Motivation
I have some data describing the shape of cities in Mexico and wish to overlay these on a map of the country (taken from maps through ggplot2::map_data()). While I managed to a graph, I cannot wrap my head around why my first attempt failed.
I hoped someone could explain why the first call fails.
The example below should provide sufficient context to reproduce the error.
Please note that the maps library is required to run this chunk.
Reprex
Unfortunately as a new user I can only add one embedded content to the post. I manually edited the reprex to provide links instead.
Libraries and a small extract of the data I am working with
library(ggplot2)
library(dplyr)
#>
#> Attachement du package : 'dplyr'
#> Les objets suivants sont masqués depuis 'package:stats':
#>
#> filter, lag
#> Les objets suivants sont masqués depuis 'package:base':
#>
#> intersect, setdiff, setequal, union
sample_tbl <- dplyr::tribble(
~x, ~y, ~fid,
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-98.32531, 19.11816, 177,
-98.31923, 19.10163, 177,
-98.3089, 19.10163, 177,
-98.30586, 19.09337, 177,
-98.2852, 19.09337, 177,
-98.28823, 19.10163, 177,
-98.2779, 19.10163, 177,
-98.29311, 19.14296, 177
)
# Small extract of the data to plot
Attempt 1-A, no fill
sample_tbl %>%
ggplot2::ggplot(ggplot2::aes(x, y, group = fid)) +
ggplot2::geom_polygon() +
ggplot2::geom_path(
ggplot2::aes(long, lat, group = group),
ggplot2::map_data("world", "mexico")
) +
ggplot2::coord_fixed() +
ggplot2::scale_fill_viridis_c(option = "magma") +
ggplot2::guides(fill = "none") +
ggplot2::theme_void()
It is not striking because we are currently working with a sample but using the full set, it can be hard to distinguish city borders. To alleviate this concern I simply map the city identifiers (already used to define which points are part of the same polygon) to the fill aesthetics.
Attempt 1-B, fill
sample_tbl %>%
ggplot2::ggplot(ggplot2::aes(x, y, group = fid, fill = fid)) +
ggplot2::geom_polygon() +
ggplot2::geom_path(
ggplot2::aes(long, lat, group = group),
ggplot2::map_data("world", "mexico")
) +
ggplot2::coord_fixed() +
ggplot2::scale_fill_viridis_c(option = "magma") +
ggplot2::guides(fill = "none") +
ggplot2::theme_void()
#> Error in FUN(X[[i]], ...): objet 'fid' introuvable
This produces the error I do not understand as fid was already used in 1-A.
Attempt 2
By simply inversing the order the calls (country borders first) we can produce a graph.
ggplot2::map_data("world", "mexico") %>%
ggplot2::ggplot(ggplot2::aes(long, lat, group = group)) +
ggplot2::geom_path() +
ggplot2::geom_polygon(
ggplot2::aes(x, y, group = fid, fill = fid),
sample_tbl
) +
ggplot2::coord_fixed() +
ggplot2::scale_fill_viridis_c(option = "magma", end = 0.75) +
ggplot2::guides(fill = "none") +
ggplot2::theme_void()
Created on 2022-03-25 by the reprex package (v2.0.1)
Session info
sessioninfo::session_info()
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I am really unsure as to why 1-B produces an error whereas 2 runs correctly.
Thank you !