2.5-minute Digital Elevation Model (DEM) for the Conterminous U.S.

Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator: Spatial Climate Analysis Service at Oregon State University
Publication_Date: 199504
Title:
2.5-minute Digital Elevation Model (DEM) for the Conterminous U.S.
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Corvallis, Oregon ,USA
Publisher: Spatial Climate Analysis Service at Oregon State University
Online_Linkage: <URL:ftp://ftp.ncdc.noaa.gov/pub/data/prism100/us_25m.dem.gz>
Description:
Abstract:
This digital elevation grid is used by PRISM (Parameter-elevation Regressions on Independent Slopes Model) to generate US precipitation and temperature maps. The DEM originated with the EROS Data Center's 3-arc-second DEM's for the U.S. The DEM's were then mosaiced and resampled to 15-arc-second, and finally a modified Barnes filter (Barnes, 1964) was applied to the 15-arc-second coverage to smooth the DEM to 2.5-arc-minute resolution. For more information on the EROS Data Center 3-arc-second DEM, go to

<URL:http://edcwww.cr.usgs.gov/Webglis/glisbin/guide.pl/glis/hyper/guide/usgs_dem>.

Purpose:
This DEM provides a useful reference point from which to interpret the precipitation and temperature patterns, and is a clean coverage that can be used for other purposes. Also, we especially encourage those of you who are reprojecting the PRISM maps into other coordinate systems to accompany the maps with the DEM.
Supplemental_Information:
If you already have a DEM in your working projection/resolution, differences between the two DEMs (once the PRISM DEM is reprojected) may give you a feel for uncertainties introduced through (1) reprojection; (2) changes in resolution; and (3) basic differences in origins of the two DEMs. Keep in mind that the PRISM coverages reflect the characteristics of the DEM used, and may not reflect your DEM terrain patterns.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1995
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -125.0208333
East_Bounding_Coordinate: -66.47916666
North_Bounding_Coordinate: 49.9375
South_Bounding_Coordinate: 24.0625
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: raster data
Theme_Keyword: DEM
Theme_Keyword: Digital Elevation Model
Theme_Keyword: grid cell
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Conterminous USA
Access_Constraints: No restrictions apply
Use_Constraints:
Acknowledgement of the Spatial Climate Analysis Service and Oregon Climate Service at Oregon State University.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne Gibson
Contact_Organization: Oregon State University
Contact_Position: Senior Research Assistant
Contact_Address:
Address_Type: mailing address
Address: Strand Ag Hall 320
City: Corvallis
State_or_Province: Oregon
Postal_Code: 97331-2209
Country: USA
Contact_Voice_Telephone: (541) 7375696
Contact_Facsimile_Telephone: (541) 7375710
Contact_Electronic_Mail_Address: gibson@coas.oregonstate.edu
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2; ESRI ArcCatalog 8.1.2.671
Data_Quality_Information:
Completeness_Report:
A modified Barnes filter (Barnes, 1964) was applied to the UGSG 15-arc-second coverage to smooth the DEM to 2.5-arc-minute resolution.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Accuracy of this data set is based on the original specification of the Defense Mapping Agency (DMA) 1 degree digital elevation models (DEM). The stated accuracy of the original DEMs are 130 m circular error with 90% probability.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 130 m with 90% probability.
Horizontal_Positional_Accuracy_Explanation: The broad DMA production objective for 1-degree DEM's.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: United States Geological Survey (USGS)
Title: 1:250,000 Digital Elevation Models
Publication_Information:
Publication_Place: USA
Publisher: United States Geological Survey (USGS)
Type_of_Source_Media: digital files
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1967
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: DEM
Source_Contribution: grid cells representing elevation above sea level
Process_Step:
Process_Description:
It is beyond the scope of this metadata to document the processes involved in generating the 2.5-min DEM from the 15-sec DEM. However, the technique is well documented in Barnes, S.L. 1964. A technique for maximizing details in numerical weather map analysis. Journal of Applied Meteorology, 3: 396-409.
Process_Step:
Process_Description: Metadata imported.
Source_Used_Citation_Abbreviation: C:\DOCUME~1\mdoggett\LOCALS~1\Temp\xml12F.tmp
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 621
Column_Count: 1405
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.0416666666
Longitude_Resolution: 0.0416666666
Geographic_Coordinate_Units: Decimal degrees
Planar:
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 0.041667
Ordinate_Resolution: 0.041667
Geodetic_Model:
Horizontal_Datum_Name: World Geodetic Spheroid 1972 (WGS 1972)
Ellipsoid_Name: WGS72
Semi-major_Axis: 6378135.0
Denominator_of_Flattening_Ratio: 298.26
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: elevation above mean sea level
Attribute:
Attribute_Label: Value
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -73
Range_Domain_Maximum: 4005
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 1
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -999
Enumerated_Domain_Value_Definition: no data available or outside of range domain
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Value
Attribute:
Attribute_Label: Count
Overview_Description:
Entity_and_Attribute_Overview:
Cell values are elevation above mean sea level in meters rounded to the nearest integer.
Distribution_Information:
Resource_Description: Downloadable Data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
File_Decompression_Technique: GNU zip
Transfer_Size: 874Kb
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <URL:ftp://ftp.ncdc.noaa.gov/pub/data/prism100/us_25m.dem.gz>
Metadata_Reference_Information:
Metadata_Date: 20020807
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Oregon State University
Contact_Person: Wayne Gibson
Contact_Position: Senior Research Assistant
Contact_Address:
Address_Type: Strand Ag Hall 326
City: Corvallis
State_or_Province: Oregon
Postal_Code: 97331-2209
Country: USA
Contact_Voice_Telephone: (541) 737-5696
Contact_Facsimile_Telephone: (541) 737-5710
Contact_Electronic_Mail_Address: gibson@coas.oregonstate.edu
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
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.7.33 on Tue Feb 24 10:21:48 2004