Blue Marble

From GRASS-Wiki
Revision as of 22:02, 29 September 2008 by HamishBowman (talk | contribs) (init. 2002 download links taken from the GpsDrive project (somewhat written by me))

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

The classic Blue_Marble photo of Earth was taken by crew of Apollo 17 on their way to the moon in 1972.

In 2002 NASA released an updated version suitable for GIS created by a mosaic of satellite images with the clouds removed. In 2005 this was rereleased, with a separate image provided for each month of the year.


This page deals with importing the latter into GRASS.

2002

To download the maps you have a few choices:

  • The new maps can be found here:

21600x21600 East Hemisphere (401mb)

[[1]]

21600x21600 West Hemisphere (241mb)

[[2]]

The Wget program is nice for downloading these. For example:

 wget ftp://veftp.gsfc.nasa.gov/bluemarble/land_shallow_topo_east.tif
 wget ftp://veftp.gsfc.nasa.gov/bluemarble/land_shallow_topo_west.tif


  • From the original site (only gzip compressed)

Goto [[3]]

If you are west, download

MOD09A1.W.interpol.cyl.retouched.topo.3x21600x21600.gz

if you are east, download

MOD09A1.E.interpol.cyl.retouched.topo.3x21600x21600.gz

If you are in England or West Europe, you will need both files, because they have to overlap.


  • Download them via ED2k Link (bzip2 compressed):
ed2k://|file|top_nasamap_east.raw.bz2|379972653|7312437945bd47ccf0b2a0c3452d5836|/
ed2k://|file|top_nasamap_west.raw.bz2|226307352|13ab6e8a6e014fa23bb83db25855bb71|/

This files have a uncompressed size of 1.4GB each and are in raw RGB format. The bzip2 compressed files are 363MB (east) and 216MB (west) in size.


  • Check if the files are available from geotorrent.org
[[4]]


2005 monthly