tractShp: Polygon layer of Dallas County, TX, census tracts

In TexMix: Supporting Functions and Data for Geo-Spatial Analytics Courses at UTDallas, Texas

Description

Census tracts in Dallas County, Texas, in the longitude and latitude format (see proj4string=CRS("+proj=longlat +ellps=WGS84")).

Attention: Two census tracts do not have a night time population and therefore NA's in most of their variables. These tracts are the airports of Love Field and DFW (see tractShp$TRACT=="48113980000" | tractShp$TRACT=="48113980100").

Format

Spatial polygon data-frame with 529 census tracts. The variables are as follows:

ID

Internal ID.

SeqId

Sequence ID of tracts from 1 to 529.

TRACT

Factor with the Census Bureau's tract numbers.

AREA

Calculated area of the census tract in square miles. Proportional to the denominator of the average store weighted kernel density.

LANDAREA

Land area of the census tract in square miles.

WATERAREA

Water area of the census tract in square miles.

nCells

Number of 100x100 meters raster cells within each census tract. Denominator of the average store weighted kernel density in each census tract.

all1500D

Average weighted kernel density of all stores with a bandwith of 1500 meters. Weights are based on store's food sales volume.

all2250D

Average weighted kernel density of all stores with a bandwith of 2250 meters. Weights are based on store's food sales volume.

all3000D

Average weighted kernel density of all stores with a bandwith of 3000 meters. Weights are based on store's food sales volume.

good2000D

Average weighted kernel density of grocery stores with a bandwith of 2000 meters. Weights are based on store's food sales volume.

good3000D

Average weighted kernel density of grocery stores with a bandwith of 3000 meters. Weights are based on store's food sales volume.

good4000D

Average weighted kernel density of grocery stores with a bandwith of 4000 meters. Weights are based on store's food sales volume.

bad1000D

Average weighted kernel density of convenience stores with a bandwith of 1000 meters. Weights are based on store's food sales volume.

bad1500D

Average weighted kernel density of convenience stores with a bandwith of 1500 meters. Weights are based on store's food sales volume.

bad2000D

Average weighted kernel density of convenience stores with a bandwith of 2000 meters. Weights are based on store's food sales volume.

LRRlowD

Average low Log-relative risk log(bad1000D/good2000D).

LRRmedD

Average medium Log-relative risk log(bad1500D/good3000D).

LRRhiD

Average high Log-relative risk log(bad2000D/good4000D).

DES3NEIG

Factor distinguishing the three putative food desert neighborhood against the remaining census tracts.

FOODDES

Factor distinguishing the 14 putative food desert census tracts against the remaining 515 census tracts.

CITYPERI

Factor distinguishing the census tracts in the city of Dallas, the Park cities, North, East, South and West census tracts.

DAYPOP

Caliper's estimate of the absolute day time population.

NIGHTPOP

Census's night time population counts in a census tract.

PCTDAYPOP

% day time population: DAYPOP/(DAYPOP+NIGHTPOP).

POPDEN

Population density: (0.4*DAYPOP+0.6*NIGHTPOP)/LANDAREA. Relative measure for potential food demand.

BUYPOW

Absolute buying power in a census tract in $. Source: IRS 2016 records. Absolute measure for potential food demand.

MALE

Census's male population count in a census tract.

FEMALE

Census's female population count in a census tract.

MEDAGE

Median population age in a census tract.

PCTWHITE

% white population in a census tract.

PCTBLACK

% black population in a census tract.

PCTASIAN

% asian population in a census tract.

PCTHISPAN

% hispanic population in a census tract.

PCTMINOR

% of population belonging to a minority.

PCTBADENG

% of population, which does not speak English well.

PCTNOHIGH

% of population 25+ without a high school degree.

PCTUNIVDEG

% of population 25+ with a univeristy degrees.

PCTNOVEH

% of households not owning a car.

PCTPUB2WRK

% of employed population taking public transportation to work.

TIME2WORK

Average travel time to work. Attention: 110 NA's.

PCTNOHINS

% of civilian population without health insurance.

PCTUNEMP

% of population in the labor force, which is unemployed.

PCTFAMPOV

% of family below the poverty threshold.

PCTPOPPOV

% of population below the poverty threshold.

HHMEDINC

Median household income in $.

MEDFAMINC

Median family income in $.

PERCAPINC

Per capita income in $.

PCTHUVAC

% of vacant housing units.

MEDVALHOME

Median home value. Attention: 27 NA's.

PCTB2010

% of homes built from 2010 to 2018.

PCTB2000

% of homes built from 2000 to 2009.

PCTB1990

% of homes built from 1990 to 1999.

PCTB1980

% of homes built from 1980 to 1989.

PCTB1970

% of homes built from 1970 to 1979.

PCTB1960

% of homes built from 1960 to 1969.

PCTB1950

% of homes built from 1950 to 1959.

PCTB1940

% of homes built from 1940 to 1949.

PCTBPRE

% of homes built before 1940.

Source

Based on 2018 ACS data, which were retrieved from Maptitude (https://www.caliper.com/). The store density statistics by census tract were calculated by the authors.

Examples

library(maptools)
validTractShp <- tractShp[!is.na(tractShp$BUYPOW), ]         # Remove 2 tracts with NA's
mapColorQual(validTractShp$CITYPERI, validTractShp,
             map.title="Cities and Peripherie in Dallas County",
             legend.title="Regions")

mapColorRamp(validTractShp$bad1500D, validTractShp, breaks=9,
             map.title="Density of Convenience Stores in Dallas County\nbw=1500 meters",
             legend.title="Junk Food")

hist(tractShp$LRRmedD)
mapBiPolar(validTractShp$LRRmedD, validTractShp, break.value=0,
           neg.breaks=5, pos.breaks=5,
           map.title="LRR: log(f(junk food),f(healthy food))\nbw=medium",
           legend.title="log relative risk")

TexMix documentation built on March 1, 2020, 5:10 p.m.