Module: USGeo::Population

Included in:

CombinedStatisticalArea, CoreBasedStatisticalArea, County, CountySubdivision, Division, MetropolitanDivision, Place, Region, State, UrbanArea, Zcta

Defined in:

lib/us_geo/population.rb

Overview

This module is mixed into all models with a population and land area.

Instance Attribute Summary

• #housing_units ⇒ Integer^?

  Total housing units in the area.

• #population ⇒ Integer^?

  Total population of the area.

Instance Method Summary

• #population_density ⇒ Float^?

  Population per square mile.

• #population_density_km ⇒ Float^?

  Population per square kilometer.

Instance Attribute Details

#housing_units ⇒ Integer^?

Returns Total housing units in the area.

Returns:

• (Integer, nil) —

  Total housing units in the area.

# File 'lib/us_geo/population.rb', line 9

#population ⇒ Integer^?

Returns Total population of the area.

Returns:

• (Integer, nil) —

  Total population of the area.

# File 'lib/us_geo/population.rb', line 6

Instance Method Details

#population_density ⇒ Float^?

Population per square mile.

Returns:

• (Float, nil)

# File 'lib/us_geo/population.rb', line 15

def population_density
  population.to_f / land_area if population && land_area.to_f > 0
end

#population_density_km ⇒ Float^?

Population per square kilometer.

Returns:

• (Float, nil)

# File 'lib/us_geo/population.rb', line 22

def population_density_km
  population.to_f / land_area_km if population && land_area.to_f > 0
end