NASA Venus Relief
Usage
You access the global Magellan Venus relief grid by specifying the special name
@venus_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 |
107 KB |
1 arc degree Venus relief (Magellan @ 299 km) |
30m |
720 x 360 |
g,p |
374 KB |
30 arc minute Venus relief (Magellan @ 149 km) |
20m |
1080 x 540 |
g,p |
783 KB |
20 arc minute Venus relief (Magellan @ 100 km) |
15m |
1440 x 720 |
g,p |
1.3 MB |
15 arc minute Venus relief (Magellan @ 75 km) |
10m |
2160 x 1080 |
g,p |
2.8 MB |
10 arc minute Venus relief (Magellan @ 50 km) |
06m |
3600 x 1800 |
g,p |
7.4 MB |
6 arc minute Venus relief (Magellan @ 30 km) |
05m* |
4320 x 2160 |
g,p |
10 MB |
5 arc minute Venus relief (Magellan @ 25 km) |
04m* |
5400 x 2700 |
g,p |
16 MB |
4 arc minute Venus relief (Magellan @ 20 km) |
03m* |
7200 x 3600 |
g,p |
27 MB |
3 arc minute Venus relief (Magellan @ 15 km) |
02m* |
10800 x 5400 |
g,p |
57 MB |
2 arc minute Venus relief (Magellan @ 10 km) |
01m* |
21600 x 10800 |
g,p |
208 MB |
1 arc minute Venus relief (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 venus_relief files being placed in an venus/venus_relief sub-directory. If you
do not specify a CPT then the default CPT for this dataset (the GMT master @venus_relief CPT) will be used.
Technical Information
As you see, the 02m and lower resolutions are all derivatives of USGS’ 1 arc-minute Sandwell_Final_Topo_Venus_2012_meter.grd (Sandwell, 2012). 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 @venus_relief_12s). Data resolution is 0.5 meter.