Model Variable
|
Description
|
Source
|
Maps
|
Income
|
Median household income by
census block group in 2000. Census block groups with median household
incomes below the township average were coded with a value of 1, while
those above the average were coded with a value of 0.
|
2000 US Census of Population and Housing |
|
Crime
|
Adult and juvenile crimes by
census block group in 2004. Density of juvenile and adult crimes was
calculated by dividing the total number of crimes in the census block
group by the block group area. Census block groups with crime density
values greater than the township average were coded with a value of 1,
while those below the average were coded with a value of 0.
|
SAVI Community Information System
|
|
Zoning
|
Residential zoning in Center
Township was delineated using the Indianapolis Department of
Metropolitan Development's zoning GIS layer. All residential zoning was
coded with a value of 1. All other zoning types were given a value of
0.
|
Indianapolis Mapping and Geographic Infrastructure
System (IMAGIS) |
|
Industrial Emissions
|
Locations in Center Township
with Title V industrial emission permits were buffered at a distance of
1/4 mile. Areas within 1/4 mile of a Title V locations were coded with
a value of 1. All other areas were given a value of 0.
|
Indianapolis Mapping and Geographic Infrastructure
System (IMAGIS) |
|
Pediatric
Asthma
|
Pediatric asthma rates by zip
code in 2000 based on hospital discharge data for children ages 5 to
14. Zip code polygons with higher than average rates for the township
were given a value of 1. All other areas were given a value of 0.
|
Health and
Hospital Corporation of Marion County |
|
Major
Roads
|
Emissions from vehicles are
among the major contributors to air pollution in cities. Areas within
500 feet of major road center lines were coded with a value of 1. All
other areas were given a value of 0. Major roads include expressways,
freeways, primary and secondary arteries, and selected collector streets
with heavy traffic.
|
Indianapolis Mapping and Geographic Infrastructure
System (IMAGIS) |
|
Surface Temperatures
|
Radiant surface temperatures
in Center Township were measured by the Enhanced Thematic Mapper Plus (ETM+)
sensor on board the Landsat 7 satellite. The thermal band of the ETM+
has a spatial resolution of 60 m. Areas with radiant surface
temperatures above the township average were coded with a value of 1,
while those below the township average were coded with a value of 0.
|
Department of Geography
Indiana University Purdue University Indianapolis
|
 |
Tree Canopy Density
|
Tree canopy density within an
800 foot buffer was derived from the data described in the
tree canopy mapping
section of this report. Percent area covered by tree canopy within the
buffer was computed. Areas below the township average canopy density
were coded with a value of 1, while those above the township average
were coded with a value of 0. |
Department of Geography
Indiana University Purdue University Indianapolis |
|
Impervious Surface Density
|
Estimates of impervious
surface coverage were derived from GIS data that combined building
footprints, road center line buffers, and impervious surface areas
delineated in the IMAGIS database. Percent impervious cover within an
500 foot buffer was calculated. Areas above the township average
impervious density were coded with a value of 1, while those below the
township average were coded with a value of 0. |
Indianapolis Mapping and Geographic
Infrastructure System (IMAGIS) |
|
