "Z" or "Topo" can be used for both formats, so the following are valid: X,Y,Topo; Station,Line,Z; Z,Station,Line; etc. )

In the X,Y,Z case, the import is sensitive to the line direction. East-West surveys assume that the line positions are contained in the "Y" column, and the station positions in the "X" column.

The line positions must match exactly the line values found in the database. Station values are then interpolated between the two closest values in the input list of stations for that line (if an exact match is not found).

If either the line is not matched exactly, or the station is out of the range of station values, the topography (Z) value is set to a dummy in the database.