Topography data: Difference between revisions
From CSDMS
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! class="" colspan="3" | Data description | ! class="" colspan="3" | Data description | ||
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| class="" colspan="3"| ETOPO5 (Earth Topography 5-minute) is a gridded elevation (land) and bathymetry (sea floor) data set for the entire Earth at a grid spacing of 5 minutes (1/12 of a degree or 300 arcseconds). The entire data set consists of a single file which has 4320 columns and 2160 rows. This data set was compiled using data from many different sources by the National Geophysical Data Center (NGDC), which is part of the National Oceanic and Atmospheric Administration (NOAA). Most of the data set dates to 1988, except for a small area in Canada that was regridded in 1990. Elevation values are stored in a flat binary file (row major, no header) as signed 2-byte integers, and are available with both the LSB (least significant byte first) and MSB (most significant byte first) byte orders. The elevation units are meters.<br>Note - The newer GLOBE and GTOPO30 data sets also provide global coverage at the much higher resolution of 30 arcseconds. | | class="" colspan="3"| ETOPO5 (Earth Topography 5-minute) is a gridded elevation (land) and bathymetry (sea floor) data set for the entire Earth at a grid spacing of 5 minutes (1/12 of a degree or 300 arcseconds). The entire data set consists of a single file which has 4320 columns and 2160 rows. This data set was compiled using data from many different sources by the National Geophysical Data Center (NGDC), which is part of the National Oceanic and Atmospheric Administration (NOAA). Most of the data set dates to 1988, except for a small area in Canada that was regridded in 1990. Elevation values are stored in a flat binary file (row major, no header) as signed 2-byte integers, and are available with both the LSB (least significant byte first) and MSB (most significant byte first) byte orders. The elevation units are meters.<br>Note - The newer GLOBE and GTOPO30 data sets also provide global coverage at the much higher resolution of 30 arcseconds.<br>''This description is provided by Rivix LLC'' | ||
''This description is provided by Rivix LLC'' | |||
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* '''GLOBE''' (Global Land One-km Base Elevation)<br> | * '''GLOBE''' (Global Land One-km Base Elevation)<br> | ||
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! class="" colspan="3" | Data description | ! class="" colspan="3" | Data description | ||
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| class="" colspan="3"| GLOBE is an international effort to create a global digital elevation model (DEM) on a nominal 1-kilometer grid. Data from a variety of sources was compiled and independently peer-reviewed to provide 30 arcsecond grid spacing, which corresponds to approximately one kilometer near the equator. GLOBE Version 1.0 was completed and released in 1999. GLOBE is an activity of the Committee on Earth Observation Satellites (CEOS), and is part of Focus 1 of the International Geosphere-Biosphere Programme's Data and Information System (IGBP-DIS).<br>GLOBE coverage is divided into sixteen tiles. Each tile spans 90 degrees of longitude has 10800 columns. Tiles bordering the equator span 50 degrees of latitude and have 6000 rows, while the remaining tiles span 40 degrees and have 4800 rows. Elevation data is stored as signed 2-byte integers in flat binary (row major) files with the LSB (least significant byte first) byte order and units of meters. Header files for several formats are also available. Bathymetric data is not yet included but is planned for a future version of GLOBE. | | class="" colspan="3"| GLOBE is an international effort to create a global digital elevation model (DEM) on a nominal 1-kilometer grid. Data from a variety of sources was compiled and independently peer-reviewed to provide 30 arcsecond grid spacing, which corresponds to approximately one kilometer near the equator. GLOBE Version 1.0 was completed and released in 1999. GLOBE is an activity of the Committee on Earth Observation Satellites (CEOS), and is part of Focus 1 of the International Geosphere-Biosphere Programme's Data and Information System (IGBP-DIS).<br>GLOBE coverage is divided into sixteen tiles. Each tile spans 90 degrees of longitude has 10800 columns. Tiles bordering the equator span 50 degrees of latitude and have 6000 rows, while the remaining tiles span 40 degrees and have 4800 rows. Elevation data is stored as signed 2-byte integers in flat binary (row major) files with the LSB (least significant byte first) byte order and units of meters. Header files for several formats are also available. Bathymetric data is not yet included but is planned for a future version of GLOBE.<br>''This description is provided by Rivix LLC'' | ||
''This description is provided by Rivix LLC'' | |||
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* '''GTOPO30''' (Global 30 Arc-Second Elevation Data Set)<br> | * '''GTOPO30''' (Global 30 Arc-Second Elevation Data Set)<br> | ||
Data description | {| class="wikitable collapsible collapsed" | ||
! class=""| Data description | |||
! class=""| [http://edc.usgs.gov/products/elevation/gtopo30/gtopo30.html Original data source] | |||
! class=""| [http://edc.usgs.gov/products/elevation/gtopo30/gtopo30.html Download data] | |||
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! class="" colspan="3" | Data description | |||
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| class="" colspan="3"| GTOPO30 is a global digital elevation model (DEM) with a horizontal grid spacing of 30 arcseconds (about 1 kilometer at the equator). GTOPO30 was developed through a collaborative effort led by staff at the USGS EROS Data Center. NASA and several other organizations around the world contributed to the project, which was completed in late 1996. The data set provides complete global coverage divided into 33 tiles. Ocean pixels are flagged with a nodata value of -9999.<br>For latitudes between -60 and 90 degrees there are 27 tiles, each spanning 50 degrees of latitude (6000 rows) and 40 degrees of longitude (4800 columns). Latitudes between -90 and -60 correspond to Antarctica, which is covered by 6 tiles, each spanning 30 degrees of latitude (3600 rows) and 60 degrees of longitude (7200 columns). The data for Antarctica is also available in a polar stereographic projection consisting of a single tile that has 5400 columns and 5400 rows and a grid spacing of 1000 meters. Elevation data for all tiles is stored as signed 2-byte integers in flat binary (row major, no header) files with the MSB (most significant byte first) byte order and units of meters above mean sea level. Georeferencing information is in a separate ASCII header (HDR) file. The reference ellipsoid/datum is WGS84.<br>''This description is provided by Rivix LLC'' | |||
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* '''NED''' (National Elevation Dataset; USA)<br> | * '''NED''' (National Elevation Dataset; USA)<br> | ||
Revision as of 18:29, 3 March 2008
Topography data
- ETOPO2 (Global 2-minute gridded elevation data)
Original data source | Download data - ETOPO5 (Global 5-minute gridded elevation data)
| Data description | Original data source | Download data |
|---|---|---|
| Data description | ||
| ETOPO5 (Earth Topography 5-minute) is a gridded elevation (land) and bathymetry (sea floor) data set for the entire Earth at a grid spacing of 5 minutes (1/12 of a degree or 300 arcseconds). The entire data set consists of a single file which has 4320 columns and 2160 rows. This data set was compiled using data from many different sources by the National Geophysical Data Center (NGDC), which is part of the National Oceanic and Atmospheric Administration (NOAA). Most of the data set dates to 1988, except for a small area in Canada that was regridded in 1990. Elevation values are stored in a flat binary file (row major, no header) as signed 2-byte integers, and are available with both the LSB (least significant byte first) and MSB (most significant byte first) byte orders. The elevation units are meters. Note - The newer GLOBE and GTOPO30 data sets also provide global coverage at the much higher resolution of 30 arcseconds. This description is provided by Rivix LLC | ||
- GLOBE (Global Land One-km Base Elevation)
| Data description | Original data source | Download data |
|---|---|---|
| Data description | ||
| GLOBE is an international effort to create a global digital elevation model (DEM) on a nominal 1-kilometer grid. Data from a variety of sources was compiled and independently peer-reviewed to provide 30 arcsecond grid spacing, which corresponds to approximately one kilometer near the equator. GLOBE Version 1.0 was completed and released in 1999. GLOBE is an activity of the Committee on Earth Observation Satellites (CEOS), and is part of Focus 1 of the International Geosphere-Biosphere Programme's Data and Information System (IGBP-DIS). GLOBE coverage is divided into sixteen tiles. Each tile spans 90 degrees of longitude has 10800 columns. Tiles bordering the equator span 50 degrees of latitude and have 6000 rows, while the remaining tiles span 40 degrees and have 4800 rows. Elevation data is stored as signed 2-byte integers in flat binary (row major) files with the LSB (least significant byte first) byte order and units of meters. Header files for several formats are also available. Bathymetric data is not yet included but is planned for a future version of GLOBE. This description is provided by Rivix LLC | ||
- GTOPO30 (Global 30 Arc-Second Elevation Data Set)
| Data description | Original data source | Download data |
|---|---|---|
| Data description | ||
| GTOPO30 is a global digital elevation model (DEM) with a horizontal grid spacing of 30 arcseconds (about 1 kilometer at the equator). GTOPO30 was developed through a collaborative effort led by staff at the USGS EROS Data Center. NASA and several other organizations around the world contributed to the project, which was completed in late 1996. The data set provides complete global coverage divided into 33 tiles. Ocean pixels are flagged with a nodata value of -9999. For latitudes between -60 and 90 degrees there are 27 tiles, each spanning 50 degrees of latitude (6000 rows) and 40 degrees of longitude (4800 columns). Latitudes between -90 and -60 correspond to Antarctica, which is covered by 6 tiles, each spanning 30 degrees of latitude (3600 rows) and 60 degrees of longitude (7200 columns). The data for Antarctica is also available in a polar stereographic projection consisting of a single tile that has 5400 columns and 5400 rows and a grid spacing of 1000 meters. Elevation data for all tiles is stored as signed 2-byte integers in flat binary (row major, no header) files with the MSB (most significant byte first) byte order and units of meters above mean sea level. Georeferencing information is in a separate ASCII header (HDR) file. The reference ellipsoid/datum is WGS84. This description is provided by Rivix LLC | ||
- NED (National Elevation Dataset; USA)
Data description Original data source Download data
- SRTM (Shuttle Radar Topography Mission)
Data description Original data source Download data
