Global Land Survey Digital Elevation Model (GLSDEM)

Federal Geographic Data Committee (FGDC) Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: USGS

Publication_Date: Unknown

Title: Global Land Survey Digital Elevation Model (GLSDEM)

Edition:

Geospatial_Data_Presentation_Form:

Series_Information:

Series_Name:

Issue_Identification:

Publication_Information:

Publication_Place: College Park, Maryland

Publisher: Global Land Cover Facility, University of Maryland

Other_Citation_Details:

Online_Linkage: http://glcf.umiacs.umd.edu/data/glsdem/index.shtml

Description:

Abstract:

The Global Land Survey Digital Elevation Model (GLSDEM) is a spatial data collection crucial to new global imagery products from NASA and the USGS. In the late 1990s, the U.S. Congress set aside funding to stimulate the use of remotely sensed imagery and products through the Science Data Purchase (SDP) program. One of the SDP collections is GeoCover - a coordinated dataset of orthorectified Landsat imagery available in three epochs. The GeoCover collection was orthorectified using classified control points and the GTOPO30 global elevation model. Since it first became available, the GeoCover collection was and still is a big success, encouraging use of remotely sensed imagery for Earth science research around the world, and bridging the use of imagery into myriad other uses. The geodetic accuracy of the input elevation model, however, was less than ideal so that some GeoCover scenes suffered from poor geo-registration. With the advent of higher precision DEMs for the entire planet, the Landsat images used to make the GeoCover collection were reprocessed for higher geo-locational quality into the Global Land Survey (GLS) collection. The GLS collection contains the same three epochs as in GeoCover - 2000, 1990, 1975 - plus a fourth epoch focused on 2005. The GLS2005 collection includes imagery from the TM, ETM+ and ALI sensors. The GLS collection was made possible by the development of more accurate elevation models with global or regional coverage, including the National Elevation Dataset (NED) of the USA, the Canadian Digital Elevation Dataset (CDED) of Canada and the Shuttle Radar Topography Mission (SRTM) covering most of the globe. In order to orthorectify the GLS scenes, the elevation data was coordinated into the GLSDEM product. The GLSDEM product is of 3 arc second (90m) resolution and in Geographic coordinates with a WGS-84 datum. GLCF produces GLSDEM files in WRS-2 tiles in the GeoTIFF format, UTM projection and horizontal WGS 84 datum of the corresponding GLS datasets. For each path/row, the original USGS Degree tiles are mosaicked and subset with a 9km buffer to reproduce the GLSDEMs into the Landsat WRS-2 tiling system. The GLSDEM degree tiles may be obtained from EROS Data Center, USGS or the GLCF. The WRS-2 edition of the GLSDEMs is available only through the GLCF.

Purpose:

Not Available

Supplemental_Information:

Not Available

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Description_of_Geographic_Extent:

Bounding_Coordinates:

West_Bounding_Coordinate: -180.0

East_Bounding_Coordinate: 180.0

North_Bounding_Coordinate: 90.0

South_Bounding_Coordinate: -90.0

Keywords:

Theme:

Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS

Theme_Keyword_Thesaurus: GCMD PLATFORM

Theme_Keyword_Thesaurus: GCMD INSTRUMENT

Theme_Keyword_Thesaurus: PROJECT

Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS

Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY

Theme_Keyword_Thesaurus: DATA SET LANGUAGE

Theme_Keyword: EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > LANDFORMS

Theme_Keyword: EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION

Theme_Keyword: DEM > DIGITAL ELEVATION MODEL

Theme_Keyword: LANDSAT-7

Theme_Keyword: ALI > ADVANCED LAND IMAGER

Theme_Keyword: ETM+ > ENHANCED THEMATIC MAPPER PLUS

Theme_Keyword: TM > THEMATIC MAPPER

Theme_Keyword: ESIP > EARTH SCIENCE INFORMATION PARTNERS PROGRAM

Theme_Keyword: REASON > RESEARCH, EDUCATION, AND APPLICATIONS SOLUTION NETWORK

Theme_Keyword: Digital Elevation Model

Theme_Keyword: Land Cover

Theme_Keyword: Model

Theme_Keyword: ELEVATION

Theme_Keyword: ENGLISH

Place:

Place_Keyword_Thesaurus: GCMD

Place_Keyword: GEOGRAPHIC REGION > GLOBAL

Access_Constraints: Not Available

Use_Constraints:

Use is free to all; effectively held by USGS & NASA. The ultimate copyright and ownership of the product, however, is held by the citizens of the United States of America, the Republic of Germany, and the Dominion of Canada. As a courtesy, please credit the Global Land Cover Facility (GLCF) as the source for this data set in some manner. Our suggestion: Source for this data set was the Global Land Cover Facility, www.landcover.org.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: GLOBAL LAND COVER FACILITY

Contact_Position: TECHNICAL CONTACT

Contact_Address:

Address_Type: Mailing and Physical Address

Address: Global Land Cover Facility

Address: 3166 A.V. Williams Bldg

Address: University of Maryland

City: College Park

State_or_Province: MD

Postal_Code: 20742

Country: USA

Contact_Electronic_Mail_Address: glcf@umd.edu

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Not Available

Logical_Consistency_Report:

Not Available

Completeness_Report:

Not Available

Lineage:

Process_Step:

Process_Description:

Not Available

Process_Date: Unknown

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 90 m

Longitude_Resolution: 90 m

Geographic_Coordinate_Units: Decimal degrees

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: UMD/GLCF > Global Land Cover Facility, University of Maryland

Contact_Person: GLOBAL LAND COVER FACILITY

Contact_Position: DATA CENTER CONTACT

Contact_Address:

Address_Type: Mailing and Physical Address

Address: Global Land Cover Facility

Address: 3166 A.V. Williams Bldg

Address: University of Maryland

City: College Park

State_or_Province: MD

Postal_Code: 20742

Country: USA

Contact_Electronic_Mail_Address: glcf@umd.edu

Resource_Description: GLCF_glsdem

Distribution_Liability:

Not Available

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://glcf.umiacs.umd.edu/

Access_Instructions:

DATA CENTER URL

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

ftp://ftp.glcf.umd.edu/glcf/GLSDEM/

Access_Instructions:

Global Land Survey Digital Elevation Model (GLSDEM)

Fees: No Fees

Metadata_Reference_Information:

Metadata_Date: 20110203

Metadata_Review_Date: 20110204

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: TYLER B. STEVENS

Contact_Position: DIF AUTHOR

Contact_Address:

Address_Type: Mailing and Physical Address

Address: NASA Goddard Space Flight Center

Address: Global Change Master Directory

City: Greenbelt

State_or_Province: MD

Postal_Code: 20771

Country: USA

Contact_Voice_Telephone: (301) 614-6898

Contact_Facsimile_Telephone: 301-614-5268

Contact_Electronic_Mail_Address: Tyler.B.Stevens@nasa.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time