Global datasets/id

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Data raster

Citra Blue Marble

Blue Marble dari NASA adalah sebuah citra visual permukaan bumi yang dipotret dari ruang angkasa dengan ukuran piksel 500 m-8 derajat, tanpa awan.

• lihat halaman wiki Blue Marble

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

Data sources

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

Modules

• 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

See also

• Processing tips can be found on the LANDSAT wiki page

MODIS

• see the MODIS wiki page

Pathfinder AVHRR SST

• see the MODIS#Pathfinder_SST wiki page

merge that info here?

QuickBird

• Wikipedia's QuickBird entry

• 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

Space Shuttle Radar Topography Mission

• see the r.in.srtm module

WorldClim

WorldClim is a set of global climate layers (climate grids) with a spatial resolution of a square kilometer.

• Load into a Lat/Lon WGS84 location (EPSG:4326)
• Import with r.in.bin or r.in.gdal
• r.in.gdal will read .BIL format, see the r.in.srtm shell script for hints
• binary format is 2 byte integer. Multiply by 10 using r.mapcalc to convert units. See http://www.worldclim.org/format.htm for more information and the MODIS help page for example of converting raw to data units.

Vector data

CDC Geographic Boundary and Public Health Maps

• http://www.cdc.gov/epiinfo/maps.htm

Global Administrative Areas

• GADM is a database of the location of the world's administrative areas (boundaries) available in shapefiles.

http://biogeo.berkeley.edu/gadm/

• World Borders Dataset including ISO 3166-1 Country codes available in shapefiles.

http://thematicmapping.org/downloads/world_borders.php

• Free GIS data from Mapping Hacks

http://mappinghacks.com/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.

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

• Import with the v.in.gshhs module for GRASS 5 (perhaps needs to be updated to the latest version of the GSHHS format?)

'for GRASS 6.3+ see the gshhstograss.c program that comes with gshhs_1.10_src.zip. It creates a script to import the data.

• 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.

• Shapefiles for the 1.6 version are available from ftp://ftp.ihg.uni-duisburg.de/GIS/GISData/GSHHS/

SALB

Second Administrative Level Boundaries: "The SALB dataset is a global digital dataset consisting of digital maps and codes that can be downloaded on a country by country basis."

• http://www.who.int/whosis/database/gis/salb/salb_home.htm

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)

Misc

• The FreeGIS.org database: http://www.freegis.org/database/
• http://finder.geocommons.com/