FIPS - for a set of points (lat,lon) quickly find the blockgroup each is inside

FIPS - for a set of points (lat,lon) quickly find the blockgroup each is inside

Usage

fips_bg_from_latlon(
  df = testpoints_10[1:2, ],
  nblocks = 50,
  nbg = 3,
  radius1 = 3,
  quiet = TRUE
)

Arguments

df

data.frame or data.table with columns lat, lon, and ejam_uniq_id

nblocks

number of candidate blocks to check at each site

nbg

number of candidate blockgroups to download for each site

radius1

initial search radius for relevant block points

quiet

whether to print more while it downloads etc.

Value

vector of blockgroup FIPS codes, same length as NROW(df)

See also

state_from_latlon() (different approach, unclear which is faster)

Examples

if (FALSE) { # \dontrun{
# Looks like it finds the right blockgroup:
x10 = fips_bg_from_latlon(testpoints_10)
mapfast( data.frame(ejam_uniq_id = x10[3]) )
mapfast(testpoints_10[3, ], radius = 0.1)

# Looks like it finds the right blockgroup:
x100 = fips_bg_from_latlon(testpoints_100)
mapfast( data.frame(ejam_uniq_id = x100[34]) )
mapfast(testpoints_100[34, ], radius = 0.1)
  } # }