EcoService Models Library (ESML)

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Variables Details

: (EM-492)

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EM Identity and Description

EM ID variable.detail.emIdHelp ?	EM-492
Document Author variable.detail.emDocumentAuthorHelp ?	US EPA Office of Research and Development - National Exposure Research Laboratory
Document Year variable.detail.emDocumentYearHelp ?	2013

Variable General Info

Name variable.detail.varNameHelp ?	12-digit hydrological unit code (HUC12)	Land use/land cover ? Comment: 2006 National Land Cover Data (NLCD).	National elevation data	Soil class ? Comment: Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database.	Soil survey polygon ? Comment: Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database.	Potentially suitable land (y/n) ? Comment: This variable is determined by the class variable Land use/land cover. National Land Cover Data (NLCD) classes "pasture/hay" and "cultivated crops" were re-classified as potentially suitable and all other landcover classes as unsuitable.	Composite topographic index ? Comment: A Composite Topographic Index (CTI) or wetness index was developed to identify areas wet enough to create wetlands. The wetness index grid, calculated from National Elevation Data, relates upstream contributing area and slope to overland flow. Results from previous studies suggested that CTI values >550 captured the majority of wetlands.	Percent poorly drained soil classes (per survey polygon) ? Comment: Poorly- and very poorly dreained soils were identified using Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database. The two poorly drained soil classes, expressed as percentage of a polygon in the soil survey were combined.	Percent potentially restorable wetlands (per HUC12) ? Comment: by HUC12.
Variable ID variable.detail.varIdHelp ?	10690	10685	10694	10693	10698	10692	10696	10695	10697
Symbol variable.detail.varSymbolHelp ?	HUC	LULC	Not reported	Not reported	Not reported	Not reported	CTI	Not reported	Not reported
Qualitative-Quantitative variable.detail.continuousCategoricalHelp ?	Qualitative (Class, Rating or Ranking)	Qualitative (Class, Rating or Ranking)	Quantitative (Cardinal Only)	Qualitative (Class, Rating or Ranking)	Qualitative (Class, Rating or Ranking)	Qualitative (Class, Rating or Ranking)	Quantitative (Cardinal Only)	Quantitative (Cardinal Only)	Quantitative (Cardinal Only)
Cardinal-Ordinal variable.detail.cardinalOrdinalHelp ?	Non-Ordinal	Non-Ordinal	Cardinal	Non-Ordinal	Non-Ordinal	Non-Ordinal	Cardinal	Cardinal	Cardinal
Units variable.detail.varUnitsHelp ?	Not applicable	Not applicable	Not reported	Not applicable	Not applicable	Not applicable	unitless	%	%

Variable Typology

Name variable.detail.varNameHelp ?	12-digit hydrological unit code (HUC12)	Land use/land cover ? Comment: 2006 National Land Cover Data (NLCD).	National elevation data	Soil class ? Comment: Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database.	Soil survey polygon ? Comment: Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database.	Potentially suitable land (y/n) ? Comment: This variable is determined by the class variable Land use/land cover. National Land Cover Data (NLCD) classes "pasture/hay" and "cultivated crops" were re-classified as potentially suitable and all other landcover classes as unsuitable.	Composite topographic index ? Comment: A Composite Topographic Index (CTI) or wetness index was developed to identify areas wet enough to create wetlands. The wetness index grid, calculated from National Elevation Data, relates upstream contributing area and slope to overland flow. Results from previous studies suggested that CTI values >550 captured the majority of wetlands.	Percent poorly drained soil classes (per survey polygon) ? Comment: Poorly- and very poorly dreained soils were identified using Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database. The two poorly drained soil classes, expressed as percentage of a polygon in the soil survey were combined.	Percent potentially restorable wetlands (per HUC12) ? Comment: by HUC12.
Predictor-Intermediate-Response variable.detail.displayVariableTypeHelp ?	Predictor	Predictor	Predictor	Predictor	Predictor	Predictor	Intermediate (Computed) Variable	Intermediate (Computed) Variable	Response
Predictor Variable Type variable.detail.displayPredictorVariableTypeHelp ?	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	Constant or Parameter	Not applicable	Not applicable	Not applicable
Response Variable Type variable.detail.resClassHelp ?	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Computed Variable
Data Source/Type variable.detail.dataTypeHelp ?	Map or database (e.g., wide coverage, wide availability, measured or modeled)	Map or database (e.g., wide coverage, wide availability, measured or modeled) ? Comment: 2006 National Land Cover Data (NLCD).	Map or database (e.g., wide coverage, wide availability, measured or modeled)	Map or database (e.g., wide coverage, wide availability, measured or modeled) ? Comment: Soil Survey Geographic (SSURGO) Database.	Map or database (e.g., wide coverage, wide availability, measured or modeled)	Map or database (e.g., wide coverage, wide availability, measured or modeled) ? Comment: National Land Cover Data (NLCD).	Not applicable	Not applicable	Not applicable
Variable Classification Hierarchy variable.detail.vchLevel1Help ?	2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric	2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric	2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric	2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric	N. Not classified	2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric	2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric	5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services	None
	--Demarcation of watershed, channel, floodplain, shore, coastline, flowline	--Land use/land cover type or dominant habitat type	--Geographic position, horizontal or vertical	--Dominant soil or substrate type		--Land use/land cover type or dominant habitat type	--Geographic position, horizontal or vertical	--Physical/chemical characteristics of nonliving ecosystem components
	----Watershed demarcation or dimension	----Other, multiple, unspecified or unclear	----Elevation, altitude, bathymetry			----Agroecosystems	----Slope, roughness, ruggedness	----Physical/chemical characteristics of soils, substrates, rocks
						------Other, multiple, unspecified or unclear		------Soil hydrologic characteristics

Variable Spatial Characteristics

Name variable.detail.varNameHelp ?	12-digit hydrological unit code (HUC12)	Land use/land cover ? Comment: 2006 National Land Cover Data (NLCD).	National elevation data	Soil class ? Comment: Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database.	Soil survey polygon ? Comment: Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database.	Potentially suitable land (y/n) ? Comment: This variable is determined by the class variable Land use/land cover. National Land Cover Data (NLCD) classes "pasture/hay" and "cultivated crops" were re-classified as potentially suitable and all other landcover classes as unsuitable.	Composite topographic index ? Comment: A Composite Topographic Index (CTI) or wetness index was developed to identify areas wet enough to create wetlands. The wetness index grid, calculated from National Elevation Data, relates upstream contributing area and slope to overland flow. Results from previous studies suggested that CTI values >550 captured the majority of wetlands.	Percent poorly drained soil classes (per survey polygon) ? Comment: Poorly- and very poorly dreained soils were identified using Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database. The two poorly drained soil classes, expressed as percentage of a polygon in the soil survey were combined.	Percent potentially restorable wetlands (per HUC12) ? Comment: by HUC12.
Spatial Extent Area variable.detail.spExtentHelp ?	>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	Not recorded for Constant or Factor Variables	>1,000,000 km^2	>1,000,000 km^2	>1,000,000 km^2
Spatially Distributed? variable.detail.spDistributedHelp ?	Yes	Yes	Yes	Yes	Yes	Not recorded for Constant or Factor Variables	Yes	Yes	Yes
Observations Spatially Patterned? variable.detail.regularSpGrainHelp ?	Yes	Yes	Yes	Yes	Yes	Not recorded for Constant or Factor Variables	Yes	Yes	Yes
Spatial Grain Type variable.detail.spGrainTypeHelp ?	other (specify), for irregular (e.g., stream reach, lake basin) ? Comment: 12 digit HUC.	Area, for pixel or radial feature	Map scale, for cartographic feature	other (specify), for irregular (e.g., stream reach, lake basin)	other (specify), for irregular (e.g., stream reach, lake basin)	Not recorded for Constant or Factor Variables	other (specify), for irregular (e.g., stream reach, lake basin)	other (specify), for irregular (e.g., stream reach, lake basin)	other (specify), for irregular (e.g., stream reach, lake basin) ? Comment: by HUC12.
Spatial Grain Size variable.detail.spGrainSizeHelp ?	irregular	30m x 30m	irregular	irregular	irregular	Not recorded for Constant or Factor Variables	irregular	irregular	irregular
Spatial Density variable.detail.spDensityHelp ?	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable	Not applicable
EnviroAtlas URL variable.detail.enviroAtlasURLHelp ?	The Watershed Boundary Dataset (WBD)					GAP Ecological Systems

Variable Temporal Characteristics

Name variable.detail.varNameHelp ?	12-digit hydrological unit code (HUC12)	Land use/land cover ? Comment: 2006 National Land Cover Data (NLCD).	National elevation data	Soil class ? Comment: Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database.	Soil survey polygon ? Comment: Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database.	Potentially suitable land (y/n) ? Comment: This variable is determined by the class variable Land use/land cover. National Land Cover Data (NLCD) classes "pasture/hay" and "cultivated crops" were re-classified as potentially suitable and all other landcover classes as unsuitable.	Composite topographic index ? Comment: A Composite Topographic Index (CTI) or wetness index was developed to identify areas wet enough to create wetlands. The wetness index grid, calculated from National Elevation Data, relates upstream contributing area and slope to overland flow. Results from previous studies suggested that CTI values >550 captured the majority of wetlands.	Percent poorly drained soil classes (per survey polygon) ? Comment: Poorly- and very poorly dreained soils were identified using Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database. The two poorly drained soil classes, expressed as percentage of a polygon in the soil survey were combined.	Percent potentially restorable wetlands (per HUC12) ? Comment: by HUC12.
Temporal Extent variable.detail.tempExtentHelp ?	2011	2006	Not reported	2009	2009	Not recorded for Constant or Factor Variables	Not reported	2009	2006-2013
Temporally Distributed? variable.detail.tempDistributedHelp ?	Not applicable	No	No	No	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable	Not applicable
Regular Temporal Grain? variable.detail.regularTempGrainHelp ?	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable	Not applicable
Temporal Grain Size Value variable.detail.tempGrainSizeValHelp ?	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable	Not applicable
Temporal Grain Size Units variable.detail.tempGrainSizeUnitHelp ?	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable	Not applicable
Temporal Density variable.detail.tempDensityHelp ?	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable	Not applicable

Variable Values

Name variable.detail.varNameHelp ?	12-digit hydrological unit code (HUC12)	Land use/land cover ? Comment: 2006 National Land Cover Data (NLCD).	National elevation data	Soil class ? Comment: Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database.	Soil survey polygon ? Comment: Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database.	Potentially suitable land (y/n) ? Comment: This variable is determined by the class variable Land use/land cover. National Land Cover Data (NLCD) classes "pasture/hay" and "cultivated crops" were re-classified as potentially suitable and all other landcover classes as unsuitable.	Composite topographic index ? Comment: A Composite Topographic Index (CTI) or wetness index was developed to identify areas wet enough to create wetlands. The wetness index grid, calculated from National Elevation Data, relates upstream contributing area and slope to overland flow. Results from previous studies suggested that CTI values >550 captured the majority of wetlands.	Percent poorly drained soil classes (per survey polygon) ? Comment: Poorly- and very poorly dreained soils were identified using Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database. The two poorly drained soil classes, expressed as percentage of a polygon in the soil survey were combined.	Percent potentially restorable wetlands (per HUC12) ? Comment: by HUC12.
Units variable.detail.estUnitHelp ?	Not applicable	Not applicable	Not reported	Not applicable	Not applicable	Not applicable	Not reported	Not reported	% ? Comment: by HUC12
Min Value variable.detail.minEstHelp ?	Not applicable	Not applicable	Not reported	Not applicable	Not applicable	Not applicable	Not reported	Not reported	0
Max Value variable.detail.estHelp ?	Not applicable	Not applicable	Not reported	Not applicable	Not applicable	Not applicable	Not reported	Not reported	100
Other Value Type variable.detail.natureOtherEstHelp ?	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable
Other Value variable.detail.otherEstHelp ?	Not applicable	Not applicable	Not reported	Not applicable	Not applicable	Not applicable	Not reported	Not reported	Not reported

Variable Variability and Sensitivity

Name variable.detail.varNameHelp ?	12-digit hydrological unit code (HUC12)	Land use/land cover ? Comment: 2006 National Land Cover Data (NLCD).	National elevation data	Soil class ? Comment: Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database.	Soil survey polygon ? Comment: Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database.	Potentially suitable land (y/n) ? Comment: This variable is determined by the class variable Land use/land cover. National Land Cover Data (NLCD) classes "pasture/hay" and "cultivated crops" were re-classified as potentially suitable and all other landcover classes as unsuitable.	Composite topographic index ? Comment: A Composite Topographic Index (CTI) or wetness index was developed to identify areas wet enough to create wetlands. The wetness index grid, calculated from National Elevation Data, relates upstream contributing area and slope to overland flow. Results from previous studies suggested that CTI values >550 captured the majority of wetlands.	Percent poorly drained soil classes (per survey polygon) ? Comment: Poorly- and very poorly dreained soils were identified using Natural Resources Conservation Service (NRCS) Soil Survey information mainly from the higher resolution Soil Survey Geographic (SSURGO) Database. The two poorly drained soil classes, expressed as percentage of a polygon in the soil survey were combined.	Percent potentially restorable wetlands (per HUC12) ? Comment: by HUC12.
Variability Expression Given? variable.detail.variabilityExpHelp ?	Not applicable	No	No	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	No	No	No
Variability Metric variable.detail.variabilityMetricHelp ?	None	None	None	None	None	None	None	None	None
Variability Value variable.detail.variabilityValueHelp ?	None	None	None	None	None	None	None	None	None
Variability Units	None	None	None	None	None	None	None	None	None
Resampling Used? variable.detail.bootstrappingHelp ?	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable	Not applicable
Variability Expression Used in Modeling? variable.detail.variabilityUsedHelp ?	Not applicable	Not applicable	Not applicable	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable	Not applicable

Variable Operational Validation (Response Variables only)

Name variable.detail.varNameHelp ?	Percent potentially restorable wetlands (per HUC12)
Variable ID variable.detail.varIdHelp ?	10697
Validated? variable.detail.resValidatedHelp ?	Not applicable
Validation Approach (within, between, etc.) variable.detail.validationApproachHelp ?	None
Validation Quality (Qual/Quant) variable.detail.validationQualityHelp ?	None
Validation Method (Stat/Deviance) variable.detail.validationMethodHelp ?	None
Validation Metric variable.detail.validationMetricHelp ?	None
Validation Value variable.detail.validationValHelp ?	None
Validation Units	None
Use of Measured Response Data variable.detail.measuredResponseDataHelp ?	None