National Aeronautics and Space Administration (NASA) National Imagery and Mapping Agency (NIMA) German Aerospace Center (DLR) Italian Space Agency (ASI) 2002 raster digital data Sioux Falls, SD U.S. Geological Survey http://seamless.usgs.gov The Shuttle Radar Topography Mission (SRTM) aboard the Space Shuttle Endeavour, launched on Feb. 11, 2000. SRTM used the same radar instrument that comprised the Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar (SIR-C/X-SAR) that flew twice on the Space Shuttle Endeavour in 1994. SRTM was assigned to collect 3-D measurements of the Earth's surface. To collect the 3-D data, engineers added a 60-meter (approximately 200-foot) mast, installed additional C-band and X-band antennas, and improved tracking and navigation devices. The mission is a cooperative project between NASA, the National Imagery and Mapping Agency (NIMA) of the U.S. Department of Defense and the German and Italian space agencies. It is managed by NASA's Jet Propulsion Laboratory (JPL), Pasadena, CA, for NASA's Earth Science Enterprise, Washington, D.C. The objective of the SRTM mission is to obtain elevation radar data on a near-global scale and generate the most complete high-resolution digital topographic database of the Earth. The information collected by SRTM will be used to provide a tool to enhance the activities of scientists, the military, commercial, and civilian users. Additional Reference: http://www.jpl.nasa.gov/srtm/index.html /edcsns18/ned3/srtm/united_states/metadata/citation_abbrev.tif Processing Information: Program Name: SRTM2DSM_3.AML Purpose: Process srtm data to a digital surface model in grid format. Procedure: Unzip files Rename .HGT to .BIL Create .HDR files Create GRID Convert 16-bit signed integer height data Set (-32768) values to nodata Define projection as geographic with WGS84 datum Convert to real data type Environment: Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2; ESRI ArcInfo Workstation 8.2 Requested area too large for spatial metadata 20000211 20000222 publication date In work As needed -102.0-96.050.025.0 GCMD Parameter Keywords EARTH SCIENCE LAND SURFACE TOPOGRAPHY LANDFORMS TERRAIN ELEVATION 3-DEGREE DEM 3-ARC-SECOND DEM CARTOGRAPHY DEM DIGITAL ELEVATION MODEL DIGITAL SURFACE MODEL DIGITAL MAPPING EDC EROS GEODATA GIS MAPPING RASTER USGS GCMD Location Keywords NORTH AMERICA None None. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Customer Services Representative EROS Data Center mailing and physical address

U.S. Geological Survey EROS Data Center

Sioux Falls SD 57198 USA 605-594-6151 605-594-6589 custserv@usgs.gov Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 8.2.0.700 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. 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. NASA, NIMA, DLR, and ASI SRTM 2000 Jet Propulsion Laboratory ftp://edcsgs9.cr.usgs.gov/pub/srtm JPL 2002 U.S. Geological Survey EROS Data Center http://seamless.usgs.gov EDC 2002 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. SRTM 2000 JPL 2002 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. JPL 2002 EDC 2002 Metadata imported. D:\meta\NA_3_ELEVATION.txt Raster Grid Cell 61232 432096 1 row and column 0.000833 0.000833 D_WGS_1984 WGS_1984 6378137.000000 298.257224 Customer Services Representative EROS Data Center mailing and physical address

U.S. Geological Survey EROS Data Center

Sioux Falls SD 57198 USA 605-594-6151 605-594-6589 custserv@usgs.gov Downloadable Data 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. 0.000 20030418 Customer Services Representative EROS Data Center mailing and physical address

U.S. Geological Survey EROS Data Center

Sioux Falls SD 57198 USA 605-594-6151 605-594-6589 custserv@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile