The Barrax measurement files (<sensor>_<surface>_avgs.txt) contain 21 columns and 4 or 13 rows (Proba-V or S2 respectively). The first column gives the instrument band number/name; the next 10 columns give the processed reflectance (Hemispherical Directional Reflectance Factors) values for each sample location (1…10); the 10 columns after that contain the uncertainty associated with the reflectance values at each sample location (again 1…10 and at k=1). Each row gives a different instrument band. For Sentinel-2, bands 10, 11, and 12 are given as nan (not a number) values because the panel calibration (and source of traceability) did not reach these wavelengths. This is also true for the Proba-V’s shortwave infrared (SWIR) band. The Proba-V instrument has three cameras with slightly different spectral response functions. As a result, there is a measurement file associated with each of these cameras. 

The files beginning or <sensor>_<surface>_loc_avg.txt are the average HDRF values for the whole 200 m x 200 m. Here there are only 3 columns: 1) band no/name, 2) HDRF, and 3) u(HDRF). 

The GPS file (Waypoints_02-AUG-18.txt) gives the position of each sample point. 