ALT-TGtrends -> Altimetry - tide gauge differenced trends computed using Hector.
ALT-TGpresentdaymass -> Present-day mass redistribution trends for the time span of altimetry - tide gauge series.
GNSStrends -> All GNSS trends within 50 km with uncertainties lower than 1 mm/yr.
GNSSpresentdaymass -> Present-day mass redistribution trends for the time span of GNSS series.
GNSSmedianTrends -> Best approach for combining the GNSS trends (not corrected for present-day mass redistribution).

------------------------------------------------------------------------------------------------------------------

ALT-TGtrends and ALT-TGpresentdaymass name:
The last digits represent the correlation threshold (-1.0,0.0,0.1,...0.7).
The 'W' indicates if correlation weighting is applied (for ALT-TGpresentdaymass this is not really relevant).

GNSStrends and GNSSpresentdaymass name:
PSMSL TG* code

* PSMSL TG = Permanent Service for Mean Sea Level Tide Gauges codes

------------------------------------------------------------------------------------------------------------------

ALT-TGtrends file content:
Longitude TG, latitude TG, trend, trend uncertainty, PSMSL TG code, Start day**, End day**

ALT-TGpresentdaymass file content:
Present-day mass contribution to the ALT-TG trend

GNSStrends file content:
Longitude GNSS***, latitude GNSS***, trend, trend uncertainty, Start date, End date, Number of observations, estimated distance to TG***

GNSSpresentdaymass file content:
Present-day mass contribution to the GNSS VLM trend

GNSSmedianTrends file content:
Longitude TG, Latitude TG, trend, trend uncertainty

** days as specified by the Hector software manual
*** position of the tide gauges often not given very precisely in PSMSL, so the distance to the tide gauge might differ several tens of meters

------------------------------------------------------------------------------------------------------------------

The eight different methods described in the article can easily be applied to the GNSS trends.

