Global datasets

Blue Marble imagery

NASA's Blue Marble is a 500m-8 degree per-cell world wide visual image of the Earth from space, with the clouds removed.

• see the Blue Marble wiki page

ETOPO

The ETOPO datasets provide global topography and bathymetry at 1', 2', and 5' per-cell resolutions.

ETOPO1

• http://www.ngdc.noaa.gov/mgg/global/

The cell registered version can be loaded directly into a lat/lon region. GRASS raster data is cell registered (see the GRASS raster semantics page)

The grid registered version must be loaded into a simple XY location using the parameters found in the .hdr file, and needs to have the 90deg N,S rows cropped away:

# create a new simple XY location and mapset

# Import grid registered binary float
r.in.bin -f in=etopo1_bed_g.flt out=etopo1_bed_g \
   n=90.008333333335 s=-90.008333333335 e=180.00833333334 \
   w=-180.00833333334 rows=10801 cols=21601 anull=-9999
r.colors out=etopo1_bed_g color=etopo2

# reduce region by 1 cell
g.region rast=etopo1_bed_g
eval `g.region -g`
g.region n=n-$nsres s=s+$nsres e=e-$ewres -p

# save smaller raster and remove original
r.mapcalc "etopo1_bed_g.crop = etopo1_bed_g"
g.remove etopo1_bed_g

# change the location to lat/lon by restarting GRASS
#  in the PERMANENT mapset and running g.setproj
#  or move the entire mapset into a lat/lon location
#  and manually edit the $MAPSET/cellhd/ files (dirty!)

ETOPO2

• See the ETOPO2 (2' global) article by M.H. Bowman in the GRASS Newsletter, 1:8-11, August 2004.

ETOPO2v2 data download

GEBCO

• The General Bathymetric Chart of the Oceans

http://www.gebco.net/data_and_products/gridded_bathymetry_data/

Miscellaneous

• Some datasource links: http://www.ruf.rice.edu/~ben/gmt.html

• The r.in.gdal modules may be used to import data of many formats, including GMT netCDF
• The r.in.bin module may be used to import raw binary files

LANDSAT

• r.in.wms
• r.in.onearth
• i.landsat.rgb

MODIS

• see the MODIS wiki page

Pathfinder AVHRR SST

• see the MODIS#Pathfinder_SST wiki page

merge that info here?

QuickBird

• Import with the r.in.gdal module

SeaWiFS

• see the MODIS#SeaWiFS wiki page

merge that info here?

Smith and Sandwell

• Merge info here from the Marine Science wiki page

SRTM

• see the r.in.srtm module

VMap0

1:1 million vector data. Formerly known as Digital Chart of the World

• see the two articles in GRASS Newsletter vol. 3 (June 2005)