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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
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. |
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Variable ID
variable.detail.varIdHelp
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1187 |
| Tmin | |
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Qualitative-Quantitative
variable.detail.continuousCategoricalHelp
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Quantitative (Cardinal Only) |
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Cardinal-Ordinal
variable.detail.cardinalOrdinalHelp
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Cardinal |
| °C |
Variable Typology
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. |
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Predictor-Intermediate-Response
variable.detail.displayVariableTypeHelp
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Predictor |
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Predictor Variable Type
variable.detail.displayPredictorVariableTypeHelp
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Time- or Space-varying Variable |
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Response Variable Type
variable.detail.resClassHelp
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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:PRISM climate dataset (http://prism.oregonstate.edu) |
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Variable Classification Hierarchy
variable.detail.vchLevel1Help
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5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
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--Physical/chemical characteristics of nonliving ecosystem components |
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----Physical/chemical characteristics of air, meteorology and precipitation |
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------Meteorology data and parameters (including precipitation) |
Variable Spatial Characteristics
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. |
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Spatial Extent Area
variable.detail.spExtentHelp
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>1,000,000 km^2 |
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Spatially Distributed?
variable.detail.spDistributedHelp
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Yes |
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Observations Spatially Patterned?
variable.detail.regularSpGrainHelp
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No |
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Spatial Grain Type
variable.detail.spGrainTypeHelp
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Not applicable |
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Spatial Grain Size
variable.detail.spGrainSizeHelp
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Not applicable |
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Spatial Density
variable.detail.spDensityHelp
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Not reported ?Comment:Individual 12-digit HUCs across the conterminous United States |
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EnviroAtlas URL
variable.detail.enviroAtlasURLHelp
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Average Annual Precipitation |
Variable Temporal Characteristics
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. |
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Temporal Extent
variable.detail.tempExtentHelp
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2006 |
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Temporally Distributed?
variable.detail.tempDistributedHelp
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No |
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Regular Temporal Grain?
variable.detail.regularTempGrainHelp
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Not applicable |
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Temporal Grain Size Value
variable.detail.tempGrainSizeValHelp
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Not applicable |
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Temporal Grain Size Units
variable.detail.tempGrainSizeUnitHelp
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Not applicable |
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Temporal Density
variable.detail.tempDensityHelp
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Not applicable |
Variable Values
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. |
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| °C | |
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Min Value
variable.detail.minEstHelp
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Not reported |
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Max Value
variable.detail.estHelp
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Not reported |
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Other Value Type
variable.detail.natureOtherEstHelp
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Not applicable |
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Other Value
variable.detail.otherEstHelp
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Not applicable |
Variable Variability and Sensitivity
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. |
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Variability Expression Given?
variable.detail.variabilityExpHelp
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No |
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Variability Metric
variable.detail.variabilityMetricHelp
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None |
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Variability Value
variable.detail.variabilityValueHelp
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None |
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Variability Units
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None |
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Resampling Used?
variable.detail.bootstrappingHelp
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Not applicable |
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Variability Expression Used in Modeling?
variable.detail.variabilityUsedHelp
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Not applicable |
Variable Operational Validation (Response Variables only)
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Variable ID
variable.detail.varIdHelp
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Validated?
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Validation Approach (within, between, etc.)
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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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