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Variables Details
: (EM-492)
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EM Identity and Description
| EM-492 | |
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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
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. |
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Variable ID
variable.detail.varIdHelp
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10696 | 10695 |
| CTI | Not reported | |
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Qualitative-Quantitative
variable.detail.continuousCategoricalHelp
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Quantitative (Cardinal Only) | Quantitative (Cardinal Only) |
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Cardinal-Ordinal
variable.detail.cardinalOrdinalHelp
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Cardinal | Cardinal |
| unitless | % |
Variable Typology
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. |
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Predictor-Intermediate-Response
variable.detail.displayVariableTypeHelp
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Intermediate (Computed) Variable |
Intermediate (Computed) Variable |
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Predictor Variable Type
variable.detail.displayPredictorVariableTypeHelp
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Not applicable | Not applicable |
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Response Variable Type
variable.detail.resClassHelp
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Not applicable | Not applicable |
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Data Source/Type
variable.detail.dataTypeHelp
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Not applicable | Not applicable |
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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 |
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--Geographic position, horizontal or vertical |
--Physical/chemical characteristics of nonliving ecosystem components |
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----Slope, roughness, ruggedness |
----Physical/chemical characteristics of soils, substrates, rocks |
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------Soil hydrologic characteristics |
Variable Spatial Characteristics
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. |
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Spatial Extent Area
variable.detail.spExtentHelp
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>1,000,000 km^2 | >1,000,000 km^2 |
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Spatially Distributed?
variable.detail.spDistributedHelp
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Yes | Yes |
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Observations Spatially Patterned?
variable.detail.regularSpGrainHelp
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Yes | 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) | other (specify), for irregular (e.g., stream reach, lake basin) |
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Spatial Grain Size
variable.detail.spGrainSizeHelp
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irregular | irregular |
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Spatial Density
variable.detail.spDensityHelp
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Not applicable | Not applicable |
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EnviroAtlas URL
variable.detail.enviroAtlasURLHelp
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Variable Temporal Characteristics
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. |
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Temporal Extent
variable.detail.tempExtentHelp
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Not reported | 2009 |
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Temporally Distributed?
variable.detail.tempDistributedHelp
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Not applicable | Not applicable |
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Regular Temporal Grain?
variable.detail.regularTempGrainHelp
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Not applicable | Not applicable |
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Temporal Grain Size Value
variable.detail.tempGrainSizeValHelp
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Not applicable | Not applicable |
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Temporal Grain Size Units
variable.detail.tempGrainSizeUnitHelp
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Not applicable | Not applicable |
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Temporal Density
variable.detail.tempDensityHelp
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Not applicable | Not applicable |
Variable Values
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. |
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| Not reported | Not reported | |
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Min Value
variable.detail.minEstHelp
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Not reported | Not reported |
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Max Value
variable.detail.estHelp
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Not reported | Not reported |
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Other Value Type
variable.detail.natureOtherEstHelp
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Not applicable | Not applicable |
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Other Value
variable.detail.otherEstHelp
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Not reported | Not reported |
Variable Variability and Sensitivity
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. |
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Variability Expression Given?
variable.detail.variabilityExpHelp
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No | No |
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Variability Metric
variable.detail.variabilityMetricHelp
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None | None |
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Variability Value
variable.detail.variabilityValueHelp
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None | None |
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Variability Units
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None | None |
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Resampling Used?
variable.detail.bootstrappingHelp
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Not applicable | Not applicable |
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Variability Expression Used in Modeling?
variable.detail.variabilityUsedHelp
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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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