Aggregate a Block Table by Matches Within County — block2prec_by

Variant of block2prec() that matches blocks to precincts separately within each county. This helps avoid cross-county mismatches when county boundaries and census blocks do not line up cleanly.

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

Arguments

block_table: Block table, usually from create_block_table().
precinct: sf object of target precinct shapes.
precinct_county_fips: Name of the county identifier column in precinct.
epsg: numeric EPSG code to planarize to. Default is 3857.

Value

dataframe with one row per row of precinct, ordered to align with the input precinct object.

Examples

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