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Variables Details
: (EM-142)
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EM Identity and Description
| EM-142 | |
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Document Author
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US EPA Office of Research and Development - National Exposure Research Laboratory |
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Document Year
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2013 |
Variable General Info
Impervious cover ?Comment:Impervious cover was determined for each census block group. As census block group is a class variable for this entry, thus impervious cover is a constant per census block group. |
Land area (census block group) ?Comment:Land area was determined for each census block group. As census block group is a class variable for this entry, thus land area is a constant per census block group. |
Land area (watershed) |
Streamflow (of watershed per tree cover/impervious cover combination) ?Comment:Streamflow for the entire watershed was modelled using the i-Tree Hydro model. Model runs were processed for every combination of tree cover (0-100%) combined with every combination of impervious cover (0-100%). The results essentially provide a look up table of constants for each cover combination to input into the EnviroAtlas computation. |
Tree cover ?Comment:Tree cover was determined for each census block group. As census block group is a class variable for this entry, thus tree cover is a constant per census block group. |
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Variable ID
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1913 | 1918 | 10658 | 10659 | 1912 |
| IMP_PCT | LNDSQM | Not reported | Not reported | CAN_PCT | |
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Qualitative-Quantitative
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Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) |
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Cardinal-Ordinal
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Cardinal | Cardinal | Cardinal | Cardinal | Cardinal |
| % | m^2 | km^2 | m^3 yr^-1 | % |
Variable Typology
Impervious cover ?Comment:Impervious cover was determined for each census block group. As census block group is a class variable for this entry, thus impervious cover is a constant per census block group. |
Land area (census block group) ?Comment:Land area was determined for each census block group. As census block group is a class variable for this entry, thus land area is a constant per census block group. |
Land area (watershed) |
Streamflow (of watershed per tree cover/impervious cover combination) ?Comment:Streamflow for the entire watershed was modelled using the i-Tree Hydro model. Model runs were processed for every combination of tree cover (0-100%) combined with every combination of impervious cover (0-100%). The results essentially provide a look up table of constants for each cover combination to input into the EnviroAtlas computation. |
Tree cover ?Comment:Tree cover was determined for each census block group. As census block group is a class variable for this entry, thus tree cover is a constant per census block group. |
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Predictor-Intermediate-Response
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Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
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Predictor Variable Type
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Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter |
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Response Variable Type
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Data Source/Type
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Map or database (e.g., wide coverage, wide availability, measured or modeled) ?Comment:Derived from land cover databases; DurhamLCFE_Grid, and USGS NLCD 2010. |
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) ?Comment:Streamflow for the entire watershed was modelled using the i-Tree Hydro model. Model runs were processed for every combination of tree cover (0-100%) combined with every combination of impervious cover (0-100%). |
Map or database (e.g., wide coverage, wide availability, measured or modeled) ?Comment:Derived from land cover databases; DurhamLCFE_Grid, and USGS NLCD 2010. |
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Variable Classification Hierarchy
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2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric |
2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric |
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 |
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--Land use/land cover type or dominant habitat type |
--Spatial resolution or extent of cell, pixel, polygon |
--Demarcation of watershed, channel, floodplain, shore, coastline, flowline |
--Physical/chemical characteristics of nonliving ecosystem components |
--Biological characteristics, processes or requirements of living ecosystem components |
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----Developed and urban land cover |
----Watershed demarcation or dimension |
----Physical/chemical characteristics of water |
----Biological characteristics, processes or requirements of flora and fungi |
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------Perviousness |
------Water volume or flow in rivers or streams |
------Cover characteristics (canopy cover, herbaceous cover or leaf area) |
Variable Spatial Characteristics
Impervious cover ?Comment:Impervious cover was determined for each census block group. As census block group is a class variable for this entry, thus impervious cover is a constant per census block group. |
Land area (census block group) ?Comment:Land area was determined for each census block group. As census block group is a class variable for this entry, thus land area is a constant per census block group. |
Land area (watershed) |
Streamflow (of watershed per tree cover/impervious cover combination) ?Comment:Streamflow for the entire watershed was modelled using the i-Tree Hydro model. Model runs were processed for every combination of tree cover (0-100%) combined with every combination of impervious cover (0-100%). The results essentially provide a look up table of constants for each cover combination to input into the EnviroAtlas computation. |
Tree cover ?Comment:Tree cover was determined for each census block group. As census block group is a class variable for this entry, thus tree cover is a constant per census block group. |
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Spatial Extent Area
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
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Spatially Distributed?
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
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Observations Spatially Patterned?
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
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Spatial Grain Type
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
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Spatial Grain Size
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
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Spatial Density
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
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EnviroAtlas URL
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Percent Impervious Area | The Watershed Boundary Dataset (WBD) | National Hydrography Dataset Plus (NHD PlusV2) |
Variable Temporal Characteristics
Impervious cover ?Comment:Impervious cover was determined for each census block group. As census block group is a class variable for this entry, thus impervious cover is a constant per census block group. |
Land area (census block group) ?Comment:Land area was determined for each census block group. As census block group is a class variable for this entry, thus land area is a constant per census block group. |
Land area (watershed) |
Streamflow (of watershed per tree cover/impervious cover combination) ?Comment:Streamflow for the entire watershed was modelled using the i-Tree Hydro model. Model runs were processed for every combination of tree cover (0-100%) combined with every combination of impervious cover (0-100%). The results essentially provide a look up table of constants for each cover combination to input into the EnviroAtlas computation. |
Tree cover ?Comment:Tree cover was determined for each census block group. As census block group is a class variable for this entry, thus tree cover is a constant per census block group. |
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Temporal Extent
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
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Temporally Distributed?
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
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Regular Temporal Grain?
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
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Temporal Grain Size Value
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
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Temporal Grain Size Units
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
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Temporal Density
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
Variable Values
Impervious cover ?Comment:Impervious cover was determined for each census block group. As census block group is a class variable for this entry, thus impervious cover is a constant per census block group. |
Land area (census block group) ?Comment:Land area was determined for each census block group. As census block group is a class variable for this entry, thus land area is a constant per census block group. |
Land area (watershed) |
Streamflow (of watershed per tree cover/impervious cover combination) ?Comment:Streamflow for the entire watershed was modelled using the i-Tree Hydro model. Model runs were processed for every combination of tree cover (0-100%) combined with every combination of impervious cover (0-100%). The results essentially provide a look up table of constants for each cover combination to input into the EnviroAtlas computation. |
Tree cover ?Comment:Tree cover was determined for each census block group. As census block group is a class variable for this entry, thus tree cover is a constant per census block group. |
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| Not reported | Not reported | Not applicable | Not reported | Not reported | |
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Min Value
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Not reported | Not reported | Not applicable | Not reported | Not reported |
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Max Value
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Not reported | Not reported | Not applicable | Not reported | Not reported |
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Other Value Type
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Not reported | Not reported | Single Observation or Parameter Value | Not applicable | Not reported |
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Other Value
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Not reported | Not reported | 569.4 | Not reported | Not reported |
Variable Variability and Sensitivity
Impervious cover ?Comment:Impervious cover was determined for each census block group. As census block group is a class variable for this entry, thus impervious cover is a constant per census block group. |
Land area (census block group) ?Comment:Land area was determined for each census block group. As census block group is a class variable for this entry, thus land area is a constant per census block group. |
Land area (watershed) |
Streamflow (of watershed per tree cover/impervious cover combination) ?Comment:Streamflow for the entire watershed was modelled using the i-Tree Hydro model. Model runs were processed for every combination of tree cover (0-100%) combined with every combination of impervious cover (0-100%). The results essentially provide a look up table of constants for each cover combination to input into the EnviroAtlas computation. |
Tree cover ?Comment:Tree cover was determined for each census block group. As census block group is a class variable for this entry, thus tree cover is a constant per census block group. |
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Variability Expression Given?
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
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Variability Metric
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None | None | None | None | None |
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Variability Value
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None | None | None | None | None |
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Variability Units
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None | None | None | None | None |
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Resampling Used?
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables |
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Variability Expression Used in Modeling?
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Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor Variables | Not recorded for Constant or Factor 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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