Advertisements Question I have a dataframe df which contains cartesian coordinates of a hypothetical road. I want to find the length of the road. Following is a plot: library(ggplot2) ggplot(df) + geom_point(aes(x, y2)) My attempt to find the length: I tried converting df to an sf object and then find length, but it didn’t work… Read More Find the length of a road in R
Advertisements I would like to plot a map of France using geom_sf and then add a layer to map Germany. Here’s what I did library(ggplot2) library(sf) library(raster) fr_sf = st_as_sf(getData("GADM",country="FRA",level=1)) de_sf = st_as_sf(getData("GADM",country="DEU",level=0)) ggplot(fr_sf) + geom_sf(fill = "gray90") + geom_sf(de_sf, fill = "gray90") but I get an error mapping` must be created by `aes() I… Read More R: Inserting a geom_sf layer on top of another geom_sf layer
Advertisements I’m creating a booking reference for the user to download after successfully making a booking. It looks like this in the browser: However, after using html2canvas to get a screenshot of the component in React, I get this: I suspect the issue has to do with the fact that the static map’s use is… Read More html2canvas failing to capture Google static map
Advertisements Some of my code which previously yielded a warning message is now giving an error. Here is an example: library(sf) states <- tigris::states(cb = T) %>% select(state = NAME) %>% filter(state == "Wisconsin") wi.counties <- tigris::counties(state = "WI", cb = T) %>% select(county = NAME) st_crs(states) == st_crs(wi.counties) [1] TRUE intersection <- st_intersection(states, wi.counties)… Read More {{sf}} commands now giving "Error: (converted from warning) message
Advertisements I’m getting more familiar with sf objects for spatial data in R, but cannot figure out this simple aspect — how do I reorder my sf object by a column with values that I specify. Take this example library(sf) points <- data.frame(long = c(-50, -50, 50, 50, -50, -100, -100, 100, 100, -100), lat… Read More Reorder sf object by column
Advertisements Let me start by saying I’ve seen the other thread on a similar question, and even after replicating the nc maps problem they use, I’m still running into a problem with my own code. I’m trying to create a map with 50km square grids imposed over specific countries. I can generate a map with… Read More st_make_grid() not using correct map units