United States Average Monthly or Annual Dew Point Temperature, 1961-90

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:

Chris Daly and George Taylor of the Spatial Climate Analysis Service at Oregon State University.

Publication_Date: 200008

Title:

United States Average Monthly or Annual Dew Point Temperature, 1961-90

Publication_Information:

Publication_Place: Corvallis, Oregon, USA

Publisher:

Spatial Climate Analysis Service at Oregon State University (SCAS/OSU)

Description:

Abstract:

Grids of mean daily dew point temperature were created by applying the PRISM modeling system to dew point depression, which is the difference between the minimum ambient temperature and the dew point temperature. Station data for mean monthly minimum daily temperature and mean monthly minimum and maximum dew point temperature were obtained from the National Climatic Data Center. Point values of depressions for both minimum and maximum daily dew point were calculated from these station data.

Purpose:

Display and/or analyses requiring spatially distributed monthly or annual dew point temperature for the climatological period 1961-90.

Supplemental_Information:

Grids of mean monthly minimum and maximum dew point depression were produced with the PRISM modeling system. These grids were then added to the 1961-1990 mean monthly minimum daily temperature grids to obtain mean monthly minimum and maximum dew point temperature. The minimum and maximum values were averaged to obtain monthly mean dew point temperature. An annual grid was produced by averaging the monthly grids. A Gaussian filter was applied to increase the resolution of the grids from the base resolution 2.5 arc-minutes (~4 km) to 1.25 arc-minutes (~2 km). This filter is a modification of the Barnes filter (Barnes, 1964), originally adapted by Dr. Stephen Esbensen of Oregon State University, and later modified for use here by Wayne P.Gibson, also of Oregon State University.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19610101

Ending_Date: 19901231

Currentness_Reference:

Climatological period from which the point observations were taken.

Status:

Progress: Complete

Maintenance_and_Update_Frequency:

None planned for the 1961-90 climatological period. However, this data set will most likely be updated in 2001 for the new 1971-2000 climatological period.

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -126.01041666666

East_Bounding_Coordinate: -64.989583333333

North_Bounding_Coordinate: 50.010416666666

South_Bounding_Coordinate: 24.072916666666

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: raster data

Theme_Keyword: dew point temperature

Theme_Keyword: grid cell

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: United States, USA

Access_Constraints: Access pursuant to license agreement

Use_Constraints:

Acknowledgement of the following agencies in products derived from these data: Spatial Climate Analysis Service at Oregon State University and Climate Source, Inc.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: George H. Taylor, State Climatologist

Contact_Address:

Address_Type: mailing address

Address:

Strand Ag Hall 316, Spatial Climate Analysis Service, Oregon State University

City: Corvallis

State_or_Province: OR

Postal_Code: 97331-2209

Country: USA

Contact_Voice_Telephone: (541) 737-5705

Contact_Facsimile_Telephone: (541) 737-5710

Contact_Electronic_Mail_Address: taylor@oce.orst.edu

Security_Information:

Security_Classification_System: None

Security_Classification: Unclassified

Security_Handling_Description: None

Native_Data_Set_Environment: SunOS, 5.5.1, sun4m UNIX

Data_Quality_Information:

Logical_Consistency_Report:

All data were based on the same averaging period (1961-1990). Similar quality assurance procedures were used with all input data sets.

Completeness_Report:

Point estimates of climate originated from the following source: National Weather Service Cooperative (COOP) stations. All COOP station data were subjected to quality control checks by the National Climatic Data Center (NCDC) and Spatial Climate Analysis Service.

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: National Climatic Data Center (NCDC)

Publication_Date: 1991

Title:

U.S. National 1961-1990 Climate Normals, Climatography of the United States No. 81

Publication_Information:

Publication_Place: Asheville, NC, USA

Publisher: National Climatic Data Center (NCDC)

Type_of_Source_Media: digital files

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19610101

Ending_Date: 19901231

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: CLIM81

Source_Contribution:

Location and values of known average monthly and annual dew point temperature

Source_Information:

Source_Citation:

Citation_Information:

Originator: Defense Mapping Agency

Publication_Date: 1985

Title:

1:250,000-scale Digital Elevation Models (DEM) also known as 1-Degree DEM's

Online_Linkage: <URL:http://edcwww.cr.usgs.gov/doc/edchome/ndcdb/ndcdb.html>

Publication_Information:

Publication_Place: Washington, DC

Publisher: U.S. Geological Survey

Type_of_Source_Media: digital files

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1985

Source_Currentness_Reference: Publication Date

Source_Citation_Abbreviation: DEM

Source_Contribution:

Terrain surface input to PRISM model for estimation of dew point temperature between known points.

Process_Step:

Process_Description:

It is beyond the scope of this metadata to document the processes involved in generating spatially gridded dew point temperature using the PRISM model. However, the processes are documented in numerous conference proceedings and journal articles. The references can be found online at <URL:http://www.ocs.orst.edu/prism/>.

Process_Date: 200008

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 1245

Column_Count: 2929

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: .0208333333

Longitude_Resolution: .0208333333

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: World Geodetic System 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: average dew point temperature grid cell value

Entity_Type_Definition: ASCII values

Entity_Type_Definition_Source: Self-evident

Attribute:

Attribute_Label: average dew point temperature grid cell value

Attribute_Definition: spatially gridded average dew point temperature

Attribute_Definition_Source:

Daly, C., R.P. Neilson, and D.L. Phillips, 1994: A Statistical-Topographic Model for Mapping Climatological Precipitation over Mountainous Terrain. J. Appl. Meteor., 33,140-158.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -247

Range_Domain_Maximum: 252

Attribute_Units_of_Measure: Degrees C times 10

Attribute_Measurement_Resolution: 1

Enumerated_Domain:

Enumerated_Domain_Value: <=-248

Enumerated_Domain_Value_Definition: no data available or outside of range domain

Enumerated_Domain_Value_Definition_Source: Spatial Climate Analysis Service PRISM Project

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Climate Source, Inc.

Contact_Address:

Address_Type: mailing address

Address: 946 NW Circle Blvd. #222

City: Corvallis

State_or_Province: OR

Postal_Code: 97330-1410

Country: USA

Contact_Voice_Telephone:

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: info@climatesource.com

Distribution_Liability:

This is a license agreement and not an agreement for sale. This agreement between the end user (Licensee) and The Climate Source (TCS) grants certain limited rights to use proprietary climate data (the Database) distributed by TCS. All rights not specifically granted in this agreement are reserved to TCS. Licensee acknowledges that the Database may contain some defects, errors, or inconsistencies. TCS does not warrant that the Database will meet the needs of the Licensee or that all defects can or will be corrected. TCS assumes no responsibility for decisions, judgments, or analyses which are based in any way on the Database.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ARC/INFO ASCII Grid

Digital_Transfer_Option:

Offline_Option:

Offline_Media: CD ROM

Recording_Format: ISO 9660

Fees: Packaged price per CD

Technical_Prerequisites: CD ROM drive with ISO 9660 software driver

Metadata_Reference_Information:

Metadata_Date: 20000925

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Climate Source, Inc.

Contact_Address:

Address_Type: mailing address

Address: 946 NW Circle Blvd. #222

City: Corvallis

State_or_Province: OR

Postal_Code: 97330-1410

Country: USA

Contact_Voice_Telephone:

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: info@climatesource.com

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Security_Information:

Metadata_Security_Classification_System: None

Metadata_Security_Classification: Unclassified

Metadata_Security_Handling_Description:

None