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Variables Details
: (EM-63)
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EM Identity and Description
| EM-63 | |
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Document Author
variable.detail.emDocumentAuthorHelp
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US EPA Office of Research and Development - National Exposure Research Laboratory |
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Document Year
variable.detail.emDocumentYearHelp
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2013 |
Variable General Info
12-digit hydrological unit code (HUC12) ?Comment:This field provides a unique 12-digit code for each subwatershed. National Watershed Boundary Dataset. 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release). |
Annual average of maximum daily temperature ?Comment:Data describing annual average maximum daily temperatures at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). The AET regression equation requires annual average daily temperature; we thus calculated annual average temperature as the mean value of the minimum and maximum temperature on a cell-by-cell basis using the Zonal Statistics tool in ArcMap 10.0 (ESRI, Inc. Redlands, CA). Average annual maximum daily temperature was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Annual average of minimum daily temperature ?Comment:Data describing annual average minimum at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). The AET regression equation requires annual average daily temperature; we thus calculated annual average temperature as the mean value of the minimum and maximum temperature on a cell-by-cell basis using the Zonal Statistics tool in ArcMap 10.0 (ESRI, Inc. Redlands, CA). Average annual minimum daily temperature was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Annual precipitation ?Comment:Data describing annual total precipitation at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). Annual precipitation was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Land use/land cover ?Comment:The National Land Cover Database (NLCD) for 2006 were acquired from the USGS at the scale of 30 x 30 m (http://www.mrlc.gov/nlcd06_data.php). |
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Variable ID
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10683 | 1188 | 1187 | 1189 | 1191 |
| HUC12 | Tmax | Tmin | PPT | LULC | |
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Qualitative-Quantitative
variable.detail.continuousCategoricalHelp
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Qualitative (Class, Rating or Ranking) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Qualitative (Class, Rating or Ranking) |
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Cardinal-Ordinal
variable.detail.cardinalOrdinalHelp
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Non-Ordinal | Cardinal | Cardinal | Cardinal | Non-Ordinal |
| Not applicable | °C | °C | cm/yr | Not applicable |
Variable Typology
12-digit hydrological unit code (HUC12) ?Comment:This field provides a unique 12-digit code for each subwatershed. National Watershed Boundary Dataset. 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release). |
Annual average of maximum daily temperature ?Comment:Data describing annual average maximum daily temperatures at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). The AET regression equation requires annual average daily temperature; we thus calculated annual average temperature as the mean value of the minimum and maximum temperature on a cell-by-cell basis using the Zonal Statistics tool in ArcMap 10.0 (ESRI, Inc. Redlands, CA). Average annual maximum daily temperature was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Annual average of minimum daily temperature ?Comment:Data describing annual average minimum at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). The AET regression equation requires annual average daily temperature; we thus calculated annual average temperature as the mean value of the minimum and maximum temperature on a cell-by-cell basis using the Zonal Statistics tool in ArcMap 10.0 (ESRI, Inc. Redlands, CA). Average annual minimum daily temperature was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Annual precipitation ?Comment:Data describing annual total precipitation at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). Annual precipitation was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Land use/land cover ?Comment:The National Land Cover Database (NLCD) for 2006 were acquired from the USGS at the scale of 30 x 30 m (http://www.mrlc.gov/nlcd06_data.php). |
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Predictor-Intermediate-Response
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Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
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Predictor Variable Type
variable.detail.displayPredictorVariableTypeHelp
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Time- or Space-varying Variable |
Time- or Space-varying Variable |
Time- or Space-varying Variable |
Time- or Space-varying Variable |
Time- or Space-varying Variable |
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Response Variable Type
variable.detail.resClassHelp
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Data Source/Type
variable.detail.dataTypeHelp
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Map or database (e.g., wide coverage, wide availability, measured or modeled) ?Comment:National Watershed Boundary Dataset. 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release). |
Map or database (e.g., wide coverage, wide availability, measured or modeled) ?Comment:PRISM climate dataset (http://prism.oregonstate.edu) |
Map or database (e.g., wide coverage, wide availability, measured or modeled) ?Comment:PRISM climate dataset (http://prism.oregonstate.edu) |
Map or database (e.g., wide coverage, wide availability, measured or modeled) ?Comment:PRISM climate dataset (http://prism.oregonstate.edu) |
Map or database (e.g., wide coverage, wide availability, measured or modeled) ?Comment:The USGS National Land Cover Database (NLCD) |
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Variable Classification Hierarchy
variable.detail.vchLevel1Help
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2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric |
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--Demarcation of watershed, channel, floodplain, shore, coastline, flowline |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Land use/land cover type or dominant habitat type |
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----Watershed demarcation or dimension |
----Physical/chemical characteristics of air, meteorology and precipitation |
----Physical/chemical characteristics of air, meteorology and precipitation |
----Physical/chemical characteristics of air, meteorology and precipitation |
----Other, multiple, unspecified or unclear |
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------Meteorology data and parameters (including precipitation) |
------Meteorology data and parameters (including precipitation) |
------Meteorology data and parameters (including precipitation) |
Variable Spatial Characteristics
12-digit hydrological unit code (HUC12) ?Comment:This field provides a unique 12-digit code for each subwatershed. National Watershed Boundary Dataset. 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release). |
Annual average of maximum daily temperature ?Comment:Data describing annual average maximum daily temperatures at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). The AET regression equation requires annual average daily temperature; we thus calculated annual average temperature as the mean value of the minimum and maximum temperature on a cell-by-cell basis using the Zonal Statistics tool in ArcMap 10.0 (ESRI, Inc. Redlands, CA). Average annual maximum daily temperature was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Annual average of minimum daily temperature ?Comment:Data describing annual average minimum at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). The AET regression equation requires annual average daily temperature; we thus calculated annual average temperature as the mean value of the minimum and maximum temperature on a cell-by-cell basis using the Zonal Statistics tool in ArcMap 10.0 (ESRI, Inc. Redlands, CA). Average annual minimum daily temperature was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Annual precipitation ?Comment:Data describing annual total precipitation at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). Annual precipitation was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Land use/land cover ?Comment:The National Land Cover Database (NLCD) for 2006 were acquired from the USGS at the scale of 30 x 30 m (http://www.mrlc.gov/nlcd06_data.php). |
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Spatial Extent Area
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>1,000,000 km^2 | >1,000,000 km^2 | >1,000,000 km^2 | >1,000,000 km^2 | >1,000,000 km^2 |
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Spatially Distributed?
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Yes | Yes | Yes | Yes | Yes |
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Observations Spatially Patterned?
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Yes | No | No | No | Yes |
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Spatial Grain Type
variable.detail.spGrainTypeHelp
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other (specify), for irregular (e.g., stream reach, lake basin) ?Comment:12 digit HUC. |
Not applicable | Not applicable | Not applicable | Area, for pixel or radial feature |
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Spatial Grain Size
variable.detail.spGrainSizeHelp
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irregular | Not applicable | Not applicable | Not applicable | 30m x 30m |
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Spatial Density
variable.detail.spDensityHelp
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Not applicable |
Not reported ?Comment:Individual 12-digit HUCs across the conterminous United States |
Not reported ?Comment:Individual 12-digit HUCs across the conterminous United States |
Not reported ?Comment:Individual 12-digit HUCs across the conterminous United States |
Not applicable ?Comment:Individual 12-digit HUCs across the conterminous United States |
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EnviroAtlas URL
variable.detail.enviroAtlasURLHelp
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The Watershed Boundary Dataset (WBD) | Average Annual Precipitation | Average Annual Precipitation | Average Annual Precipitation |
Variable Temporal Characteristics
12-digit hydrological unit code (HUC12) ?Comment:This field provides a unique 12-digit code for each subwatershed. National Watershed Boundary Dataset. 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release). |
Annual average of maximum daily temperature ?Comment:Data describing annual average maximum daily temperatures at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). The AET regression equation requires annual average daily temperature; we thus calculated annual average temperature as the mean value of the minimum and maximum temperature on a cell-by-cell basis using the Zonal Statistics tool in ArcMap 10.0 (ESRI, Inc. Redlands, CA). Average annual maximum daily temperature was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Annual average of minimum daily temperature ?Comment:Data describing annual average minimum at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). The AET regression equation requires annual average daily temperature; we thus calculated annual average temperature as the mean value of the minimum and maximum temperature on a cell-by-cell basis using the Zonal Statistics tool in ArcMap 10.0 (ESRI, Inc. Redlands, CA). Average annual minimum daily temperature was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Annual precipitation ?Comment:Data describing annual total precipitation at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). Annual precipitation was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Land use/land cover ?Comment:The National Land Cover Database (NLCD) for 2006 were acquired from the USGS at the scale of 30 x 30 m (http://www.mrlc.gov/nlcd06_data.php). |
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Temporal Extent
variable.detail.tempExtentHelp
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2010 | 2006 | 2006 | 2006 | 2006 |
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Temporally Distributed?
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Not applicable | No | No | No | No |
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Regular Temporal Grain?
variable.detail.regularTempGrainHelp
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Temporal Grain Size Value
variable.detail.tempGrainSizeValHelp
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Temporal Grain Size Units
variable.detail.tempGrainSizeUnitHelp
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Temporal Density
variable.detail.tempDensityHelp
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Variable Values
12-digit hydrological unit code (HUC12) ?Comment:This field provides a unique 12-digit code for each subwatershed. National Watershed Boundary Dataset. 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release). |
Annual average of maximum daily temperature ?Comment:Data describing annual average maximum daily temperatures at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). The AET regression equation requires annual average daily temperature; we thus calculated annual average temperature as the mean value of the minimum and maximum temperature on a cell-by-cell basis using the Zonal Statistics tool in ArcMap 10.0 (ESRI, Inc. Redlands, CA). Average annual maximum daily temperature was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Annual average of minimum daily temperature ?Comment:Data describing annual average minimum at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). The AET regression equation requires annual average daily temperature; we thus calculated annual average temperature as the mean value of the minimum and maximum temperature on a cell-by-cell basis using the Zonal Statistics tool in ArcMap 10.0 (ESRI, Inc. Redlands, CA). Average annual minimum daily temperature was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Annual precipitation ?Comment:Data describing annual total precipitation at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). Annual precipitation was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Land use/land cover ?Comment:The National Land Cover Database (NLCD) for 2006 were acquired from the USGS at the scale of 30 x 30 m (http://www.mrlc.gov/nlcd06_data.php). |
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| Not applicable | °C | °C | cm/yr | Not applicable | |
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Min Value
variable.detail.minEstHelp
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Not applicable | Not reported | Not reported | Not reported | Not applicable |
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Max Value
variable.detail.estHelp
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Not applicable | Not reported | Not reported | Not reported | Not applicable |
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Other Value Type
variable.detail.natureOtherEstHelp
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Other Value
variable.detail.otherEstHelp
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Variable Variability and Sensitivity
12-digit hydrological unit code (HUC12) ?Comment:This field provides a unique 12-digit code for each subwatershed. National Watershed Boundary Dataset. 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release). |
Annual average of maximum daily temperature ?Comment:Data describing annual average maximum daily temperatures at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). The AET regression equation requires annual average daily temperature; we thus calculated annual average temperature as the mean value of the minimum and maximum temperature on a cell-by-cell basis using the Zonal Statistics tool in ArcMap 10.0 (ESRI, Inc. Redlands, CA). Average annual maximum daily temperature was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Annual average of minimum daily temperature ?Comment:Data describing annual average minimum at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). The AET regression equation requires annual average daily temperature; we thus calculated annual average temperature as the mean value of the minimum and maximum temperature on a cell-by-cell basis using the Zonal Statistics tool in ArcMap 10.0 (ESRI, Inc. Redlands, CA). Average annual minimum daily temperature was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Annual precipitation ?Comment:Data describing annual total precipitation at the 2.5 arcmin (~4 km) scale for 2006 were acquired from the PRISM climate dataset (http://prism.oregonstate.edu). Annual precipitation was then calculated for individual 12-digit USGS Hydrologic Unit Codes (HUC12s; http://water.usgs.gov/GIS/huc.html; 22 March 2011 release) using the Zonal Statistics tool in ArcMap 10.0. |
Land use/land cover ?Comment:The National Land Cover Database (NLCD) for 2006 were acquired from the USGS at the scale of 30 x 30 m (http://www.mrlc.gov/nlcd06_data.php). |
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Variability Expression Given?
variable.detail.variabilityExpHelp
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Not applicable | No | No | No | No |
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Variability Metric
variable.detail.variabilityMetricHelp
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None | None | None | None | None |
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Variability Value
variable.detail.variabilityValueHelp
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None | None | None | None | None |
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Variability Units
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None | None | None | None | None |
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Resampling Used?
variable.detail.bootstrappingHelp
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Variability Expression Used in Modeling?
variable.detail.variabilityUsedHelp
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Variable Operational Validation (Response Variables only)
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Variable ID
variable.detail.varIdHelp
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Validated?
variable.detail.resValidatedHelp
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Validation Approach (within, between, etc.)
variable.detail.validationApproachHelp
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Validation Quality (Qual/Quant)
variable.detail.validationQualityHelp
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Validation Method (Stat/Deviance)
variable.detail.validationMethodHelp
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Validation Metric
variable.detail.validationMetricHelp
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Validation Value
variable.detail.validationValHelp
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Validation Units
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Use of Measured Response Data
variable.detail.measuredResponseDataHelp
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