Questions tagged [sp]

R package with classes and methods to create and manipulate spatial data

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30 views

Remove polygons having less than 4 coordinates in R

I have a multiPolygon shapefile of buildings in a particular city. I read it in with readOGR and and transform it to my desired planar projection with the following code: buildings_data<-readOGR("...
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29 views

How to correct border between 2 polygons in R? [duplicate]

What algorithm to use to correct (average) the borderline between 2 polygons? All I know is that they have their own borderlines very close to each other. Sometimes they may overlap, otherwise not. ...
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23 views

How to get middle line of buffered shape in R? [closed]

Just simply, what function to use to get the middle line of such shape? This is a product of sf::st_buffer( ) function and these are 2 polygons, smaller and larger. How to get average one (in the ...
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50 views

Areas of imported features in Google Earth Engine

I originally wanted to ask the following question: "In the FeaturesCollection r_features, why do the two features have such different areas? They should have the same areas because they are both ...
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1answer
37 views

CRS validity and PROJ versions

I'm not sure where the right place to raise this is, so: The PROJ strings for EPSG codes 4151 and 4283 are identical: +proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs which is a hassle ...
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21 views

Finding datasets embedded in R GISTools package?

How can I find the embedded datasets in R package GISTools? I can find examples of datasets (Georgia, Newhaven etc.), but I cannot see exactly which datasets are available.
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14 views

Error: trying to get slot “polygons” from an object (class “data.frame”) that is not an S4 object

I am trying to join .csv file data to shape file data using @data slot. I am getting error "trying to get slot "polygons" from an object (class "data.frame") that is not an S4 object " Here is my ...
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12 views

Copying polygons from lists of polygons to one SpatialPolygon list in R?

I do not know how to regroup polygons from SpatialPolygons list in the following manner: I have object rtu: > rtu class : SpatialPolygons features : 81 extent : 450685, 458760, ...
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23 views

Easy way to plot separate groups of SpatialPolygons in R

I have SpatialPolygons grouped by 81 polygons and in each there are some other Polygons I'd like to plot them group by group but have little trouble with it. > rtu_spl class : ...
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1answer
42 views

After I give kring command, this error comes up: data item in gstat object and newdata have different coordinate reference systems

> library(gstat) > library(readxl) > library(sp) > library(rgdal) #2013(FATALITIES) data <- read.csv("C:/Users/sbs/Desktop/Study/RA/Accident analysis/New folder/Iowa total crashes ...
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1answer
26 views

How to build polygons from buffered points and merge overlapping ones using R?

I have a sample of 3 groups of points which are similarly spread within their groups. > pts x y [1,] 453067.5 364073.5 [2,] 453066.5 364072.5 [3,] 453068.5 364072.5 [4,] ...
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1answer
44 views

sp::over vs sf::st_intersection in r

I was wondering why sf::st_intersection() takes too much time, in comparison with sp::over(); I use sf for pretty much all of my geospatial workflows (I was used to sp as well), and more and more ...
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1answer
25 views

How to create circular polygon and add it to shapefile as a layer?

I have such data of points which could be stored with their radii. cdf = rbind(matrix(c(100, 200, 10), ncol = 3), matrix(c(400, 300, 20), ncol = 3)) di = c("1", "2") spcs <- list() for (c in 1:...
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1answer
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How to overcome missing of “sp::Point” to create points layer in shapefile?

I can produce Polygon layer from matrix in following way: pols <- lapply(cdf, Polygon) pls <- lapply(seq_along(pols), function(i) Polygons(list(pols[[i]]), ID = i)) sps <- ...
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1answer
34 views

Identify polygon grid in which the point belongs to?

I have a dataframe with 3 columns , which has my custom lat / long with a failure rate associated with each Lat / long head(df) Latitude Longitude Failure.rate 51.3 ...
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1answer
54 views

Subdivide raster file by polygon in R

I am trying to get a raster file of nightlights data for Brazil and subdivide/regroup it into several rasters for each state, in a list or data.frame in R I managed to download the nightlights file, ...
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7 views

Is it possible to assign values from polygons to a new layer in an existing raster in R?

I'm a bit of an R novice and looking to see if there is any way to assign values to a raster layer based upon polygons. Some background - I am working on a mining project and have a regular grid of ...
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2answers
32 views

How to save a plot to disc with tmap in R

I have made a plot with these lines mainland print(Bornhold, vp = viewport(x = 0.7, y = 0.5, width = 0.3, height = 0.2)) One is mainland and the other an island. How can I save it to one one png ...
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1answer
80 views

Extract areas with certain pixel values from raster

I have land cover data from GEE (https://developers.google.com/earth-engine/datasets/catalog/ESA_GLOBCOVER_L4_200901_200912_V2_3) for specific countries. I would like to extract the values from the ...
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1answer
38 views

The slot for “plotOrder” comes up as 1 instead of a vector with length specific to my data

My goal is to find neighbors from my SpatialPolygons object using the poly2nb() command from the sp package in R. This is my code thus far: p <- s_gis %>% select(long, lat) %>% ...
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1answer
57 views

gIntersection error: linearRing not created

I am trying to do something relatively simple but with large shapefiles. I have a shapefile of protected areas in the USA: and watershed boundaries: I want to calculate the percentage and ...
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1answer
47 views

Error coercing raster with one non-NA value to SpatialPixelsDataFrame [closed]

I'm getting a strange error when trying to convert a raster with only 1 non-NA pixel to SpatialPixelsDataFrame. r0 <- raster( matrix( 1, 1,1)) as(r0, 'SpatialPixelsDataFrame') Error in (...
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2answers
547 views

Plotting spatial points data in R?

I have some kind of noob question: how do I plot spatialpoints dataframe in R using spplot (or ggmap) based on column values? let's say we have this: library(sp) data(meuse) v <- ...
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1answer
41 views

How might one optimise geospatial operations on complex polygons, especially plots in R?

Question: I'm attempting to run some simple plots on some shapefiles with a high number of complex polygons. These aren't massive files - for the example below, the shapefile is 70mb (15872 obs), but ...
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2answers
44 views

sf polygon goes black in for loop in R

I'm making this loop, it's part of a script I'm making to illustrate a percentage in a polygon (let's say instead of a pie) but then I realized it looks good as an animation; when I start plotting, ...
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1answer
128 views

Legend color scale problem with tmap for island

Bornholm_data <- geo_RH %>% filter(KOMNAVN=="Bornholm") tm_shape(geo_RH) + tm_fill(col="Befolkning") + tm_borders() mainland <- tm_shape(mainland_data, projection = 0) + ...
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1answer
59 views

Dealing with Islands with sf objects and the tmap package [closed]

I have the bounderies for the municipalities in the "capital region" of Denmark. The acctual map looks like this: The yellow island is the fourth row in my sf object. I am trying to folllow the ...
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1answer
112 views

How to I limit the x and y axes with tmap in r

I have made this plot with the following code: library(tmap) tm_shape(RH2) + tm_fill(col="AREAL") + tm_borders() But there is a dot on the far right (an island) which I don't ...
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0answers
19 views

Error with over() ´sp ´ package in R

I have a df with spatial points that I've converted into a spatial object (dai18) and I want to select only the points that are inside a polygon (peri_A). I think my coordinate system is incorrect, ...
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1answer
46 views

Measure distance for spatialLine in R returns bad value

I have this spatialLine in R: library(sp) library(maptools) library(SDraw) library(leaflet) x <- c(153.9, 152.67072,147.9879,144.25364,135.45557,116.03998,76.92708,45.10622,37.02522,36.76888,36....
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1answer
40 views

Calculate distance between buffer and geographic points for grouped subsets (and get tally)

The data I used can be found here. After importing my data, I select a subset of points (Nest2017 in column type) to create 30 m buffers around: library(dplyr) nests<-df %>% filter(type %...
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1answer
67 views

How to create and empty SpatialLinesDataFrame in R

I need to create and SpatialLinesDataFrame with a predefined structure (9 fields). I'm performing a function over a list of shp which I want to append to this empty spatiallinesdataframe. I already ...
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0answers
71 views

over function in R not working [closed]

I am trying to find the number of pubs for each London LSOA. I do this with London's LSOA boundaries shapefile which I imported as a SpatialPolygonsDataFrame and a SpatialPointsDataFrame of pubs ...
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1answer
180 views

Rearrange plotorder of SpatialPolygonsDataframe

I have a SpatialPolygonDataframe (loaded with readOGR) I want to plot in either tmap or leaflet. A lot of the polygons are overlapping, and the smaller polygons are completely covered by larger ...
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1answer
148 views

Simplifying a SpatialPointsDataFrame in ggplot world

I've been working on a map showing lines running across Europe. Each line is coming from a GPX file, parsed in like so: spdf <- readOGR("data/file.gpx", layer = "track_points") Now, if I plot the ...
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1answer
220 views

Legend Key for discrete values in spplot

I have a shapefile with various attributes. I want to plot the shapefile using `spplot'. I first read the shapefile A <- readOGR('myshapefile.shp') I am using the following command: p <- ...
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1answer
72 views

spplot R and order of panels for Lattice plots

I have a shapefile with various attributes. I want to plot the shapefile using `spplot'. I first read the shapefile A <- readOGR('myshapefile.shp') I am using the following command: p <- ...
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0answers
32 views

Divide irregularly shaped polygon into 3 equal parts

I have a polygon object of a transect line that I would like to divide into 3 equal parts that are one-after-the-other along the transect line. So far I have only been able to slice the polygon ...
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2answers
222 views

Extracting non-spatial data from imported KML file using R?

I have a KML file which was created using Google's My Maps. The original file can be downloaded here: Google My Maps Using R, I can import this using the "readOGR" function of the rgdal library ...
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1answer
331 views

Setting fill to a variable based on data within SpatialPolygonsDataFrame?

I'm currently on the cusp of getting done what I want to get done - but having a slight problem with referring to my data from within R's sp SpatialPolygonDataFrame object. The issue is how ggplot2 ...
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1answer
55 views

Using R to create a choropleth generated from lat/lon lists - with data generated internally

a friend referred me here as opposed to the regular Stack Overflow site, as this community maybe better able to help! My issue is largely with the syntax and framework of ggmap,ggplot, and the sp ...
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1answer
186 views

Connect points from two SpatialPointsDataFrames in R, considering the closest distance

I have two SpatialPointsDataFrames. In SpatialPointsDataFrame one (dat1) I have three points (A, B and C). In SpatialPointsDataFrame two (dat2), I have eight points with temperature measurements. I ...
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0answers
23 views

Clipping polygons to existing plotting area

I have an existing plotting area onto which I want to add some polygons. In order to be sure the polygons' labels are displayed within the plotting area, I'd like to clip the polygons to this area so ...
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0answers
33 views

Swapping raster bands on disk efficiently using R

I have two raster files, each with RGB bands and an alpha layer. I would simply like to swap one of the raster's alpha bands for another, but to do so as efficiently as possible (these are very big ...
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1answer
100 views

Generating lines from coordinate file using R?

I have got an excel sheet with X and Y coordinates, actually Y is constant, since it is a straight line. I want a Shapefile with as many features as distance between points. I only get one line from ...
3
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1answer
135 views

sf appears to truncate a projection string

Curious how folks deal with this type of thing where sf appears to trim the spatial projection: library(sf) library(sp) nc <- st_read(system.file("shape/nc.shp", package="sf"), quiet = TRUE) ...
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1answer
365 views

R spTransform polygon that crosses dateline

I have created polygons with CRS = UTM (see here), which I need to transform to latitude/longitude. Some of my polygons cross the dateline, which causes the transformation to create a polygon that ...
2
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1answer
100 views

How can / should sf spatial objects be translated (i.e. moved within same projection)?

Big fan of the sf (and previously, sp) spatial packages in R. I see spTransform and st_transform as methods to reproject a spatial object into a new space. However, I have a case where I have a ...
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1answer
299 views

Mapping data: error in classIntervals: var is not numeric

When executing the 'classIntervals' command I got the error while mapping data from Eurostat. library(rgdal) library(RColorBrewer) library(sp) library(GISTools) library(classInt) library(maptools) ...
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2answers
755 views

Creating lines between pairs of points

I have a sf dataframe table_sf as: Classes ‘sf’, ‘tbl_df’, ‘tbl’ and 'data.frame': 12251 obs. of 5 variables: $ ID : int 1 2 3 4 5 6 7 8 9 10 ... $ NOMBRE : chr "AL011900" "AL011900" "...