Hello, all,
I asked a version of this question on the R-sig-geo list, but didn't get
any response. I'm asking here in the hopes of a wider audience.
I'm trying to draw US Census map data, fetched with tigris, on top of a
base map fetched by the package OpenStreetMap. I'm hoping for the most
straight-forward solution. I made significant progress with leaflet(),
but didn't need the interactivity of the map. I just need a 2D, static
map that I can print and include in a document.
Here's some of what I've tried so far:
==========================================
library(tidyverse)
library(tigris)
options(tigris_use_cache = TRUE)
library(OpenStreetMap)
library(ggplot2)
## Get an Open Street Map:
rw_map <- openmap(nw, se,
type = "osm",
mergeTiles = TRUE) %>%
openproj(projection = "+proj=longlat +ellps=WGS84 +datum=WGS84
+no_defs")
## Get an example census map:
rw_tract <- tracts(state = "MD",
county = "Baltimore city",
year = "2020") %>%
filter(NAME == "2711.01")
## This works:
autoplot.OpenStreetMap(rw_map)
## So does this:
plot(rw_tract$geometry)
## These don't:
autoplot.OpenStreetMap(rw_map) +
geom_sf(rw_tract$geometry)
ggplot(map_data(rw_map), aes(long, lat))
ggplot(aes(x="long", y="lat")) +
geom_sf(rw_map$geometry)
=====================================================
I think my problem in part is failing to fully understand the formats of
the rw_map and rw_tract containers. rw_tract says it's a simple feature
collection, but rw_map just gives me lists of the data.
Can anyone help nudge me along in getting my rw_tract to be drawn on my
rw_map? Any advice or guidance on putting together map data from
different sources?
And an over-arching question: Is moving in this direction, with ggplot2,
the way you would recommend accomplishing this task? Is there a simpler,
more straight-forward way of doing this?
Thanks in advance for your help and efforts.
-Kevin
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