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)
Note that resolutions 05m and higher are tiled. See Remote Data Sets for more information.
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.