Shuttle Radar Topography Mission (SRTM) Elevation Dataset 2010


Identification_Information:
Citation:
Citation_Information:
Originator:National Aeronautics and Space Administration (NASA)
Originator:National Imagery and Mapping Agency (NIMA)
Originator:German Aerospace Center (DLR)
Originator:Italian Space Agency (ASI)
Publication_Date:13-JAN-10
Title:
Shuttle Radar Topography Mission (SRTM) Elevation Dataset 2010
Geospatial_Data_Presentation_Form:raster digital data
Publication_Information:
Publication_Place:Sioux Falls, SD
Publisher:U.S. Geological Survey
Online_Linkage: http://earthexplorer.usgs.gov
Online_Linkage: http://www.pasda.psu.edu
Description:
Abstract:
The Shuttle Radar Topography Mission (SRTM) is a partnership between
NASA and the National Geospatial-Intelligence Agency (NGA). Flown aboard the NASA
Space Shuttle Endeavour (11-22 February 2000), SRTM fulfilled its mission to map the
world in three dimensions. The USGS is under agreement with NGA and NASA's Jet
Propulsion Laboratory to distribute the C-band data. SRTM utilized dual Spaceborne
Imaging Radar (SIR-C) and dual X-band Synthetic Aperture Radar (X-SAR) configured as
a baseline interferometer to successfully collect data over 80 per cent of the
Earth's land surface, everything between 60 degrees North and 56 degrees South
latitude. 
Purpose:
SRTM data is being used to generate a digital topographic map of the Earth's land surface with data points spaced every 1 arc second for the United States of latitude and longitude (approximately 30 meters). The SRTM "finished" data meet the absolute horizontal and vertical accuracies of 20 meters (circular error at 90% confidence) and 16 meters (linear error at 90% confidence), respectively, as specified for the mission.
Supplemental_Information:
 Available Products:
Finished grade C-band data United States 1 arc-second (~30 meters) and Global
Coverage 3 arc-second ( ~ 90 meters) :

SRTM data at 1 arc second (30 meter) is currently available for the United States,
its territories and possessions. SRTM data at 3 arc-second (90 meters) is currently
available for global coverage between 60 degrees North and 56 degrees South latitude.
  Raster size is 1 degree tiles.   The data is expressed in geographic coordinates
(latitude/longitude) and is horizontally referenced to WGS84 and vertically
referenced to the EGM96 Geoid.
Formats:
1. BIL is a non-proprietary format created by running the GRIDIMAGE command in Arc.
The BIL format will be more compact that the ArcGrid format. It consists of an
integer binary file with accompanying ASCII descriptor files. The BIL integer format
is recommended for software packages that do not support floating-point data. 

The data is a simple binary raster format (signed integer data, 16 bit). There is an
accompanying ASCII header file that provides file size information (number of rows
and columns). The data are stored in row major order (all the data for row 1,
followed by all the data for row 2, etc.). 

2. DTED - Digital Terrain Elevation Data

  Time_Period_of_Content:  
    Time_Period_Information:  
       
        Single_Date/Time:  
          Calendar_Date:  February 2002
  Spatial_Domain:  
    Bounding_Coordinates:  
      West_Bounding_Coordinate:  -75
      East_Bounding_Coordinate:  -74
      North_Bounding_Coordinate:  40
      South_Bounding_Coordinate:  39
    Data_Set_G-Polygon:  
      Data_Set_G-Polygon_Outer_G-Ring:  
         
          G-Ring_Latitude:  40
          G-Ring_Longitude:  -75
         
          G-Ring_Latitude:  39
          G-Ring_Longitude:  -75
         
          G-Ring_Latitude:  39
          G-Ring_Longitude:  -74
         
          G-Ring_Latitude:  40
          G-Ring_Longitude:  -74
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:February 2002
Currentness_Reference:
publication date
Status:
Progress:In work
Maintenance_and_Update_Frequency:As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:-75
East_Bounding_Coordinate:-74
North_Bounding_Coordinate:40
South_Bounding_Coordinate:39
Keywords:
Theme:
Theme_Keyword_Thesaurus:GCMD Parameter Keywords
Theme_Keyword:EARTH SCIENCE
Theme_Keyword:LAND SURFACE
Theme_Keyword:TOPOGRAPHY
Theme_Keyword:LANDFORMS
Theme_Keyword:TERRAIN ELEVATION
Theme_Keyword:1-DEGREE DEM
Theme_Keyword:1-ARC-SECOND DEM
Theme_Keyword:CARTOGRAPHY
Theme_Keyword:DEM
Theme_Keyword:DIGITAL ELEVATION MODEL
Theme_Keyword:DIGITAL SURFACE MODEL
Theme_Keyword:DIGITAL MAPPING
Theme_Keyword:EDC
Theme_Keyword:EROS
Theme_Keyword:GEODATA
Theme_Keyword:GIS
Theme_Keyword:MAPPING
Theme_Keyword:RASTER
Theme_Keyword:USGS
Theme_Keyword:Imagery/Base Maps/Earth Cover
Theme_Keyword:30-meter resolution- 1 arc second of the United States
Theme_Keyword:Elevation
Theme_Keyword:SRTM
Theme_Keyword:Mapping
Theme_Keyword:Topography
Theme_Keyword:90-meter resolution- 3 arc second of the world
Theme_Keyword:DTED
Theme_Keyword:NASA
Theme_Keyword:NGA
Theme_Keyword:Shuttle Radar Topography Mission
Theme:
Theme_Keyword_Thesaurus:ISO 19115 Topic Categories
Place:
Place_Keyword_Thesaurus:GCMD Location Keywords
Place_Keyword:UNITED STATES
Place_Keyword:UNITED STATES OF AMERICA
Place_Keyword:Pennsylvania
Access_Constraints:None
Use_Constraints:
None.  Acknowledgement of the originating agencies would be appreciated in products derived from these data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person:Customer Services Representative
Contact_Organization:EROS Data Center
Contact_Address:
Address_Type:mailing and physical address
Address:
U.S. Geological Survey EROS Data Center
City:Sioux Falls
State_or_Province:SD
Postal_Code:57198-0001
Country:United States
Contact_Voice_Telephone:605-594-6151
Contact_Facsimile_Telephone:605-594-6589
Contact_Electronic_Mail_Address:lta@usgs.gov
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2; ESRI ArcCatalog 8.2.0.700
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Data_Quality_Information:
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The mission objective is to produce digital topographic map products with <=20 m absolute horizontal circular accuracy. All accuracies are quoted at the 90% level, consistent with National Map Accuracy Standards.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The mission objective is to produce digital topographic map products with <=16 m absolute vertical height accuracy and <= 10 m relative vertical height accuracy. All accuracies are quoted at the 90% level, consistent with National Map Accuracy Standards.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:NASA, NIMA, DLR, and ASI
Title:
SRTM Data Collection
Source_Citation_Abbreviation:
SRTM 2000
Source_Information:
Source_Citation:
Citation_Information:
Originator:Jet Propulsion Laboratory
Title:
JPL Processing
Online_Linkage: <ftp://edcsgs9.cr.usgs.gov/pub/srtm>
Source_Citation_Abbreviation:
JPL 2002
Source_Information:
Source_Citation:
Citation_Information:
Originator:U.S. Geological Survey EROS Data Center
Title:
EDC Processing
Online_Linkage: <http://seamless.usgs.gov>
Source_Citation_Abbreviation:
EDC 2002
Process_Step:
Process_Description:
SRTM data is being processed in a systematic fashion using the SRTM Ground Data Processing System (GDPS) supercomputer system at the Jet Propulsion Laboratory. Data are being mosaicked into approximately 14,000 one degree by one degree cells and formatted according to the Digital Terrain Elevation Data (DTED) specification for delivery to NIMA, who will use it to update and extend their DTED products. Data are being processed on a continent-by-continent basis beginning with North America. NIMA will apply several post-processing steps to these data including editing, spike and well removal, water body leveling and coastline definition. Following these "finishing" steps data will be returned to NASA for distribution to the scientific and civil user communities, as well as the public.
However, in advance of that, some portion of the data processed by the GDPS is being released to Principal Investigators selected by NASA under the Solid Earth and Natural Hazards program, in response to requests for specific research programs.
Each SRTM data tile contains a mosaic of elevations generated by averaging all data takes that fall within that tile. Since the primary error source in synthetic aperture radar data is speckle, which has the characteristics of random noise, combining data through averaging reduces the error by the square root of the number of data takes used. In the case of SRTM the number of data takes could range from a minimum of one (in a very few cases) up to as many as ten.
As with all digital geospatial data sets, users of SRTM must be aware of certain characteristics of the data set (resolution, accuracy, method of production and any resulting artifacts, etc.) in order to better judge its suitability for a specific application. A characteristic of SRTM that renders it unsuitable for one application may have no relevance as a limiting factor for its use in a different application.
No editing has been performed on the data, and the elevation data in particular contain numerous voids and other spurious points such as anomalously high (spike) or low (well) values. Water bodies will generally not be well-defined - in fact since water surfaces generally produce very low radar backscatter they will appear quite "noisy" or rough, in the elevations data. Similarly, coastlines will not be well-defined.
Source_Used_Citation_Abbreviation:
SRTM 2000
Source_Produced_Citation_Abbreviation:
JPL 2002
Process_Step:
Process_Description:
Process SRTM data to a digital surface model in grid format.  To complete this step run SRTM2DSM.AML which unzips the data files, renames the file extensions from .HGT to .BIL, creates a .HDR file, creates a GRID, converts 16-bit signed integer height data, sets (-32768) values to NODATA, define projection as geographic with WGS84 datum, and converts to real data type.
Source_Used_Citation_Abbreviation:
JPL 2002
Source_Produced_Citation_Abbreviation:
EDC 2002
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method:Raster
Raster_Object_Information:
Raster_Object_Type:Grid Cell
Row_Count:158451
Column_Count:327635
Vertical_Count:1
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Geographic_Coordinate_Units:Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name:D_WGS_1984
Ellipsoid_Name:WGS_1984
Semi-major_Axis:6378137.000000
Denominator_of_Flattening_Ratio:298.257224
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person:Customer Services Representative
Contact_Organization:EROS Data Center
Contact_Address:
Address_Type:mailing and physical address
Address:
U.S. Geological Survey EROS Data Center
City:Sioux Falls
State_or_Province:SD
Postal_Code:57198
Country:USA
Contact_Voice_Telephone:605-594-6151
Contact_Facsimile_Telephone:605-594-6589
Contact_Electronic_Mail_Address:custserv@usgs.gov
Resource_Description:Downloadable Data
Distribution_Liability:
Although these data have been processed successfully on a computer system at the U.S. Geological Survey, EROS Data Center, no warranty expressed or implied is made by either regarding the utility of the data on any system, nor shall the act of distribution constitute any such warranty. The USGS will warrant the delivery of this product in computer-readable format and will offer appropriate adjustment of credit when the product is determined unreadable by correctly adjusted computer peripherals, or when the physical medium is delivered in damaged condition. Requests for adjustments of credit must be made within 90 days from the date of this shipment from the ordering site.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size:0.000
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Organization:Pennsylvania Spatial Data Access (PASDA)
Contact_Address:
Address_Type:mailing address
Address:
115 Land and Water research building
City:University Park
State_or_Province:Pennsylvania
Postal_Code:16802
Country:United States
Contact_Voice_Telephone:814-865-8792
Contact_Electronic_Mail_Address:pasda@psu.edu
Distribution_Liability:
The USER shall indemnify, save harmless, and, if requested, defend those parties involved with the development and distribution of this data, their officers, agents, and employees from and against any suits, claims, or actions for injury, death, or property damage arising out of the use of or any defect in the FILES or any accompanying documentation. Those parties involved with the development and distribution excluded any and all implied warranties, including warranties or merchantability and fitness for a particular purpose and makes no warranty or representation, either express or implied, with respect to the FILES or accompanying documentation, including its quality, performance, merchantability, or fitness for a particular purpose. The FILES and documentation are provided "as is" and the USER assumes the entire risk as to its quality and performance. Those parties involved with the development and distribution of this data will not be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the FILES or any accompanying documentation.
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Metadata_Reference_Information:
Metadata_Date:201108
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person:Customer Services Representative
Contact_Organization:EROS Data Center
Contact_Address:
Address_Type:mailing and physical address
Address:
U.S. Geological Survey EROS Data Center
City:Sioux Falls
State_or_Province:SD
Postal_Code:57198
Country:USA
Contact_Voice_Telephone:605-594-6151
Contact_Facsimile_Telephone:605-594-6589
Contact_Electronic_Mail_Address:custserv@usgs.gov
Metadata_Standard_Name:FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version:FGDC-STD-001-1998
Metadata_Time_Convention:local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile mp version 2.7.3 on Tue Oct 29 11:55:12 2002
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