Geographic Information Systems Asked by geoscience123 on July 2, 2021
Continuing a question from here: Adding tmap_icon to legend in r
The answer provided shows how to add a custom PNG image to a tmap in R, however, I now looking for a way to increase the symbol size within the tmap legend. See below:
library(tmap)
library(sf)
#> Linking to GEOS 3.8.1, GDAL 3.1.4, PROJ 6.3.1
library(tidyverse)
tdir=tempdir()
Stateshpurl= "https://www2.census.gov/geo/tiger/GENZ2018/shp/cb_2018_us_state_5m.zip"
if(file.exists(paste(tdir,"/cb_2018_us_county_5m/cb_2018_us_county_5m.shp",sep=""))==FALSE){
download.file(Stateshpurl, destfile = file.path(tdir,"State_Boundaries.zip"))
unzip(file.path(tdir,"State_Boundaries.zip"),exdir = tdir)}
US_states=read_sf(paste(tdir,"/cb_2018_us_state_5m.shp",sep=""))
US_states = st_transform(US_states, 5070)
L48 = US_states %>%
filter(STATEFP != "02") %>%
filter(STATEFP != "15") %>%
filter(STATEFP != "60") %>%
filter(STATEFP != "64") %>%
filter(STATEFP != "66") %>%
filter(STATEFP != "68") %>%
filter(STATEFP != "69") %>%
filter(STATEFP != "70") %>%
filter(STATEFP != "72") %>%
filter(STATEFP != "74") %>%
filter(STATEFP != "78")
icon_url="http://29.media.tumblr.com/tumblr_m0q2g8mhGK1qk6uvyo1_500.png"
download.file(icon_url, destfile = file.path(tdir,"Image.png"),mode = 'wb')
L48$icon = "my label"
Icon=tmap_icons(file=paste(tdir,"/Image.png",sep=""))
tm_shape(L48)+
tm_borders()+
tm_symbols(shape = "icon", shapes = Icon,
title.shape = "My icon")
Notably, the size =
argument only changes the size of the icon within the map space itself.
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