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http://sos.noaa.gov/datasets/Land/etopo2.html ETOPO2 Global 2-Minute Gridded Elevation Data Data: Land Elevations and Ocean Bathymetry Raw 2-minute grids in: 1. big-endian (ETOPO2.raw.bin) & 2. little-endian (ETOPO2.dos.bin) formats (16-bit signed integers, 10800 columns x 5400 rows) For full information about ETOPO2, including searching, extraction, display capabilities, please see http://www.ngdc.noaa.gov/mgg/fliers/01mgg04.html The full GEODAS custom grid functionality is now online: You can now produce and download custom grids from ETOPO2 on-line for free: http://www.ngdc.noaa.gov/mgg/gdas/gd_designagrid.html warning: you do not need to download the full database, just run designagrid on-line. Frequently Asked Questions: * What are the datums (horizontal and vertical references) for ETOPO2? The horizontal datum is WGS-84, the vertical datum is Mean Sea Level. * How does one cite ETOPO2? U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Geophysical Data Center, 2001. 2-minute Gridded Global Relief Data (ETOPO2) http://www.ngdc.noaa.gov/mgg/fliers/01mgg04.html * What is the resolution of ETOPO2? The horizontal resolution is 2-minutes of latitude and longitude (1.853 km at the Equator). The vertical resolution is 1 meter. * What is the projection of ETOPO2? ETOPO2 is in the Cylindrical Equidistant Projection (sometimes called Latitude-Longitude, or Geographic) * What do the grid data actually represent? The grid values represent the elevation at the grid intersections at even multiples of 2 minutes of latitude and longitude, averaged over the cell's area. * Is the sea floor really that bumpy, and what are the long, straight lines on the ocean floor that converge on places like San Diego and Bermuda? The "orange-peel" look of the sea floor is mostly an artifact of the satellite altimetry technology and its interpretation of ocean surface waves. The straight lines are where direct shipborne measurements have been included in the data as "ground truth". These measurements help calibrate, but do not correspond 100 percent to the radar altimetry. See W.H.F. Smith and D.T. Sandwell, 1997, Global Sea Floor Topography from Satellite Altimetry and Ship Depth Soundings, Science 277 (5334), p.1956-1962. * What about shallow (<200m) water? The satellite altimetry works best in deep water and can distinguish many undersea features that are not otherwise surveyed directly. In shallow water, the gravitational effects that can be measured from the satellite are too small to be reliable. In US waters and some other areas, local high-resolution survey data have been used where available. * How do I run ETOPO2? ETOPO2 is a database, not a program. You will need imaging or analysis software to use the data. Technical contact: Dr. Peter W. Sloss (303) 497-6119 peter.w.sloss@noaa.gov revised Wed Jul 13 2005 13:05:23 GMT-0600 (Mountain Daylight Time) W3C
Product Type
nonGeographicDataset
eCat Id
66961
Contact for the resource
Custodian
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- Topographic Map
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- AU-WA
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Topology
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- Published_Internal
Publication Date
2008-07-09T00:00:00
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unknown
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imageryBaseMapsEarthCover
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Full lineage details can be obtained from custodian: NIMA
Parent Information
Extents
[-89.91657, -89.89242, 179.97201, -179.99616]
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