[R] Plot by FIPS Code using Shapefiles

[Shouro Dasgupta]

Hello,

Thank you for your reply. My original data has 3109 FIPS codes. Is there a
way to merge only this data into the shapefiles? I hope I am clear.

Thank you also for the link, I am trying to do something like this:
https://gist.github.com/reubano/1281134.

Thanks again!

Sincerely,

Shouro

On Tue, May 5, 2015 at 5:21 PM, Anthony Damico <ajdamico at gmail.com> wrote:

> 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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>
>


-- 

Shouro Dasgupta
PhD Candidate | Department of Economics
Ca' Foscari University of Venezia

------------------------------

Junior Researcher | Fondazione Eni Enrico Mattei (FEEM)
Isola di San Giorgio Maggiore, 8 | 30124 Venice, Italy
Tel: +39 041 2700 436

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