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Questions - terra

Polygons area is less than polygons using terra in R

I have a set of polygons saved as SpatVector, I'm trying to calculate the area of the polygons with the terra package. The issue is the number of areas is less than the polygons. This behaviour is unp...
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ahmathelte

r

polygon

terra

Votes: 0

Answers: 1

Latest Answer

It is hard to say why this happens, as I do not get that error, so perhaps it is related to using different versions of packages (and for sf, perhaps the GEOS library). Either way, I think it will wor...
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Robert Hijmans

Turning a SpatRaster object to a SpatialGridDataFrame

How to convert a SpatRaster object (from the terra package) to a SpatialGridDataFrame object? r <- terra::rast(matrix(runif(10), 5, 5)) as(r, "SpatialGridDataFrame") > Error in as(r, ...
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Junitar

r

terra

Votes: 0

Answers: 1

Latest Answer

You have to go through raster: library(terra) library(raster) x <- terra::rast(matrix(runif(25), 5, 5)) y <- raster(x) z <- as(y, "SpatialGridDataFrame")
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Robert Hijmans

How can I subset a raster by conditional statement in R using `terra`?

I am trying to plot only certain values from a categorical land cover raster I am working with. I have loaded it in to R using the terra package and it plots fine. However, since the original data did...
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apple

r

raster

terra

Votes: 0

Answers: 2

Latest Answer

You can use cats to find out which values correspond to which categories. library(terra) set.seed(0) r <- rast(nrows=10, ncols=10) values(r) <- sample(3, ncell(r), replace=TRUE) - 1 cls <- c(...
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Robert Hijmans

`sp::over()` equivalent in `terra`

Is there an equivalent of sp::over() in package terra? To get a data frame showing which geometries of a SpatVector overlay which geometries of another SpatVector -- like this, but using only terra: #...
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AMBarbosa

r

spatial

terra

Votes: 0

Answers: 2

Latest Answer

Your example data library(terra) lux <- vect(system.file("ex/lux.shp", package="terra")) pts <- vect(cbind(c(5.8, 6, 6.2), c(49.85, 49.5, 49.6)), crs = crs(lux)) You can use...
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Robert Hijmans

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