J. Box and B. Vandecrux
by obtaining NASA Airborne Topographic Mapper data nearby GC-Net positions, we estimate the site elevation over time.
linear functions to estimate elevation v time are based on this table
...where on a site by site bases: elevation (meters) = time in decimal years (.e.g. 1996.8972) * 'elev_linear_slope' + 'elev_linear_intercept'
Find figures here and two scripts, first that to find the closest ATM data and that to estimate the elevation over time. Notes inside the scripts provides further info e.g. on obtaining raw ATM data.
This script processes the compilation of coordiantes gathered at the GC-Net sites. Most of the coordinates were obtained with handheld GPSs with varying accuracies. For each site, we then fit use a spline of order one to inter- or extrapolate the station summer position. Consequently, the fit does not necessarily match with the observation for a given year.
Only for the following sites could the yearly position be estimated due to sufficient coordinates and surface velocities above the GPS accuracy level: Swiss Camp Crawford Point 1 DYE-2 EastGRIP Humboldt JAR1 NASA-E NASA-U NASA-SE Petermann ELA Tunu-N
The compilation of coordinates is available here
All the field books are available here
JAR1 has daily position from 2009-05-10 to 2009-10-31:
