Questions tagged [r-sf]
The motivation behind the `sf` package is to provide a complete, standardized implementation of simple features in R, with links to GDAL, GEOS and Proj.4. There is a also https://gis.stackexchange.com/ for spatial R questions.
r-sf
1,995
questions
1
vote
1
answer
98
views
Transform a dataframe with list-columns of coordinates into multiple multipolygons
I have a dataframe where every line is a list of coordinates of a neighbourhood;
t <- structure(list(lng = list(c(-43.265319264, -43.265206066, -43.265037676,
-43.264643583, -43.2645450269999, -43....
- 35
0
votes
1
answer
78
views
'unable to find an inherited method for function ‘costDistance’ for signature' error while trying to do a friction weighted connectivity analysis
The purpose
What I am trying to achieve: I am trying to calculate the friction weighted connectivity values of the polygons in a shapefile using a friction raster. The shapefiles symbolize habitats ...
0
votes
1
answer
63
views
How to preserve holes when combining contours into polygons via R?
Part of the workflow for my project requires creating contours from a raster. I am able to generate the contours using raster::rasterToContour and can convert to a polygon using the sf package in R, ...
- 15
2
votes
2
answers
114
views
Replace plot points with polygons
I am trying to create a plot where instead of using points to represent data, I use the outline of administrative boundaries.
The below code illustrates where I am up to. Just a simple ordered scatter ...
- 1,315
0
votes
1
answer
98
views
Why does apply seem to drop the CRS?
The title really sums up my question. Apply seems to drop the CRS, but other functions don't. What is the best way to calculate a geographic function on a vector of points?
library(tidyverse)
library(...
- 149
-1
votes
1
answer
63
views
Count shapefile length (line) in each polygon of another shapefile (grid)
I am trying to quantify the length of a road network, on each cell of a lattice grid. Both my road network and my lattice grid are shapefiles, a polyline and a polygon respectively.
I would like to ...
- 49
3
votes
1
answer
106
views
Error when subsetting sfc objects with explicit binary predicate
I don't understand why the last two examples in the following code chunk fail
library(sf)
#> Linking to GEOS 3.11.2, GDAL 3.7.2, PROJ 9.3.0; sf_use_s2() is TRUE
p1 <- st_sfc(st_point(c(0, 0)))
...
- 3,630
1
vote
0
answers
119
views
How do I generate the correct volume contour from a raster using sf, spatialEco, and terra?
I am interested in using R packages spatialEco and terra to generate some kernel density estimates with data of varying weights so that I can export contour shapefiles for mapping. I'm currently ...
- 15
4
votes
2
answers
104
views
reverse st_transform for real-world coordinates
I have a process that rotates specific sf objects, and this works well for rendering, both in ggplot2 and plotly.
However, in shiny apps we need to take a user's click and do something useful with it, ...
- 159k
0
votes
1
answer
73
views
Logical expressions for spatial geometry and polygon attributes
I want to subset a list of polygons based on (1) whether or not they intersect other polygons in the list in space and (2) an attribute of the polygon that describes time (e.g., when the polygon was ...
- 630
2
votes
1
answer
179
views
Same code (using R's dplyr, stringr, and sf) produces different results when using different package versions
I am trying to run the same R code using computers that different versions of packages, but in one of them the code works and in the other it produces an error.
Specifically, I downloaded files from ...
- 55
1
vote
0
answers
162
views
How to solve error message " Error in if (file == "") stop("'file' must be non-empty string") : the condition has length > 1" while saving .rds?
My code looks like that and works fine so far:
# Iterate over each row in the result
for (i in seq_along(inter2012)) {
# Extract the indices of intersecting points for the i-th polygon
indices <...
- 11
2
votes
0
answers
212
views
Insert spatial data into a duckdb table from R
I would like to insert data containing a spatial geometry into a duckdb table that contains a geometry column, but I am receiving an error.
Create the table using duckdb command line duckdb ~/duck.db
...
- 1,175
1
vote
0
answers
457
views
Installing `terra` or `sf` R package using Conda
I would like to install the terra or sf R package in a Conda environment (on a Linux HPC). The following error appears if I install it from within R:
# remotes::install_github("rspatial/terra&...
- 499
0
votes
1
answer
73
views
Problem creating dynamic Alpha Hull for multiple groups
how are you? I would like your help, please, to create alpha polygons in R for different groups. I would like these polygons to be separated by my "species" column.
I understand that the ...
