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Variables Details
: (EM-654)
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EM Identity and Description
| EM-654 | |
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Document Author
variable.detail.emDocumentAuthorHelp
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Qiu, J. and M. G. Turner |
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Document Year
variable.detail.emDocumentYearHelp
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2013 |
Variable General Info
Distance to major roads ?Comment:To quantify access, we obtained road data layer from topologically integrated geographic encoding and referencing (TIGER) of US Census Bureau (71) and performed a buffer analysis based on these road networks. We assumed that larger roads could provide more recreational access to more people for recreation, and we varied buffer distance according to road type: 2,000 m for highways and 500 m for other roads. Road buffers were then weighted to a scale ranging from 0 to 20 based on the square root of distance, with areas closer to roads assigned higher scores. |
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Variable ID
variable.detail.varIdHelp
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15361 |
| Roadi | |
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Qualitative-Quantitative
variable.detail.continuousCategoricalHelp
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Qualitative (Class, Rating or Ranking) |
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Cardinal-Ordinal
variable.detail.cardinalOrdinalHelp
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Ordinal |
| Not applicable |
Variable Typology
Distance to major roads ?Comment:To quantify access, we obtained road data layer from topologically integrated geographic encoding and referencing (TIGER) of US Census Bureau (71) and performed a buffer analysis based on these road networks. We assumed that larger roads could provide more recreational access to more people for recreation, and we varied buffer distance according to road type: 2,000 m for highways and 500 m for other roads. Road buffers were then weighted to a scale ranging from 0 to 20 based on the square root of distance, with areas closer to roads assigned higher scores. |
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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
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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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4. Human-Produced Stressor or Enhancer of Ecosystem Goods and Services Production |
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--Nonnatural structures associated with ecosystem access, enhancement, restoration or water storage |
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----Nonnatural structures associated with ecosystem access by humans (e.g., boat launch) |
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Variable Spatial Characteristics
Distance to major roads ?Comment:To quantify access, we obtained road data layer from topologically integrated geographic encoding and referencing (TIGER) of US Census Bureau (71) and performed a buffer analysis based on these road networks. We assumed that larger roads could provide more recreational access to more people for recreation, and we varied buffer distance according to road type: 2,000 m for highways and 500 m for other roads. Road buffers were then weighted to a scale ranging from 0 to 20 based on the square root of distance, with areas closer to roads assigned higher scores. |
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Spatial Extent Area
variable.detail.spExtentHelp
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1000-10,000 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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area, for pixel or radial feature |
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Spatial Grain Size
variable.detail.spGrainSizeHelp
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30m x 30m |
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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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Variable Temporal Characteristics
Distance to major roads ?Comment:To quantify access, we obtained road data layer from topologically integrated geographic encoding and referencing (TIGER) of US Census Bureau (71) and performed a buffer analysis based on these road networks. We assumed that larger roads could provide more recreational access to more people for recreation, and we varied buffer distance according to road type: 2,000 m for highways and 500 m for other roads. Road buffers were then weighted to a scale ranging from 0 to 20 based on the square root of distance, with areas closer to roads assigned higher scores. |
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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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Not applicable |
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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
Distance to major roads ?Comment:To quantify access, we obtained road data layer from topologically integrated geographic encoding and referencing (TIGER) of US Census Bureau (71) and performed a buffer analysis based on these road networks. We assumed that larger roads could provide more recreational access to more people for recreation, and we varied buffer distance according to road type: 2,000 m for highways and 500 m for other roads. Road buffers were then weighted to a scale ranging from 0 to 20 based on the square root of distance, with areas closer to roads assigned higher scores. |
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| Not applicable | |
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Min Value
variable.detail.minEstHelp
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Not applicable |
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Max Value
variable.detail.estHelp
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Not applicable |
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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
Distance to major roads ?Comment:To quantify access, we obtained road data layer from topologically integrated geographic encoding and referencing (TIGER) of US Census Bureau (71) and performed a buffer analysis based on these road networks. We assumed that larger roads could provide more recreational access to more people for recreation, and we varied buffer distance according to road type: 2,000 m for highways and 500 m for other roads. Road buffers were then weighted to a scale ranging from 0 to 20 based on the square root of distance, with areas closer to roads assigned higher scores. |
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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?
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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