Identification Information

Title Monthly PRISM Dew Point (April/1898)

Date 2013-02-27

Date Type Publication

Cited Responsible Party

Organization Name Chris Daly and Mike Halbleib of the PRISM Group at Oregon State University

Role identify

Presentation Form remote-sensing image

Abstract Spatially distributed monthly and annual average maximum/minimum/dew point temperature. Each file represents 1 month of 1 year for the period January 1997 to the present. Distribution of the point measurements to a spatial grid was accomplished using the PRISM model, developed by Christopher Daly, Director, The PRISM Climate Group, Oregon State University. Care should be taken in estimating temperature values at any single point on the map. Temperature estimated for each grid cell is an average over the entire area of that cell; thus, point temperature can be estimated at a spatial precision no better than half the resolution of a cell. For example, the temperature data were distributed at a resolution of approximately 4km. Therefore, point temperature can be estimated at a spatial precision no better than 2km. However, the overall distribution of temperature features is thought to be accurate. For further information, the online PRISM homepage can be found at URL:http://prism.oregonstate.edu.

Purpose Display and/or analyses requiring spatially distributed monthly or annual average maximum/minimum/dew point temperature for the period 1997-Present

Supplemental Information There are many methods of interpolating temperature from monitoring stations to grid points. Some provide estimates of acceptable accuracy in flat terrain, but few have been able to adequately explain the extreme, complex variations in temperature that occur in mountainous regions. Significant progress in this area has been achieved through the development of PRISM (Parameter-elevation Regressions on Independent Slopes Model). PRISM is an analytical model that uses point data and a digital elevation model (DEM) to generate gridded estimates of monthly and annual average daily maximum/minimum/dew point temperatures (as well as other climatic parameters). PRISM is well suited to regions with mountainous terrain, because it incorporates a conceptual framework that addresses the spatial scale and pattern of temperature. Temperature was modeled monthly. For this application, PRISM was parameterized to use existing 1971-2000 mean daily maximum/minimum/dew point temperature grids as the predictor grids in the interpolation. The PRISM weighting functions for distance, "elevation" (now the 1971-2000 climatology), topographic facet, atmospheric layer, orographic effectiveness, and coastal proximity were all retained. This allowed observed deviations from normal to be interpolated with sensitivity to physiographic factors. An annual average was produced by averaging the monthly grids.

Status Complete

Point of Contact

Individual Name Chris Daly or Mike Halbleib

Organization Name

Position Name

Role Point of contact

Voice (541) 737-2531

Facsimile

Address

Delivery Point Strand Ag Hall 326, PRISM Group, Oregon State University
City Corvallis
Administrative Area Oregon
Postal Code 97331-2209
Country USA

Electronic Mail Address halbleib@coas.oregonstate.edu

Maintenance and Update Frequency As needed

Descriptive Keywords dew_point_temperature, Prism, dew point

Access Constraints Gridded and polygon data, tabular and graphical data retrieved from the map server, and all other data on this web site may be freely reproduced and distributed for non-commercial purposes. When referring to the data, the source must be clearly and prominently stated, and include at a minimum, our name, URL, and data of data creation, for example: PRISM Climate Group, Oregon State University, http://prism.oregonstate.edu, created 4 Feb 2004. Sale or other commercial use of the data must be arranged by contacting the PRISM Climate Group.

Use Constraints Acknowledgement of the following agencies in products derived from these data: The PRISM Climate Group at Oregon State University.

Language English

Topic Category climatologyMeteorologyAtmosphere

Extent

Geographic Bounding Box

West Bound -125.020833333333
East Bound -66.47916757
North Bound 49.9375
South Bound 24.0625

Temporal Extent

Beginning Position 18980401
Ending Position 18980430

Data Quality Information

Horizontal Positional Accuracy Report

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
Horizontal Positional Accuracy Explanation The broad DMA production objective for 1-degree DEM's.

Logical Consistency Report All data were based on the same averaging period (1971-2000). Similar quality assurance procedures were used with all input data sets.

Completeness Report Point estimates of precipitation originated from some or all of the following sources: 1) National Weather Service (NWS) Cooperative (COOP) stations, 2) Natural Resources Conservation Service (NRCS) SNOTEL, 3) United States Forest Service (USFS) and Bureau of Land Management (BLM) RAWS Stations, 4) Bureau of Reclemation (AGRIMET) stations, 5) California Data Exchange Center (CDEC) stations, 6) Storage guages, 7) NRCS Snowcourse stations, 8) Other State and local station networks, 9) Estimated station data, 0) Canadian stations, 10) Upper air stations, and 11) NWS/Federal Aviation Administration (FAA) Automated surface observation stations (ASOS). All COOP station data were subjected to quality control checks by the National Climatic Data Center (NCDC). All COOP, SNOTEL and other data were subjected to further quality control checks by the PRISM Climate Group.

Lineage

Source Information

Source Citation

Source Scale Denominator

Type of Source Media digital files

Source Time Period of Content

Beginning Position 1898-04-01
Ending Position 1898-04-30
Source Currentness Reference ground condition

Source Citation Abbreviation DSI3200

Source Contribution Location and values of known average monthly and annual precipitation

Process Step

Process Description Files were downloaded from the National Climatic Data Center in their native ascii format and reprojected to a byte type geotiff in WGS84. The GDAL (Geospatial Data Abstraction Library) gdalwarp utility was used for both reprojection and file format transformation.

Process Date 2013-04-19

Process Time

Process Contact

Individual Name

Organization Name Earth Data Analysis Center

Position Name Clearinghouse Manager

Role Point of contact

Voice 505-277-3622 ext. 230

Facsimile 505-277-3614

Address

Delivery Point MSC01 1110, Bandelier West Room 118
Delivery Point 1 University of New Mexico
City Albuquerque
Administrative Area NM
Postal Code 87131-0001
Country US

Electronic Mail Address clearinghouse@edac.unm.edu

Monthly PRISM Dew Point (April/1898)

Metadata from the RGIS Metadata Repository

Identification Information

Distribution Information

Spatial Reference Information

Data Quality Information

Metadata Reference Information