NASA Mars Relief
Usage
You access the global MOLA relief grid by specifying the special name
@mars_relief[_rru[_reg]]
This grid contains observed relief measured via altimetry. The following codes for the optional rru and 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 |
109 KB |
1 arc degree Mars relief (MOLA @ 168 km) |
30m |
720 x 360 |
g,p |
373 KB |
30 arc minute Mars relief (MOLA @ 84 km) |
20m |
1080 x 540 |
g,p |
781 KB |
20 arc minute Mars relief (MOLA @ 56 km) |
15m |
1440 x 720 |
g,p |
1.3 MB |
15 arc minute Mars relief (MOLA @ 42 km) |
10m |
2160 x 1080 |
g,p |
2.8 MB |
10 arc minute Mars relief (MOLA @ 28 km) |
06m |
3600 x 1800 |
g,p |
7.5 MB |
6 arc minute Mars relief (MOLA @ 17 km) |
05m* |
4320 x 2160 |
g,p |
11 MB |
5 arc minute Mars relief (MOLA @ 16 km) |
04m* |
5400 x 2700 |
g,p |
16 MB |
4 arc minute Mars relief (MOLA @ 11 km) |
03m* |
7200 x 3600 |
g,p |
28 MB |
3 arc minute Mars relief (MOLA @ 8.4 km) |
02m* |
10800 x 5400 |
g,p |
61 MB |
2 arc minute Mars relief (MOLA @ 5.6 km) |
01m* |
21600 x 10800 |
g,p |
228 MB |
1 arc minute Mars relief (MOLA @ 2.8 km) |
30s* |
43200 x 21600 |
g,p |
822 MB |
30 arc second Mars relief (MOLA @ 1.4 km) |
15s* |
86400 x 43200 |
g,p |
2.7 GB |
15 arc second Mars relief (MOLA @ 0.7 km) |
12s* |
106694 x 53347 |
p |
3.1 GB |
12.14… arc second Mars relief (MOLA 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 mars_relief files being placed in an mars/mars_relief sub-directory. If you
do not specify a CPT then the default CPT for this dataset (the GMT master @mars_relief CPT) will be used.
Technical Information
As you see, the 01m and lower resolutions are all derivatives of USGS’ 12.1468873601 arc-second Mars_HRSC_MOLA_BlendDEM_Global_200mp_v2.tif (Neumann_et_al., 2003). We have downsampled it via Cartesian Gaussian filtering to prevent aliasing while preserving the latitude-dependent resolution in the original 12.1468873601 arc sec grid. The full (6 sigma) filter-widths are indicated in parenthesis. Almost all grids are available in both gridline- and pixel-registered formats except the original pixel-registered grid at 12.1468873601 arc-seconds resolution (here called @mars_relief_12s). Data resolution is 0.5 meter.
Data References
MOLA: [https://doi.org/10.1029/2000JE001426].