CNES Earth Mean Sea Surface
Geodynamics studies have an interest in the Earth’s Mean Sea Surface (MSS). CNES has provided such a grid post-processed by IGPP (Sandwell_et_al., 2022).
Usage
You access a global MSS grid by specifying the special name
@earth_mss[_rru[_reg]]
The following codes for rru and the optional reg are supported (dimensions are listed for pixel-registered grids; gridline-registered grids increment dimensions by one):
Code |
Dimensions |
Reg |
Size |
Description |
|---|---|---|---|---|
01d |
360 x 180 |
g,p |
82 KB |
1 arc degree global MSS (MSS @ 315 km) |
30m |
720 x 360 |
g,p |
245 KB |
30 arc minute global MSS (MSS @ 157 km) |
20m |
1080 x 540 |
g,p |
500 KB |
20 arc minute global MSS (MSS @ 105 km) |
15m |
1440 x 720 |
g,p |
840 KB |
15 arc minute global MSS (MSS @ 79 km) |
10m |
2160 x 1080 |
g,p |
1.7 MB |
10 arc minute global MSS (MSS @ 52 km) |
06m |
3600 x 1800 |
g,p |
4.3 MB |
6 arc minute global MSS (MSS @ 32 km) |
05m* |
4320 x 2160 |
g,p |
5.7 MB |
5 arc minute global MSS (MSS @ 26 km) |
04m* |
5400 x 2700 |
g,p |
8.5 MB |
4 arc minute global MSS (MSS @ 21 km) |
03m* |
7200 x 3600 |
g,p |
15 MB |
3 arc minute global MSS (MSS @ 16 km) |
02m* |
10800 x 5400 |
g,p |
26 MB |
2 arc minute global MSS (MSS @ 11 km) |
01m* |
21600 x 10800 |
g |
79 MB |
1 arc minute global MSS (original) |
See GMT remote dataset usage for when resolution codes are optional or required.
All of these data will, when downloaded, be placed in your ~/.gmt/server directory, with
the earth_mss files being placed in an earth/earth_mss sub-directory. If you do not
specify a CPT, the default CPT for this dataset (the GMT master @earth_mss CPT) will be used.
Technical Information
We scale and reformat the original data to take up very little space so that downloads from the servers are as fast as possible. For the MSS grid this means we chose 0.01 m as the smallest data unit, which is well below the uncertainties in the model. Data are scaled and shifted to fit in a short integer grid that is highly compressed by netCDF lossless compression and chunking. The data are reported in meters.