Questions tagged [sp]
R package with classes and methods to create and manipulate spatial data
278
questions
0
votes
1answer
43 views
Raster subset error in R: “Error: object of type 'S4' is not subsettable”
I am running this code in R:
country_template <- raster()
dimensions <- extent(124000, 463000, 2953600, 3127600)
country_template <- setExtent(country_template, dimensions)
res(...
1
vote
1answer
33 views
Creating raster stack from two raster layers
I have two raster layers that I would like to create a raster stack from. They are currently in different extents. One is a DEM layer and the other is a raster of an individual's home range. This is ...
1
vote
2answers
39 views
R raster package unable to properly convert sp or sf feature to raster
I had previous functioning R code that took an interpolated dataset of class sf, and turned it into a raster. I then preformed an average of raster values over specific overlayed polygons. It seems ...
1
vote
2answers
24 views
Preserving IDs when using gCentroid to find centroids of multiple polygons in R
This seems like it should be simple. I have multiple polygons contained in one shapefile, and I am using the gCentroid() function from rgeos to create a bunch of centroid points. The function has an ...
0
votes
0answers
24 views
Getting a rasterized object from irregular lat and long data
I have a dataframe (I've named it ozone2raster) with latitude and longitude points, and values for ozone concentration that I want to use for making a rasterized map. The dimensions of this dataframe ...
1
vote
1answer
43 views
Error in writeOGR when trying to export spatial polygons as shapefile in R
I am trying to export polygons that i have created for home range data but when i go to export them get this error message:
Error in writeOGR(colkud95[1, ], ".", "colonyhomerange", ...
1
vote
1answer
26 views
Converting a SpatialPointsDataFrame into km units from m, in R
I read in a UTM shapefile to R using readOGR. I want to use the resulting SpatialPointsDataFrame to build a mesh in the INLA package, but I've been told that to help with numerical stability, I should ...
0
votes
1answer
43 views
Determining off to add scale bar and north arrow in spplot
I have a spplot in which I want to add north arrow and scale bar.
bbox(dis) # dis is my shapefile, an sp object
min max
x -285706.6 1492871
y 2620690.6 4120742
I want to attach the ...
1
vote
2answers
37 views
Change projection of list of rasters in R
I am handed down some RData that contain a list of of raster stacks. The file structure is pretty challenging to manipulate. After doing load(), the data looks like this:
[[1]]
class : ...
0
votes
2answers
25 views
Trying to apply inlabru:::bru_fill_missing to a SpatialPointsDataFrame to fill in NAs
I'm struggling with a function from the inlabru R package, which could help me fill in the NAs in my data.
According to the helpfile, I need:
bru_fill_missing(
data,
where,
values)
data is a ...
4
votes
1answer
68 views
Fixing polygon with incorrectly defined hole in R
I've been given this polygon as a SpatialPolygons object from the sp package.
It looks like there is a problem with how this was created, there is an unwanted line connecting the hole to the outer ...
5
votes
1answer
63 views
Unexpected buffer output
Using both R and QGIS I got unexpected output from the buffer function. I'm wondering if it has something to do with my coordinate reference system, USA Contiguous Albers Equal Area Conic, because the ...
0
votes
1answer
45 views
R packge sp to sf QGIS 3.14
I have several scripts written in R language with package "sp" for Qgis. However I am stuck in the old versions (2.18) because whenever I use this same package in current versions 3.14 the ...
0
votes
0answers
83 views
Interpolation of point data in R
I want to interpolate some daily point data. The ultimate goal is to receive something like a heat map/IDW map with some interpolation statistics like kriging/IDW.
My data:
Nr. : coordinates : ...
0
votes
0answers
13 views
Trying to Rotate Raster Map to Route Up and add Route
Firstly apologies as this is likely a simple answer but I'm new to GIS in R and the associated packages. This is a hobby project and I'm treating it as a learning experience. Anyway what I am trying ...
1
vote
1answer
28 views
Stats for forest cover change over 10 years in R
I am rather new to GIS and I don't know how to perform the following operation: [ R programming language]
I am developing a project evaluating forest cover change over 10 years (2010-2020) for a ...
0
votes
2answers
52 views
Raster extent based on SpatialPolygonsDataFrame generating incorrect extent
I'm trying to rasterize data from Berlin's average price per parcel data. I've downloaded the shapefile from their data portal using an API with a function that generates an sf object, and then ...
0
votes
1answer
18 views
Plot points in spastat ppp object
I am new to spatstat package and I am trying to make a point patten map with a shape file and some case points. I was able to plot the shape file plot but I just don't know how to make the points on ...
2
votes
3answers
170 views
Creating smallest-circle covering polygon using R with sf
How can I create the smallest-possible circle which covers a polygon geometry using the sf (preferred) or sp packages in R?
One reprex using GADM data:
# Load packages
library(sf)
# Load Nigeria ...
3
votes
1answer
378 views
r sp::CRS() returns NA
I just updated R (from 4.0.2 to 4.0.3) and all my R packages (previously updated about a month ago), and got an error in a previously working workflow on raster objects. It seems that it comes from ...
0
votes
1answer
30 views
Applying function to each element of SpatialLinesDataFrame
How do I apply functions to each element of a SpatialLinesDataFrame, in particular using other data also stored as an attribute (e.g. coordinates or elevation per line vertex)?
I've a number of ...
0
votes
1answer
52 views
Navigating an Object of class 'SpatialPolygonsDataFrame' to filter on Polygon Area
I have an Object of class 'SpatialPolygonsDataFrame' with the structure shown below.
What's the secret to getting to the @area slot? Ultimately, I'm trying to filter this file so that I'm only left ...
0
votes
0answers
26 views
Some polygons failing to fill with color
I have several Spatial Polygon Data Frames I am adding successively to a plot in R 4.0.2. The polygons represent US States, National Forests, National Parks, and wildfire perimeters. While it probably ...
0
votes
0answers
36 views
How to tile and mosaic spatial vector data in R?
Processing large vector data requires a way to tile the input data and mosaic the output.
The following example only targets the tile creation and final mosaic step. Tiling the data has the reason ...
0
votes
1answer
126 views
Finding overlapping polygons of two Spatial Polygon Data Frames using R
I am new to GIS and GIS in R. I have two Spatial Polygon Data Frames (spdf), one contains the marine ecoregions of the world (MEOW), the other one contains Exclusive Economic Zones (EEZ) of the world. ...
0
votes
0answers
16 views
ggplot gridded SpatialPolygonsDataFrame producing odd triangles and subsetting data based on point data
I have cross posted this on SO.
Using the code below I can plot the following:
This code is adapted from here
As you can see there are few issues with the plot. I am struggling to
Remove weird ...
1
vote
1answer
27 views
Locating SpatialPoints on SpatialPixels using R
I have met this frustrating problem while using R doing some GIS operation.
The problem is, I want to locate some spatial points (SpatialPointsDataFrame) on geographical grids (SpatialPixelsDataFrame)....
3
votes
1answer
104 views
Save Spatial Pixel Data Frame
I have met a small yet puzzling problem about saving and reading Spatial Pixel Data Frame.
I created a raster with over 10 million grids (resolution = 25000).
adm0 <- readOGR(dsn = path.expand(&...
1
vote
1answer
23 views
Use mapview in function to open viewer, but also do other things afterwards
The question may sound a little strange, but what I want to do is the following:
library(sp)
library(sf)
data(meuse)
meuse = st_as_sf(meuse, coords = c("x", "y"))
plotit = ...
0
votes
1answer
484 views
Problems with specifiying TM_fill when creating a map in R with TM_maps
For my research I am visualizing plastic contents in segments of water.
After creating my segment (online, polygons in KML-file) I jointed it with my table with fieldworkdata with plastics per segment....
0
votes
0answers
48 views
Issues fitting Variogram Model in R
I have taken a shapefile from Open NYC Data and performed the following method. My end goal is to predict Taxi trip_duration at various points across the city of NYC in March at given time segments. I ...
0
votes
0answers
9 views
How to choose cell size for grid points to fill polygons in R?
I have a shapefile consisting of hundreds of polygons depicting building footprints in a city. I want to fill these polygons with grid points. I am doing this by making a grid of points and then ...
0
votes
0answers
90 views
Projection issue causing clipping issue in R, different proj4 strings
I am trying to clip a grid of points to a vector polygon layer in R, but am encountering an odd error I can't figure out. The goal is to get a new layer that has the grid points, but only as clusters ...
3
votes
1answer
229 views
Combining two shapefiles using common attribute
I have two shapefiles "sf1" and "sf2" for same area.
"sf1" is population data for year 2015 and has 6 variables.
"sf2" is population data for year 2010 and ...
2
votes
1answer
169 views
Reproject using WKT for just the horizontal CRS
I'm trying to reproject LiDAR point clouds from California zone 2 (ftUS) using spTransform from sp R package to a metric CRS like EPSG 3857 (initial post here) and got non finite transformation ...
1
vote
2answers
146 views
“non finite transformation detected” using sp R
This is a part of a broader question already posted (Non finite transformation detected - lidR spTransform) but I am creating a new question for the sp related part of that.
I'm trying to reproject ...
1
vote
1answer
233 views
Non finite transformation detected - lidR spTransform
I would like to re project the following laz file using lidR and spTransform from sp.
The EPSG code is not defined but it seems to me that the CRS string is complete:
tmp_laz <- readLAS("./...
0
votes
0answers
18 views
Are these sp files equal in terms of proj4string? Can I do some transformation of the proj4string?
summary(SCat_sp_E6)
Object of class SpatialPolygonsDataFrame
Coordinates:
min max
x -74.095072 -74.018988
y 4.647323 4.832934
Is projected: FALSE
proj4string :
[+proj=longlat +...
0
votes
1answer
54 views
R raster::shapefile() seems to overwrite ID when writing SpatialLinesDataFrame
I am creating a "nested" SpatialLinesDataFrame like so:
lines.list <- list()
id.vect <- c("A", "B", "C")
for (lines.index in 1:3) {
line.list <- ...
0
votes
1answer
39 views
Include ID in an spatial weight matrix R
I have a data frame like this one:
dataSp <- read.table( text = '
ID LATITUDE LONGITUDE
A -85 134
B 34 2
C 42 3
D 45 ...
2
votes
0answers
56 views
How to create a hexbin polygon over a world map with a geom_sf object in R?
I have global data with over 180,000 data points. For every pair of coordinates I have a value, and many times I have multiple values at the same coordinates (see example of the dataframe df). I want ...
8
votes
4answers
702 views
sp::proj4string equivalent in the PROJ6 framework?
I am confused about the shift from PROJ4 to PROJ6 in the (relatively) recent versions of the spatial packages of R (and gdal for that matter). I used to use sp::proj4string() to get the projection ...
1
vote
0answers
25 views
R statspat package (or similar pkg) and convert back to spatial objects
I've been testing the waters and doing some basic overview on the statspat package. This is a complex package and would likely require some serious effort to jump in and then get familiar with the ...
7
votes
1answer
2k views
How should I handle CRS properly after the major change in PROJ library?
As explained here, the PROJ library has changed a lot and one should stop using proj.4 strings. To me it is not clear, what I should do instead. This answer explains, how I could deal with the problem ...
2
votes
1answer
56 views
Extract() increases sum of values?
I am using the Landscan grid to calculate the number people within Vietnamese communes. First I masked the data with the GADM boundary. Then I used extract() to calculate the population by commune and ...
1
vote
1answer
74 views
Understanding error in changing projection of SpatialPolygon (R)
I am encountering an error I don't understand. I want to change the projection of a SpatialPolygonsDataFrame from +longlat to Mollweide or Robinson. For this I am trying to use spTransform(), but it ...
1
vote
1answer
266 views
Issue with osrmIsochrone function in R
I have been using osrm package for a while and didn't ever come across this kind of issue before. It looks so weird and I have been trying to update package and reinstall R as well. But nothing is ...
4
votes
1answer
794 views
Why does updating `rgdal` package in R change output of `sp::CRS` (+towgs84=0,0,0)?
I am not a GIS expert, and this change caused quite some errors in our analysis. So my question is, why this was changed: From rgdal 1.4.8 to 1.5.16, the +towgs84=0,0,0 disappeard in the output of sp::...
2
votes
1answer
70 views
Spatial neighbors in ggplot2
I'm trying to make a space plot with ggplot() as indicated here, but I'm having trouble using the nb2lines() function.
.shp files are here
Error in if (!is.na(projargs) && !nzchar(projargs)) ...
1
vote
1answer
31 views
Unable to process multiple polygons using SpatialPolygons object
I have a list with 4 objects, each object is a data frame. The data frame is the coordinate matrix of each polygon. I would like calculate the total area of the 4 polygons and then draw the voronoi ...
