All Questions
77
questions
0
votes
1
answer
66
views
Generating polygons with a target area from points using st_buffer
I have some point geometries which I want to turn into polygons using st_buffer. For each point I have a target area that the resulting polygon should have. Here's an example using R:
library(sf)
# ...
- 2,317
0
votes
1
answer
432
views
Buffers around linestrings have weird shapes (sf in R)
Update 10.11.23
Question (1) has been resolved, but answering question (2) is still in progress.
Original Post
I am trying to create buffers around (multi)linestrings representing international land ...
- 35
3
votes
1
answer
160
views
How to subtract buffers of identical ID in R (terra)?
For a research project, I need to define treated and control areas around land parcels, located by coordinates and uniquely identified by an ID. The treated areas consist of disk-shaped buffers around ...
- 33
1
vote
1
answer
189
views
Select buffers that do not overlap
I have a dataset with amenities. I've created a buffer of 200 meters around each amenity.
m_circles <- st_buffer(m, dist = 200)
It looks like this:
How can I keep only the buffers (polygons) that ...
- 95
1
vote
0
answers
179
views
Calculate road density within buffers in R [closed]
I am running the following code to calculate road density within buffers, first I thought It was working great, but then did a few reality checks, where the code has given more than 1 as density and ...
- 11
1
vote
0
answers
178
views
Calculate distance to all polygons within a buffer/radius in R
I have 2 data sets, one with polygons and one with points. My goal is to find the distance between each point and all polygons that are within a radius of 16 km using R. The data set is very large (2 ...
- 65
1
vote
3
answers
141
views
Forest patch centroids are not located in patches using landscapemetrics in R
I am using the R package landscapemetrics to find forest patch centroids in a landscape. The given function to find patch centroids is get_centroids(). The centroids returned from get_centroids() are ...
- 444
0
votes
1
answer
105
views
Enlarging gBuffer width changes polygon shape
I am having some issues with spTransform and the gBuffer function. I basically have a polygon that I want to buffer with gBuffer (not with st_buffer for other reasons). For some reason the shapefiles ...
- 9
2
votes
1
answer
141
views
How to assign a coordinate reference system to x (buffer) datasets of x iterations in a for loop - R
My aims are 1) to create different buffer sizes around three points via a for loop, 2) to assign a coordinate system to each buffer for each iteration, and 3) to store each buffer in a list ...
- 175
1
vote
1
answer
983
views
Drawing a buffer zone on a specified point in R
I want to draw three buffer with 400mt, 800mt and 1200mt on specified map utilizing Open Street Map in R.
library(OpenStreetMap)
library(ggplot2)
library(ggforce)
lat1 <- 41.245; lat2 <- 41.26; ...
- 115
0
votes
1
answer
149
views
Buffering spatialpoints and getting raster values from overlapping polygons
I have a spatial points representing eDNA sample.
I have a raster file representing surface temperature (RST)
I want to extract the surface temperature according to the eDNA sample.
So, I decided to ...
- 41
0
votes
0
answers
184
views
How to loop through polygons and apply conditional statements in QGIS?
I am trying to perform calculations on polygon attributes that are based on counts within buffers and conditional statements and for loops. I am trying to decide if it is worth it to try working ...
0
votes
1
answer
114
views
Points within buffer with the same id
I have a buffer layer and a point layer:
buffer_gdf
ID
0 1A
1 1B
2 1C
and
point_gdf
ID
0 1A
1 1A
2 1A
3 1A
4 1A
5 1B
6 1B
7 1B
8 1B
9 1B
...
- 21
1
vote
1
answer
1k
views
Buffer points within sf data frame of mixed geometry types
I have a directory of shape-files with identical data scheme, which I like to read and combine into one layer.
Reading in:
library(sf)
library(dplyr)
# create list of file names from directory
names....
- 3,199
0
votes
2
answers
121
views
How to fill NA values orthogonally to a line raster?
I want to create a buffer for a line raster by filling the NA values orthogonally to each cell.
sample data
library(raster)
r <- raster(resolution=5)
values(r) <- 1:ncell(r)
cds <- rbind(c(-...
- 469