[R] Plot by FIPS Code using Shapefiles

[Anthony Damico]

hi, after running each individual line of code above, check that the object
still has the expected number of records and unique county fips codes.  it
looks like length( shapes$GEOID ) == 3233 but nrow( merged_data ) == 3109.
the way for you to debug this is for you to go through line by line after
creating each new object  :)

i'm also not sure it's safe to work with gis objects as you're doing, there
are some well-documented examples of working with tiger files here
https://github.com/davidbrae/swmap



On Tue, May 5, 2015 at 11:00 AM, Shouro Dasgupta <shouro at gmail.com> wrote:

> I am trying to plot data by FIPS code using county shapes files.
>
> library(data.table)
> > library(rgdal)
> > library(colourschemes)
> > library(RColorBrewer)
> > library(maptools)
> > library(maps)
> > library(ggmap)
>
>
> I have data by FIPS code which looks like this:
> >
> >
> > dput(head(max_change))
> > structure(list(FIPS = c("01001", "01003", "01005", "01007", "01009",
> > "01011"), pred_hist = c(5.68493780563595e-06, 5.87686839563543e-06,
> > 5.68493780563595e-06, 5.84476370329784e-06, 5.89156133294344e-06,
> > 5.68493780563595e-06), pred_sim = c(5.60128903156804e-06,
> > 5.82369276823497e-06,
> > 5.60128903156804e-06, 5.75205304048323e-06, 5.80322399836766e-06,
> > 5.60128903156804e-06), change = c(-1.47141054005866, -0.904829303986895,
> > -1.47141054005866, -1.58621746782168, -1.49938750670105,
> -1.47141054005866
> > )), .Names = c("FIPS", "pred_hist", "pred_sim", "change"), class =
> > c("data.table",
> > "data.frame"), row.names = c(NA, -6L), .internal.selfref = <pointer:
> > 0x0000000000110788>)
>
>
>  I add leading zeroes by:
>
> max_change <- as.data.table(max_change)
> max_change$FIPS <- sprintf("%05d",as.numeric(max_change$FIPS))
>
> I downloaded shapefiles from here:
> ftp://ftp2.census.gov/geo/tiger/TIGER2014/COUNTY/.
>
> I obtain the FIPS codes from the shapefiles and order them using:
>
> shapes_fips <- shapes$GEOID
> > shapes_fips <- as.data.table(shapes_fips)
> > setnames(shapes_fips, "shapes_fips", "FIPS")
> > shapes_fips <- shapes_fips[with(shapes_fips, order(FIPS)), ]
> > shapes_fips$FIPS <- as.character(shapes_fips$FIPS)
>
>
> Then I merge the FIPS codes with my original dataset using:
>
> >
> > merged_data <- merge(shapes_fips,max_change,by="FIPS",all.X=T, all.y=T)
> > merged_data <- as.data.table(merged_data)
>
>
> Which looks like this:
>
> structure(list(FIPS = c("01001", "01003", "01005", "01007", "01009",
> > "01011"), pred_hist = c(5.68493780563595e-06, 5.87686839563543e-06,
> > 5.68493780563595e-06, 5.84476370329784e-06, 5.89156133294344e-06,
> > 5.68493780563595e-06), pred_sim = c(5.60128903156804e-06,
> > 5.82369276823497e-06,
> > 5.60128903156804e-06, 5.75205304048323e-06, 5.80322399836766e-06,
> > 5.60128903156804e-06), change = c(-1.47141054005866, -0.904829303986895,
> > -1.47141054005866, -1.58621746782168, -1.49938750670105,
> -1.47141054005866
> > )), .Names = c("FIPS", "pred_hist", "pred_sim", "change"), sorted =
> > "FIPS", class = c("data.table",
> > "data.frame"), row.names = c(NA, -6L), .internal.selfref = <pointer:
> > 0x0000000000110788>)
>
>
> But when I try to merged data back to the SpatialPolygonsDataFrame called
> shapes, I get the following error:
>
> shapes$change <- merged_data$change
>
> Error in `[[<-.data.frame`(`*tmp*`, name, value = c(-1.47141054005866,  :
> >   replacement has 3109 rows, data has 3233
>
>
>  Apologies for the messy example, what am I doing wrong? Any help will be
> greatly appreciated. Thank you!
>
> Sincerely,
>
> Shouro
>
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>
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