subset_county_polygons: subset_county_polygons

In USGS-R/wateRuse_swuds: Site-Specific Water-Use Data System

Description

Returns county polygons from: Siczewicz, Peter. U.S. Historical Counties (Generalized .001 deg) on the basis of year of interest Dataset is subset on basis of area of interest

Usage

subset_county_polygons(year, area_column, areas)

Arguments

year	int, the year of interest to be mapped (defines historical basis for counties)
area_column	chr, defines which column to use to specify area
areas	chr, vector of codes indicating HUCs, counties, states, regions, aquifers, etc.

Value

hc_sub dataframe, a subset of county polygon data

Examples

areas <- "Delaware" # 3 counties present day
area_column <- "STATE_TERR"
year <- 2010
hc_sub <- subset_county_polygons(year, area_column, areas)
hc_sub$NAME
areas <- "Maine" # 16 counties present day
area_column <- "STATE_TERR"
year <- 2010
hc_sub <- subset_county_polygons(year, area_column, areas)
hc_sub$NAME
year <- 1850 # Maine had 13 counties in 1850; Delaware 3
hc_sub <- subset_county_polygons(year, area_column, areas)
hc_sub$NAME

USGS-R/wateRuse_swuds documentation built on Dec. 8, 2019, 9:47 a.m.