Global datasets: Difference between revisions

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(→‎GSHHS World Coastline: correct license)
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=== GSHHS World Coastline ===
=== GSHHS World Coastline ===


GSHHS is a high resolution shoreline dataset. It is in the public domain. The shorelines are constructed entirely from hierarchically arranged closed polygons. It is closely linked to the [[GMT]] project.
GSHHS is a high resolution shoreline dataset. It is derived from data in the public domain and licensed as GPL. The shorelines are constructed entirely from hierarchically arranged closed polygons. It is closely linked to the [[GMT]] project.


* Download data from http://www.soest.hawaii.edu/wessel/gshhs/gshhs.html
* Download data from http://www.soest.hawaii.edu/wessel/gshhs/gshhs.html

Revision as of 03:43, 28 October 2008

Raster data

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.

ETOPO

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

ETOPO1

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

ETOPO2v2 data download

GEBCO

  • The General Bathymetric Chart of the Oceans
http://www.gebco.net/data_and_products/gridded_bathymetry_data/

Miscellaneous

  • 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

Since October 1, 2008 all Landsat 7 ETM+ scenes held in the USGS EROS archive are available for download at no charge.

  • Download via the Glovis online search tool (req. Java)
  • Download via the USGS's EarthExplorer interface

Modules

  • r.in.gdal - Main import tool for complete multiband scenes
  • r.in.wms - Download data covering current map region via WMS server
  • r.in.onearth - WMS frontend for NASA's OnEarth Global Landsat Mosaic
  • i.landsat.rgb - Color balancing/enhancement tool

MODIS

Pathfinder AVHRR SST

merge that info here?

QuickBird

SeaWiFS

merge that info here?

Smith and Sandwell

SRTM


Vector data

GSHHS World Coastline

GSHHS is a high resolution shoreline dataset. It is derived from data in the public domain and licensed as GPL. The shorelines are constructed entirely from hierarchically arranged closed polygons. It is closely linked to the GMT project.

how for GRASS 6?
  • Download data from NOAA's shoreline extractor site. Version 1.3 is available for download as shapefiles (but this is some years old, the dataset is now up to version 1.10)
For GRASS 6 you can download 1:250,000 shoreline data from NOAA's site in Mapgen format, which can be imported with the v.in.mapgen module.

VMap0

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