Global Land Survey Digital Elevation Model (GLSDEM)

Federal Geographic Data Committee (FGDC) Metadata:


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.umd.edu/data/glsdem/
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
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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
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 90 m
Longitude_Resolution: 90 m
Geographic_Coordinate_Units: Decimal degrees
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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.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
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Metadata_Reference_Information:
Metadata_Date: 20110203
Metadata_Review_Date: 20140915
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
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