| Summary: | Progress Code: completed Statement: # GPS surface elevation profiles for the Amery Ice Shelf for various campaigns # 1995, 1999, 2000, 2003, 2005/6 # # The raw GPS data were collected under Australian Antarctic Science Advisory Committee (ASAC) funding # to PI Richard Coleman. # The data processing was as described in the paper below. Briefly, these are # 1995: in Leica Ski software, relative to on ice base station, with # coordinates determined relative to rock site at Beaver Lake # subsequent: in Track (GAMIT/GLOBK) relative to base station with coordinates # determined using GIPSY precise point positioning # Coordinate files are in a format to allow easy crossover computations using the GMT supplementary routine # x2sys_crossover using the geoz.def definition provided # e.g., for GPS/GPS crossovers it would be # x2sys_cross file1 file2 -TGEOZ -A0.2 -Ndk -Qe -Ia -V -2 -Ce -Wn6 # col1: time in days since 00:00 Jan 1, 2000. non-integer part of the day may just be a count by epoch rather than actual time. # col2: lon (WGS84 deg) # col3: lat (WGS84 deg) # col4: height (WGS84 ellipsoidal elevation, after removal of ocean tides, ocean tide loading displacement, inverse barometer effect and permanent body tide). See note 1. # Note 1: Corrections applied: # 1. tides (TPXO6.2) # 2. tidal loading displacement (TPXO6.2) # 3. inverse barometer effect (IB corrections are relative to mean pressure (981.2hPa) at the Amery G3 AWS in 1999-2003). # 4. permanent body tide was removed for compatibility to ICESat products (note that ICESat Release 428 products, not included here, are not conventionally on WGS84 ellipsoid so this correction may need to be applied to external datasets for compatibility). This was done by block shifting the GPS time series by -0.10 m # Full details are provided in the paper below. # in using these data please cite King, M.A., R. Coleman, A. Freemantle, H.A. Fricker, R.S. Hurd, B. Legresy, L. Padman and R. Warner 2009. A 4-decade record of elevation change of the Amery Ice Shelf, East Antarctica. ...
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