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Variables Details
: (EM-658)
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EM Identity and Description
| EM-658 | |
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Document Author
variable.detail.emDocumentAuthorHelp
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Jackson, B., T. Pagella, F. Sinclair, B. Orellana, A. Henshaw, B. Reynolds, N. Mcintyre, H. Wheater, and A. Eycott |
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Document Year
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2013 |
Variable General Info
Threshold compound topographic index ?Comment:In addition to the topographic controls represented by the CTI, the probability of soil erosion occurring at a particular location is also dependent on factors such as soil and vegetation characteristics (Morgan, 2005). These influences are represented in Polyscape through the use of user-defined critical, or threshold, CTI values. These can be empirically defined for a particular region, soil type, crop combination, etc., on the basis of local knowledge, field observations or aerial photography (cf. Thorne & Zevenbergen, 1990), or through the use of values derived for comparable sites. |
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Variable ID
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15445 |
| Not reported | |
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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 |
| m |
Variable Typology
Threshold compound topographic index ?Comment:In addition to the topographic controls represented by the CTI, the probability of soil erosion occurring at a particular location is also dependent on factors such as soil and vegetation characteristics (Morgan, 2005). These influences are represented in Polyscape through the use of user-defined critical, or threshold, CTI values. These can be empirically defined for a particular region, soil type, crop combination, etc., on the basis of local knowledge, field observations or aerial photography (cf. Thorne & Zevenbergen, 1990), or through the use of values derived for comparable sites. |
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Predictor-Intermediate-Response
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Predictor |
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Predictor Variable Type
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Constant or Parameter |
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Response Variable Type
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Not applicable |
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Data Source/Type
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Transferred Values (e.g., from literature; transferred spatially, temporally or across scales) ?Comment:The values for this variable can be determined using different methods. |
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Variable Classification Hierarchy
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2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric |
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--Geographic position, horizontal or vertical |
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----Other, multiple, unspecified or unclear |
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Variable Spatial Characteristics
Threshold compound topographic index ?Comment:In addition to the topographic controls represented by the CTI, the probability of soil erosion occurring at a particular location is also dependent on factors such as soil and vegetation characteristics (Morgan, 2005). These influences are represented in Polyscape through the use of user-defined critical, or threshold, CTI values. These can be empirically defined for a particular region, soil type, crop combination, etc., on the basis of local knowledge, field observations or aerial photography (cf. Thorne & Zevenbergen, 1990), or through the use of values derived for comparable sites. |
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Spatial Extent Area
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Not recorded for Constant or Parameter Variables |
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Spatially Distributed?
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Not recorded for Constant or Parameter Variables |
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Observations Spatially Patterned?
variable.detail.regularSpGrainHelp
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Not recorded for Constant or Parameter Variables |
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Spatial Grain Type
variable.detail.spGrainTypeHelp
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Not recorded for Constant or Paarameter Variables |
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Spatial Grain Size
variable.detail.spGrainSizeHelp
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Not recorded for Constant or Parameter Variables |
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Spatial Density
variable.detail.spDensityHelp
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Not recorded for Constant or Parameter Variables |
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EnviroAtlas URL
variable.detail.enviroAtlasURLHelp
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Variable Temporal Characteristics
Threshold compound topographic index ?Comment:In addition to the topographic controls represented by the CTI, the probability of soil erosion occurring at a particular location is also dependent on factors such as soil and vegetation characteristics (Morgan, 2005). These influences are represented in Polyscape through the use of user-defined critical, or threshold, CTI values. These can be empirically defined for a particular region, soil type, crop combination, etc., on the basis of local knowledge, field observations or aerial photography (cf. Thorne & Zevenbergen, 1990), or through the use of values derived for comparable sites. |
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Temporal Extent
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Not recorded for Constant or Parameter Variables |
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Temporally Distributed?
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Not recorded for Constant or Parameter Variables |
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Regular Temporal Grain?
variable.detail.regularTempGrainHelp
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Not recorded for Constant or Parameter Variables |
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Temporal Grain Size Value
variable.detail.tempGrainSizeValHelp
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Not recorded for Constant or Parameter Variables |
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Temporal Grain Size Units
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Not recorded for Constant or Parameter Variables |
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Temporal Density
variable.detail.tempDensityHelp
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Not recorded for Constant or Parameter Variables |
Variable Values
Threshold compound topographic index ?Comment:In addition to the topographic controls represented by the CTI, the probability of soil erosion occurring at a particular location is also dependent on factors such as soil and vegetation characteristics (Morgan, 2005). These influences are represented in Polyscape through the use of user-defined critical, or threshold, CTI values. These can be empirically defined for a particular region, soil type, crop combination, etc., on the basis of local knowledge, field observations or aerial photography (cf. Thorne & Zevenbergen, 1990), or through the use of values derived for comparable sites. |
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m ?Comment:Areas of “opportunity for change” have CTI values (see Section 2.3 for definition) exceeding 10 m, while areas of “high opportunity for change” have CTI values exceeding 50 m. These thresholds were selected on the basis of empirically derived critical CTI values presented in Parker et al. (2010). |
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Min Value
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Not reported |
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Max Value
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50 |
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Other Value Type
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Single Observation or Parameter Value |
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Other Value
variable.detail.otherEstHelp
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10 |
Variable Variability and Sensitivity
Threshold compound topographic index ?Comment:In addition to the topographic controls represented by the CTI, the probability of soil erosion occurring at a particular location is also dependent on factors such as soil and vegetation characteristics (Morgan, 2005). These influences are represented in Polyscape through the use of user-defined critical, or threshold, CTI values. These can be empirically defined for a particular region, soil type, crop combination, etc., on the basis of local knowledge, field observations or aerial photography (cf. Thorne & Zevenbergen, 1990), or through the use of values derived for comparable sites. |
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Variability Expression Given?
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Not recorded for Constant or Parameter Variables |
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Variability Metric
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None |
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Variability Value
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None |
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Variability Units
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None |
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Resampling Used?
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Not recorded for Constant or Parameter Variables |
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Variability Expression Used in Modeling?
variable.detail.variabilityUsedHelp
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Not recorded for Constant or Parameter Variables |
Variable Operational Validation (Response Variables only)
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Variable ID
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Validated?
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Validation Approach (within, between, etc.)
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Validation Quality (Qual/Quant)
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Validation Method (Stat/Deviance)
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Validation Metric
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Validation Value
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Validation Units
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Use of Measured Response Data
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