last valid timestamp (looking at a subset of key variables: t_u, p_u...)
timestamp of last known coordinates (can be sometimes years prior to the last valid time stamp)
last known latitude, longitude, elevation
Optional:
also look at the first 1-2 week of data and re-estimate the coordinates of AWS at installation, which might evolve as further QC cleans the GPS data. This step could also been done manually after major QC updates.
In that file, we should update:
Optional: