Scientific Investigations Report 2006–5101–D
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5101–D
Table A2. Variables used to derive the final urban intensity index.
[Abbreviations: NLCD, National land cover data; mi, mile; mi2, square mile]
| Variable code |
Definition | Spearmans’ rho |
|---|---|---|
| Census Variables | ||
| SEI_3 | Socioeconomic Index 3: Principal component 3 for 63 socioeconomic variables (2000 census block-group based) | 0.92 |
| HHDEN | Household density (occupied housing units per square kilometer) (2000 census block-group based) | .99 |
| PPURBAN | Proportion of population living in urban area (2000 census block-group based) | .92 |
| PP_SH95 | Percentage of population living in same house as in 1995 (2000 census block-group based) | -.80 |
| PHUT | Percentage of occupied housing units using utility gas (natural gas) as fuel (2000 census block-group based) | .78 |
| PHLP | Percentage of occupied housing units using liquid petroleum gas as fuel (2000 census block-group based) | -.78 |
| PHWOOD | Percentage of occupied housing units using wood as fuel (2000 census block-group based) | -.90 |
| HUDEN | Density of housing units (housing units per square kilometer) (2000 cesnsus block-group based) | .99 |
| PPRURAL | Proportion of population living in rural area (2000 census block-group based) | -.92 |
| PC_US | Proportion of citizens born in United States (2000 census block-group based) | -.81 |
| PHU_G60 | Proportion of housing units built prior to 1939 (2000 census block-group based) | -.73 |
| PPASIA | Proportion of population of Asian ancestry (2000 census block-group based) | .74 |
| NLCD 2000 Land Cover/Land Use Variables | ||
| pNLCD1_2 | Aggregated NLCD 2000 “level 1” category: developed (percentage of basin area) | 0.98 |
| pNLCD1_3 | Aggregated NLCD 2000 “level 1” category: barren (includes all level 2 barren and unconsolidated categories) (percentage of basin area) | -.79 |
| pNLCD1_4 | Aggregated NLCD 2000 “level 1” category: forest (percentage of basin area) | -.91 |
| pNLCD1_5 | Aggregated NLCD 2000 “level 1” category: shrubland (includes all level 2 shrub and scrub categories) (percentage of basin area) | -.85 |
| NLCD_IS | NLCD 2000 mean percent impervious surface | .98 |
| NLCD 2000 Riparian Buffer Variables | ||
| pNLCD1_B2 | Buffer area in aggregated NLCD00 “level 1” category: developed (percentage of basin area) | 0.97 |
| pNLCD1_B3 | Buffer area in aggregated NLCD 2000 “level 1” category: barren (includes all level 2 barren and unconsolidated categories) (percentage of basin area) | -.82 |
| pNLCD1_B4 | Buffer area in aggregated NLCD 2000 “level 1” category: forest (percentage of basin area) | -.83 |
| pNLCD1_B5 | Buffer area in aggregated NLCD 2000 “level 1” category: shrubland (includes all level 2 shrub and scrub categories) (percentage of basin area) | -.87 |
| NLCD_BIS | NLCD 2000 mean percent impervious surface | .97 |
| Infrastructure Variables | ||
| ROADDEN | Road density in watershed = [RDLENGTH (mi) / watershed area (mi2)] | 0.95 |
| RDTRINDX | Road traffic index in watershed (weighted miles): road traffic index i = SUM j (length ij * Veh_Traffic_Wt ij) for watershed I and CFCC TIGER code j | .73 |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2006/5101-D
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