Shuttle Radar Topography Mission (SRTM) Spatial Metadata Dataset

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

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: 2002

Title:

Shuttle Radar Topography Mission (SRTM) Spatial Metadata Dataset

Edition: 1

Geospatial_Data_Presentation_Form: vector digital data

Publication_Information:

Publication_Place: Sioux Falls, SD

Publisher: U.S. Geological Survey

Online_Linkage: <http://seamless.usgs.gov>

Description:

Abstract:

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.

Purpose:

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.

Supplemental_Information:

Additional Reference: <http://www.jpl.nasa.gov/srtm/index.html> /edcsns18/ned3/srtm/united_states/metadata/citation_abbrev.tif Processing Information: Program Name: SRTM2DSM.AML Purpose: Create a polygonal footprint for each 1x1 degree tile of SRTM data processed. The attributes of each tile, such as, resolution and date processed, are linked to this polygonal footprint. Procedure: Generate footprint Build topology Add and populate attributes Define projection as geographic with WGS84 datum Convert to shapefile Environment: Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2; ESRI ArcInfo Workstation 8.2

Coverage	Upper Left Longitude	Upper Left Latitude	Lower Right Longitude	Lower Right Latitude	Minimum Elevation	Maximum Elevation	Mean Elevation	Std. Dev. Elevation	Elevation Units	Resolution	Horizontal Datum	Vertical Datum	Date Entered in Dataset
N47W122	-122.000138889	46.999861087	-120.999861087	48.000138889	0	2407	906.595911124	466.728644779	METERS	Unknown	WGS84	WGS84_GEOID	26 Jul 02 09:34:46 Friday
N47W121	-121.000138889	46.999861087	-119.999861087	48.000138889	74	2829	983.645921753	435.474548545	METERS	Unknown	WGS84	WGS84_GEOID	26 Jul 02 09:31:37 Friday
N48W122	-122.000138889	47.999861087	-120.999861087	49.000138889	18	3274	1028.430705591	527.757972949	METERS	Unknown	WGS84	WGS84_GEOID	06 Aug 02 11:06:15 Tuesday
N48W121	-121.000138889	47.999861087	-119.999861087	49.000138889	275	2820	1506.487396668	473.516762846	METERS	Unknown	WGS84	WGS84_GEOID	06 Aug 02 11:02:50 Tuesday

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20000211

Ending_Date: 20000222

Currentness_Reference: publication date

Status:

Progress: In work

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate:-121.89360573

East_Bounding_Coordinate:-120.52147844

North_Bounding_Coordinate:48.38073197

South_Bounding_Coordinate:47.50988852

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: USGS

Theme_Keyword: VECTOR

Place:

Place_Keyword_Thesaurus: GCMD Location Keywords

Place_Keyword: UNITED STATES

Place_Keyword: UNITED STATES OF AMERICA

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

Country: USA

Contact_Voice_Telephone: 605-594-6151

Contact_Facsimile_Telephone: 605-594-6589

Contact_Electronic_Mail_Address: custserv@usgs.gov

Native_Data_Set_Environment:

Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2; ESRI ArcCatalog 8.2.0.700

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:

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:

Create a polygonal footprint for each 1x1 degree tile of SRTM data processed. The attributes of each tile, such as, resolution and date processed, are linked to this polygonal footprint. To complete this step run SRTM2DSM.AML which generates a footprint, builds topology, add and populates attributes, defines projections as geographic with WGS84 datum, and converts coverage to shapefile.

Source_Used_Citation_Abbreviation: JPL 2002

Source_Produced_Citation_Abbreviation: EDC 2002

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon

Point_and_Vector_Object_Count: 906

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0002777777778

Longitude_Resolution: 0.0002777777778

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

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Resolution: 1.000000

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: SRTM.elevation_1_meta

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: SRTM.elevation_1_meta.AREA

Attribute:

Attribute_Label: PERIMETER

Attribute:

Attribute_Label: COVERAGE

Attribute_Definition: The name of the source SRTM file without any path information.

Attribute:

Attribute_Label: FULLPATH

Attribute_Definition: The name of the source SRTM file with full path information.

Attribute:

Attribute_Label: XMIN

Attribute_Definition: The minimum x-coordinate.

Attribute:

Attribute_Label: YMIN

Attribute_Definition: The minimum y-coordinate.

Attribute:

Attribute_Label: XMAX

Attribute_Definition: The maximum x-coordinate.

Attribute:

Attribute_Label: YMAX

Attribute_Definition: The maximum y-coordinate.

Attribute:

Attribute_Label: ZMIN

Attribute_Definition: The minimum elevation value.

Attribute:

Attribute_Label: ZMAX

Attribute_Definition: The maximum elevation value.

Attribute:

Attribute_Label: ZMEAN

Attribute_Definition: The mean elevation value.

Attribute:

Attribute_Label: ZSIGMA

Attribute_Definition: The standard deviation of the elevation values.

Attribute:

Attribute_Label: NCOLS

Attribute_Definition: Number of columns.

Attribute:

Attribute_Label: NROWS

Attribute_Definition: Number of rows.

Attribute:

Attribute_Label: ZUNITS

Attribute_Definition: Vertical units.

Attribute:

Attribute_Label: RESOLUTION

Attribute_Definition:

The geographic (x, y) spacing of the elevation postings within the SRTM data.

Attribute:

Attribute_Label: HDATUM

Attribute_Definition: Horizontal datum.

Attribute:

Attribute_Label: VDATUM

Attribute_Definition: Vertical datum.

Attribute:

Attribute_Label: TIMESTAMP

Attribute_Definition:

The time and date on which the SRTM data was most recently processed.

Attribute:

Attribute_Label: SHAPE

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: SHAPE.AREA

Attribute:

Attribute_Label: SHAPE.LEN

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.

Metadata_Reference_Information:

Metadata_Date: 20020912

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