EcoService Models Library (ESML)
Home
Search EMs
My
EMs 
Learn about
ESML
View ESML Data Maploading
Variables Details
: (EM-654)
Back
Collapse All
Expand All
- Export Data to Spreadsheet (Free Viewers)
- View Variable Relationship Diagram (PDF)(1 pp, 80 KB, About PDF)
EM Identity and Description
| EM-654 | |
|
Document Author
variable.detail.emDocumentAuthorHelp
?
|
Qiu, J. and M. G. Turner |
|
Document Year
variable.detail.emDocumentYearHelp
?
|
2013 |
Variable General Info
Proximity to population centers ?Comment:To quantify proximity to population centers, we created a population density layer with 500-m spatial resolution based on the US Census tract-level resident population data for 2000, by using a moving window analysis that summed the population density of tracts having their centers within 10 km of each grid cell. We also used Jenks algorithm to classify the population density layer into 10 natural breaks, then weighted these values to the range of 0–40. |
|
|
Variable ID
variable.detail.varIdHelp
?
|
15360 |
| Popi | |
|
Qualitative-Quantitative
variable.detail.continuousCategoricalHelp
?
|
Qualitative (Class, Rating or Ranking) |
|
Cardinal-Ordinal
variable.detail.cardinalOrdinalHelp
?
|
Ordinal |
| Not applicable |
Variable Typology
Proximity to population centers ?Comment:To quantify proximity to population centers, we created a population density layer with 500-m spatial resolution based on the US Census tract-level resident population data for 2000, by using a moving window analysis that summed the population density of tracts having their centers within 10 km of each grid cell. We also used Jenks algorithm to classify the population density layer into 10 natural breaks, then weighted these values to the range of 0–40. |
|
|
Predictor-Intermediate-Response
variable.detail.displayVariableTypeHelp
?
|
Predictor |
|
Predictor Variable Type
variable.detail.displayPredictorVariableTypeHelp
?
|
Time- or Space-varying Variable |
|
Response Variable Type
variable.detail.resClassHelp
?
|
Not applicable |
|
Data Source/Type
variable.detail.dataTypeHelp
?
|
Map or database (e.g., wide coverage, wide availability, measured or modeled) |
|
Variable Classification Hierarchy
variable.detail.vchLevel1Help
?
|
3. Human Demographic Data |
|
--Population number, density and growth |
|
Variable Spatial Characteristics
Proximity to population centers ?Comment:To quantify proximity to population centers, we created a population density layer with 500-m spatial resolution based on the US Census tract-level resident population data for 2000, by using a moving window analysis that summed the population density of tracts having their centers within 10 km of each grid cell. We also used Jenks algorithm to classify the population density layer into 10 natural breaks, then weighted these values to the range of 0–40. |
|
|
Spatial Extent Area
variable.detail.spExtentHelp
?
|
1000-10,000 km^2. |
|
Spatially Distributed?
variable.detail.spDistributedHelp
?
|
Yes |
|
Observations Spatially Patterned?
variable.detail.regularSpGrainHelp
?
|
Yes |
|
Spatial Grain Type
variable.detail.spGrainTypeHelp
?
|
area, for pixel or radial feature |
|
Spatial Grain Size
variable.detail.spGrainSizeHelp
?
|
500m x 500m |
|
Spatial Density
variable.detail.spDensityHelp
?
|
Not applicable |
|
EnviroAtlas URL
variable.detail.enviroAtlasURLHelp
?
|
Dasymetric Allocation of Population |
Variable Temporal Characteristics
Proximity to population centers ?Comment:To quantify proximity to population centers, we created a population density layer with 500-m spatial resolution based on the US Census tract-level resident population data for 2000, by using a moving window analysis that summed the population density of tracts having their centers within 10 km of each grid cell. We also used Jenks algorithm to classify the population density layer into 10 natural breaks, then weighted these values to the range of 0–40. |
|
|
Temporal Extent
variable.detail.tempExtentHelp
?
|
2000 |
|
Temporally Distributed?
variable.detail.tempDistributedHelp
?
|
Not applicable |
|
Regular Temporal Grain?
variable.detail.regularTempGrainHelp
?
|
Not applicable |
|
Temporal Grain Size Value
variable.detail.tempGrainSizeValHelp
?
|
Not applicable |
|
Temporal Grain Size Units
variable.detail.tempGrainSizeUnitHelp
?
|
Not applicable |
|
Temporal Density
variable.detail.tempDensityHelp
?
|
Not applicable |
Variable Values
Proximity to population centers ?Comment:To quantify proximity to population centers, we created a population density layer with 500-m spatial resolution based on the US Census tract-level resident population data for 2000, by using a moving window analysis that summed the population density of tracts having their centers within 10 km of each grid cell. We also used Jenks algorithm to classify the population density layer into 10 natural breaks, then weighted these values to the range of 0–40. |
|
| Not applicable | |
|
Min Value
variable.detail.minEstHelp
?
|
Not applicable |
|
Max Value
variable.detail.estHelp
?
|
Not applicable |
|
Other Value Type
variable.detail.natureOtherEstHelp
?
|
Not applicable |
|
Other Value
variable.detail.otherEstHelp
?
|
Not applicable |
Variable Variability and Sensitivity
Proximity to population centers ?Comment:To quantify proximity to population centers, we created a population density layer with 500-m spatial resolution based on the US Census tract-level resident population data for 2000, by using a moving window analysis that summed the population density of tracts having their centers within 10 km of each grid cell. We also used Jenks algorithm to classify the population density layer into 10 natural breaks, then weighted these values to the range of 0–40. |
|
|
Variability Expression Given?
variable.detail.variabilityExpHelp
?
|
No |
|
Variability Metric
variable.detail.variabilityMetricHelp
?
|
None |
|
Variability Value
variable.detail.variabilityValueHelp
?
|
None |
|
Variability Units
|
None |
|
Resampling Used?
variable.detail.bootstrappingHelp
?
|
Not applicable |
|
Variability Expression Used in Modeling?
variable.detail.variabilityUsedHelp
?
|
Not applicable |
Variable Operational Validation (Response Variables only)
|
Variable ID
variable.detail.varIdHelp
?
|
|
Validated?
variable.detail.resValidatedHelp
?
|
|
Validation Approach (within, between, etc.)
variable.detail.validationApproachHelp
?
|
|
Validation Quality (Qual/Quant)
variable.detail.validationQualityHelp
?
|
|
Validation Method (Stat/Deviance)
variable.detail.validationMethodHelp
?
|
|
Validation Metric
variable.detail.validationMetricHelp
?
|
|
Validation Value
variable.detail.validationValHelp
?
|
|
Validation Units
|
|
Use of Measured Response Data
variable.detail.measuredResponseDataHelp
?
|