EcoService Models Library (ESML)

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Variables Details

: (EM-493)

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EM Identity and Description

EM ID variable.detail.emIdHelp ?	EM-493
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 ?	Census block group ? Comment: 2010 census.	Tree cover ? Comment: Tree cover determined from remotely sensed, high resolution land cover map developed by EPA.	Annual carbon sequestration rate ? Comment: The USDA Forest Service i-Tree model was used to estimate the annual carbon sequestration rate from state-based rates. Citation: Nowak, D.J., E.J. Greenfield, R.E. Hoehn, and E. LaPoint. 2013. Carbon storage and sequestration by trees in urban and community areas of the United States. Environmental Pollution 178: 229-236.	Tree cover (per census block group) ? Comment: Derived from the land cover map developed by EPA.	Carbon sequestered (per census block group)
Variable ID variable.detail.varIdHelp ?	10700	10702	10703	10701	10704
Symbol variable.detail.varSymbolHelp ?	Not reported	Not reported	Not reported	Not reported	Not reported
Qualitative-Quantitative variable.detail.continuousCategoricalHelp ?	Qualitative (Class, Rating or Ranking)	Quantitative (Cardinal Only)	Quantitative (Cardinal Only)	Quantitative (Cardinal Only)	Quantitative (Cardinal Only)
Cardinal-Ordinal variable.detail.cardinalOrdinalHelp ?	Non-Ordinal	Cardinal	Cardinal	Cardinal	Cardinal
Units variable.detail.varUnitsHelp ?	Not applicable	m^2	kg C m^-2 tree cover yr^-1	m^2	mt C yr^-1

Variable Typology

Name variable.detail.varNameHelp ?	Census block group ? Comment: 2010 census.	Tree cover ? Comment: Tree cover determined from remotely sensed, high resolution land cover map developed by EPA.	Annual carbon sequestration rate ? Comment: The USDA Forest Service i-Tree model was used to estimate the annual carbon sequestration rate from state-based rates. Citation: Nowak, D.J., E.J. Greenfield, R.E. Hoehn, and E. LaPoint. 2013. Carbon storage and sequestration by trees in urban and community areas of the United States. Environmental Pollution 178: 229-236.	Tree cover (per census block group) ? Comment: Derived from the land cover map developed by EPA.	Carbon sequestered (per census block group)
Predictor-Intermediate-Response variable.detail.displayVariableTypeHelp ?	Predictor	Predictor	Predictor	Intermediate (Computed) Variable	Response
Predictor Variable Type variable.detail.displayPredictorVariableTypeHelp ?	Time- or Space-varying Variable	Time- or Space-varying Variable	Constant or Parameter	Not applicable	Not applicable
Response Variable Type variable.detail.resClassHelp ?	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)	Derived as output of another model (and not found in a widely available database)	Not applicable	Not applicable
Variable Classification Hierarchy variable.detail.vchLevel1Help ?	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	5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services
	--Political boundary	--Biological characteristics, processes or requirements of living ecosystem components	--Chemical (C, N, P, sediment/particulate) characteristics of ecosystem components	--Biological characteristics, processes or requirements of living ecosystem components	--Chemical (C, N, P, sediment/particulate) characteristics of ecosystem components
		----Biological characteristics, processes or requirements of flora and fungi	----Carbon-related characteristics of ecosystem components	----Biological characteristics, processes or requirements of flora and fungi	----Carbon-related characteristics of ecosystem components
		------Cover characteristics (canopy cover, herbaceous cover or leaf area)	------Carbon accumulation by terrestrial or aquatic ecosystem components	------Cover characteristics (canopy cover, herbaceous cover or leaf area)	------Carbon accumulation by terrestrial or aquatic ecosystem components

Variable Spatial Characteristics

Name variable.detail.varNameHelp ?	Census block group ? Comment: 2010 census.	Tree cover ? Comment: Tree cover determined from remotely sensed, high resolution land cover map developed by EPA.	Annual carbon sequestration rate ? Comment: The USDA Forest Service i-Tree model was used to estimate the annual carbon sequestration rate from state-based rates. Citation: Nowak, D.J., E.J. Greenfield, R.E. Hoehn, and E. LaPoint. 2013. Carbon storage and sequestration by trees in urban and community areas of the United States. Environmental Pollution 178: 229-236.	Tree cover (per census block group) ? Comment: Derived from the land cover map developed by EPA.	Carbon sequestered (per census block group)
Spatial Extent Area variable.detail.spExtentHelp ?	100-1000 km^2	100-1000 km^2	Not recorded for Constant or Factor Variables	100-1000 km^2	100-1000 km^2
Spatially Distributed? variable.detail.spDistributedHelp ?	Yes	Yes	Not recorded for Constant or Factor Variables	Yes	Yes
Observations Spatially Patterned? variable.detail.regularSpGrainHelp ?	Yes	Yes	Not recorded for Constant or Factor Variables	Yes	Yes
Spatial Grain Type variable.detail.spGrainTypeHelp ?	other (specify), for irregular (e.g., stream reach, lake basin) ? Comment: Census blocks	Not reported	Not recorded for Constant or Factor Variables	other (specify), for irregular (e.g., stream reach, lake basin) ? Comment: By census block group.	other (specify), for irregular (e.g., stream reach, lake basin)
Spatial Grain Size variable.detail.spGrainSizeHelp ?	irregular	Not reported	Not recorded for Constant or Factor Variables	irregular	irregular
Spatial Density variable.detail.spDensityHelp ?	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable
EnviroAtlas URL variable.detail.enviroAtlasURLHelp ?			Carbon Storage by Tree Biomass

Variable Temporal Characteristics

Name variable.detail.varNameHelp ?	Census block group ? Comment: 2010 census.	Tree cover ? Comment: Tree cover determined from remotely sensed, high resolution land cover map developed by EPA.	Annual carbon sequestration rate ? Comment: The USDA Forest Service i-Tree model was used to estimate the annual carbon sequestration rate from state-based rates. Citation: Nowak, D.J., E.J. Greenfield, R.E. Hoehn, and E. LaPoint. 2013. Carbon storage and sequestration by trees in urban and community areas of the United States. Environmental Pollution 178: 229-236.	Tree cover (per census block group) ? Comment: Derived from the land cover map developed by EPA.	Carbon sequestered (per census block group)
Temporal Extent variable.detail.tempExtentHelp ?	2010	Not reported	Not recorded for Constant or Factor Variables	Not reported	2010-2013
Temporally Distributed? variable.detail.tempDistributedHelp ?	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable
Regular Temporal Grain? variable.detail.regularTempGrainHelp ?	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable
Temporal Grain Size Value variable.detail.tempGrainSizeValHelp ?	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable
Temporal Grain Size Units variable.detail.tempGrainSizeUnitHelp ?	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable
Temporal Density variable.detail.tempDensityHelp ?	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable

Variable Values

Name variable.detail.varNameHelp ?	Census block group ? Comment: 2010 census.	Tree cover ? Comment: Tree cover determined from remotely sensed, high resolution land cover map developed by EPA.	Annual carbon sequestration rate ? Comment: The USDA Forest Service i-Tree model was used to estimate the annual carbon sequestration rate from state-based rates. Citation: Nowak, D.J., E.J. Greenfield, R.E. Hoehn, and E. LaPoint. 2013. Carbon storage and sequestration by trees in urban and community areas of the United States. Environmental Pollution 178: 229-236.	Tree cover (per census block group) ? Comment: Derived from the land cover map developed by EPA.	Carbon sequestered (per census block group)
Units variable.detail.estUnitHelp ?	Not applicable	Not reported	Not applicable ? Comment: The national average rate of 0.306 kg C/m^2 of tree cover/yr was used by EnviroAtlas in the computation of this model. The state rates ranged from 0.168 to 0.581 kg C/m^2 of tree cover/yr.	Not reported	mt^yr-1 ? Comment: EnviroAtlas mapped units converted from kg C to mt C (metric tons).
Min Value variable.detail.minEstHelp ?	Not applicable	Not reported	Not applicable	Not reported	12
Max Value variable.detail.estHelp ?	Not applicable	Not reported	Not applicable	Not reported	5,403
Other Value Type variable.detail.natureOtherEstHelp ?	Not applicable	Not applicable	Mean	Not applicable	Not applicable
Other Value variable.detail.otherEstHelp ?	Not applicable	Not reported	0.306	Not reported	Not reported

Variable Variability and Sensitivity

Name variable.detail.varNameHelp ?	Census block group ? Comment: 2010 census.	Tree cover ? Comment: Tree cover determined from remotely sensed, high resolution land cover map developed by EPA.	Annual carbon sequestration rate ? Comment: The USDA Forest Service i-Tree model was used to estimate the annual carbon sequestration rate from state-based rates. Citation: Nowak, D.J., E.J. Greenfield, R.E. Hoehn, and E. LaPoint. 2013. Carbon storage and sequestration by trees in urban and community areas of the United States. Environmental Pollution 178: 229-236.	Tree cover (per census block group) ? Comment: Derived from the land cover map developed by EPA.	Carbon sequestered (per census block group)
Variability Expression Given? variable.detail.variabilityExpHelp ?	Not applicable	No	Not recorded for Constant or Factor Variables	No	No
Variability Metric variable.detail.variabilityMetricHelp ?	None	None	None	None	None
Variability Value variable.detail.variabilityValueHelp ?	None	None	None	None	None
Variability Units	None	None	None	None	None
Resampling Used? variable.detail.bootstrappingHelp ?	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable
Variability Expression Used in Modeling? variable.detail.variabilityUsedHelp ?	Not applicable	Not applicable	Not recorded for Constant or Factor Variables	Not applicable	Not applicable

Variable Operational Validation (Response Variables only)

Name variable.detail.varNameHelp ?	Carbon sequestered (per census block group)
Variable ID variable.detail.varIdHelp ?	10704
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