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Variables Details
: (EM-653)
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EM Identity and Description
| EM-653 | |
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Document Author
variable.detail.emDocumentAuthorHelp
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Cordell H. K., V. Heboyan, F. Santos, J. C. Bergstrom |
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Document Year
variable.detail.emDocumentYearHelp
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2011 |
Variable General Info
Percent forest land ?Comment:Forest land is a land cover/use category that is at least 10 percent stocked by single-stemmed woody species of any size that will be at least 4 meters (13 feet) tall at maturity. Also included is land bearing evidence of natural regeneration of tree cover (cut over forest or abandoned farmland) and not currently developed for no forest use. Ten percent stocked, when viewed from a vertical direction, equates to an aerial canopy cover of leaves and branches of 25 percent or greater. The minimum area for classification as forest land is 1 acre, and the area must be at least 100 feet wide. The model also includes a percent forest land squared term and its coefficient. |
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Variable ID
variable.detail.varIdHelp
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15255 |
| pforest | |
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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 |
| % |
Variable Typology
Percent forest land ?Comment:Forest land is a land cover/use category that is at least 10 percent stocked by single-stemmed woody species of any size that will be at least 4 meters (13 feet) tall at maturity. Also included is land bearing evidence of natural regeneration of tree cover (cut over forest or abandoned farmland) and not currently developed for no forest use. Ten percent stocked, when viewed from a vertical direction, equates to an aerial canopy cover of leaves and branches of 25 percent or greater. The minimum area for classification as forest land is 1 acre, and the area must be at least 100 feet wide. The model also includes a percent forest land squared term and its coefficient. |
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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) |
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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 |
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--Land use/land cover type or dominant habitat type |
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----Forests |
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Variable Spatial Characteristics
Percent forest land ?Comment:Forest land is a land cover/use category that is at least 10 percent stocked by single-stemmed woody species of any size that will be at least 4 meters (13 feet) tall at maturity. Also included is land bearing evidence of natural regeneration of tree cover (cut over forest or abandoned farmland) and not currently developed for no forest use. Ten percent stocked, when viewed from a vertical direction, equates to an aerial canopy cover of leaves and branches of 25 percent or greater. The minimum area for classification as forest land is 1 acre, and the area must be at least 100 feet wide. The model also includes a percent forest land squared term and its coefficient. |
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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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Yes |
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Spatial Grain Type
variable.detail.spGrainTypeHelp
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map scale, for cartographic feature |
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Spatial Grain Size
variable.detail.spGrainSizeHelp
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varies |
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Spatial Density
variable.detail.spDensityHelp
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Not applicable |
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EnviroAtlas URL
variable.detail.enviroAtlasURLHelp
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GAP Ecological Systems |
Variable Temporal Characteristics
Percent forest land ?Comment:Forest land is a land cover/use category that is at least 10 percent stocked by single-stemmed woody species of any size that will be at least 4 meters (13 feet) tall at maturity. Also included is land bearing evidence of natural regeneration of tree cover (cut over forest or abandoned farmland) and not currently developed for no forest use. Ten percent stocked, when viewed from a vertical direction, equates to an aerial canopy cover of leaves and branches of 25 percent or greater. The minimum area for classification as forest land is 1 acre, and the area must be at least 100 feet wide. The model also includes a percent forest land squared term and its coefficient. |
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Temporal Extent
variable.detail.tempExtentHelp
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1982, 1987, 1992, 1997 |
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Temporally Distributed?
variable.detail.tempDistributedHelp
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Yes |
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Regular Temporal Grain?
variable.detail.regularTempGrainHelp
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Yes |
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Temporal Grain Size Value
variable.detail.tempGrainSizeValHelp
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1 |
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Temporal Grain Size Units
variable.detail.tempGrainSizeUnitHelp
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Year |
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Temporal Density
variable.detail.tempDensityHelp
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Not applicable |
Variable Values
Percent forest land ?Comment:Forest land is a land cover/use category that is at least 10 percent stocked by single-stemmed woody species of any size that will be at least 4 meters (13 feet) tall at maturity. Also included is land bearing evidence of natural regeneration of tree cover (cut over forest or abandoned farmland) and not currently developed for no forest use. Ten percent stocked, when viewed from a vertical direction, equates to an aerial canopy cover of leaves and branches of 25 percent or greater. The minimum area for classification as forest land is 1 acre, and the area must be at least 100 feet wide. The model also includes a percent forest land squared term and its coefficient. |
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| % | |
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Min Value
variable.detail.minEstHelp
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0.0 |
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Max Value
variable.detail.estHelp
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95.26 |
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Other Value Type
variable.detail.natureOtherEstHelp
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Mean |
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Other Value
variable.detail.otherEstHelp
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28.85 |
Variable Variability and Sensitivity
Percent forest land ?Comment:Forest land is a land cover/use category that is at least 10 percent stocked by single-stemmed woody species of any size that will be at least 4 meters (13 feet) tall at maturity. Also included is land bearing evidence of natural regeneration of tree cover (cut over forest or abandoned farmland) and not currently developed for no forest use. Ten percent stocked, when viewed from a vertical direction, equates to an aerial canopy cover of leaves and branches of 25 percent or greater. The minimum area for classification as forest land is 1 acre, and the area must be at least 100 feet wide. The model also includes a percent forest land squared term and its coefficient. |
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Variability Expression Given?
variable.detail.variabilityExpHelp
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Yes | |
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Variability Metric
variable.detail.variabilityMetricHelp
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Variability Value
variable.detail.variabilityValueHelp
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Variability Units
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Resampling Used?
variable.detail.bootstrappingHelp
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No | |
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Variability Expression Used in Modeling?
variable.detail.variabilityUsedHelp
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No |
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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