All Questions
28
questions
0
votes
1
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74
views
I need spatial polygons representing the land and sea in a world map and then convert them to a dataframe
I need a world map in R that can be transformed into polygons of land to be able to calculate distances through sea from one point to another and going around land/polygons. These polygons need to be ...
1
vote
1
answer
50
views
Mean of geospatial distance between two datasets of different lengths
I want to compute the mean distance between all points of the toy1 dataset with the closest point of the toy2 dataset.
So for each point of the toy1 dataset, I want to find the closest point among the ...
- 198
1
vote
0
answers
72
views
Inconsistent results when matching closest lat/long points in r using sf and st_distance()
I have a large dataset where each row is a station. I need to find the closest station within each year but where a different type of equipment was used. I then want to either combine these rows into ...
- 33
1
vote
2
answers
673
views
Distance between pairs of coordinastes (UTM) in km with R
I have a dataframe with 2 pairs of UTM (32N) coordinates and I need to compute the differences in km between each of them, from origin to destination.
I'm trying with sf library, using "...
- 93
1
vote
1
answer
226
views
Distance between points along path in R
I want to compute distance between nodes along a path (network).
I have two shapefiles.
One is a point layer representing train stations:
train_station <- structure(list(geometry = structure(list(...
1
vote
1
answer
568
views
Grouping polygons and neighbours based on distance criteria
I would like to group polygons together based on a distance criteria:
Any polygon within a certain distance (1200 metres or less) of an origin polygon are grouped together
If other polygons are ...
- 1,237
0
votes
0
answers
253
views
How to get the shortest line between two polygons in R
I'm using st_distance() in the R package sf to compute the distance between two polygons. I'd like to also get the shortest line between the polygons, i.e. the line along which the distance is ...
0
votes
1
answer
475
views
Nearest adjacent polygon, distance and closest point to other polygons
I have multiple polygons in a dataset and I would like to:
Identify the nearest polygon to each polygon and what the distance between them is
Calculate the coordinates of where the nearest parts of ...
- 1,237
1
vote
1
answer
404
views
Calculate nearest point coordinate and distance by differing years between two data frames using sf
For each observation in a data frame in a year I am trying to finde the nearest observation in another data frame one year prior and calculate their distance.
Following this (https://gis.stackexchange....
- 254
1
vote
1
answer
360
views
How to loop st_distance through list
My goal is to apply the st_distance function to a very large data frame,
yet because the data frame concerns multiple individuals, I split it using the purrr package and split function.
I have seen ...
- 148
2
votes
1
answer
1k
views
How to solve this problem with the st_distance function from sf giving an error when inspecting the data?
I have this data:
df <- data.frame (pc_home = c(1042, 2052, NA, 4021, 9423, NA, 1502, 5942),
pc_work = c(NA, 2105, NA, 4352, 8984, NA, 1495, 6050),
centroid_home ...
- 493
1
vote
0
answers
706
views
Minimal distance between random points in r
I am trying to make a random sample of points on a shape layer composed of multipolygons. I use for that the st_sample function of package sf. I get my sample with the desired number of points but I ...
- 37
2
votes
1
answer
734
views
Finding coordinates from heading and distance in R
I want to get the coordinates of new points, preferably using the sf package, when the inital positions and the distance and heading traveled is known.
Consider this; we have three points (pts), with ...
- 1,008
0
votes
1
answer
346
views
Calculating distance between consecutive projected coordinates within individuals (adding distance column?)
I have a movement dataset with different individuals and projected coordinates. The coordinates were projected into UTM using the following code:
coordinates(data) = ~x+y #turns data into spatial data ...
- 451
1
vote
1
answer
373
views
st_distance -How to visualise the distance between different variables in a large spatial data set
I am very new to spatial analysis in R, been learning as much as i can but hit a road block.
Objectives:
To visualise a 15000 sites (across England) data set spatially - Done
To measure the distance ...
- 13