Aggregate Block Table by Matches and County — block2prec_by

Performs the same type of operation as block2prec, but subsets a precinct geometry based on a County fips column. This helps get around the problem that county geometries often have borders that follow rivers and lead to funny shaped blocks. This guarantees that every block is matched to a precinct which is in the same county.

block2prec_by_county(block_table, precinct, precinct_county_fips, epsg = 3857)

Arguments

block_table: Required. Block table output from create_block_table
precinct: sf dataframe of shapefiles to match to.
precinct_county_fips: Column within precincts
epsg: numeric EPSG code to planarize to. Default is 3857.

Value

dataframe with nrow(precinct) rows

Examples

if (FALSE) { # \dontrun{
# Need Census API
data(towns)
towns$fips <- '087'
block <- create_block_table('NY', 'Rockland')
block2prec_by_county(block, towns, 'fips')
} # }