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Table of newly added columns.
| Column name | Description |
|---|---|
| letter_group | First level of LUCAS LC1/2 classification |
| year | Year of the survey |
| file_path_gisco_n/s/e/w/p | Path to cardinal or point photo on GISCO |
| th_geom | Geometry of theoretical LUCAS point according to grid |
| gps_geom | Geomtery at the point the surveyor reached |
| th_gps_dist | Calculated distance between the two points |
| visit | Numbers of years of visit for the LUCAS point |
