Making Choropleth Map.

valuemap

The goal of valuemap is to save data analysts’ efforts & time with pre-set sf polygon visualization.
You can also visualize with plain data.frame based on H3 addresses

Installation

To install the stable version from CRAN, simply run the following from an R console:

install.packages('valuemap')

To install the latest development builds directly from GitHub, run this instead:

if (!require('remotes')) install.packages('remotes')
remotes::install_github('Curycu/valuemap')

How to Use?

Your data must have two columns named as name & value

• name column is used for mouse over popup information
• value column is used for mouse over popup information & color polygons & display center number of polygons

library(valuemap)

data('seoul')
seoul
#> Simple feature collection with 25 features and 2 fields
#> Geometry type: POLYGON
#> Dimension:     XY
#> Bounding box:  xmin: 126.7643 ymin: 37.42901 xmax: 127.1836 ymax: 37.70108
#> Geodetic CRS:  WGS 84
#> # A tibble: 25 x 3
#>    name  value                                                          geometry
#>    <chr> <int>                                            <POLYGON [arc_degree]>
#>  1 1111     17 ((126.969 37.56819, 126.968 37.56718, 126.9679 37.5671, 126.9673~
#>  2 1114     15 ((127.0163 37.55301, 127.0132 37.54994, 127.0117 37.54851, 127.0~
#>  3 1117     16 ((126.9825 37.51351, 126.9801 37.51212, 126.9756 37.5123, 126.96~
#>  4 1120     17 ((127.0628 37.54019, 127.0566 37.5291, 127.0491 37.53255, 127.04~
#>  5 1121     15 ((127.0923 37.52679, 127.0904 37.526, 127.0885 37.52549, 127.087~
#>  6 1123     14 ((127.0786 37.57186, 127.0782 37.57094, 127.0778 37.57008, 127.0~
#>  7 1126     16 ((127.0958 37.5711, 127.0957 37.5711, 127.0955 37.57105, 127.095~
#>  8 1129     20 ((127.0245 37.5792, 127.0232 37.57804, 127.0225 37.5781, 127.018~
#>  9 1130     13 ((127.022 37.61229, 127.0207 37.6125, 127.0206 37.61252, 127.020~
#> 10 1132     14 ((127.0464 37.63916, 127.0455 37.63783, 127.0453 37.63749, 127.0~
#> # ... with 15 more rows

Example 1

Quick & easy visualization of sf polygons with value

valuemap(seoul)

Example 2

Emphasize greater or equal to 20 polygons (>= 20, < 20 : two level only)

valuemap(seoul, legend.cut=c(20))

Example 3

Visualize without center number on polygons

valuemap(seoul, legend.cut=c(15,17,20), show.text=FALSE)

Example 4

Change color palette & center number on polygons text color, format & change background map

valuemap(
  seoul, map=leaflet::providers$Stamen.Toner, palette='YlOrRd',
  text.color='blue', text.format=function(x) paste(x,'EA')
)

Example 5

You can visualize based on plain data.frame with h3 address

data('seoul_h3')
seoul_h3
#> # A tibble: 1,329 x 2
#>    name            value
#>    <chr>           <dbl>
#>  1 8830e03449fffff     4
#>  2 8830e03453fffff     3
#>  3 8830e0345bfffff     3
#>  4 8830e034c9fffff     3
#>  5 8830e03601fffff     4
#>  6 8830e03603fffff     4
#>  7 8830e03605fffff     4
#>  8 8830e03607fffff     4
#>  9 8830e03609fffff     3
#> 10 8830e0360bfffff     4
#> # ... with 1,319 more rows

valuemap_h3(seoul_h3, legend.cut=1:6, show.text=FALSE)