SpatRaster aggregation

Aggregate a SpatRaster to create a new SpatRaster with a lower resolution (larger cells), using the GDAL's gdal_translate utility https://gdal.org/programs/gdal_translate.html

Usage

mosaic_aggregate(mosaic, pct = 50, fun = "nearest", in_memory = TRUE)

Arguments

mosaic

SpatRaster

pct

The size as a fraction (percentage) of the input image size. Either a scalar (eg., 50), or a length-two numeric vector. In the last, different percentage reduction/expansion can be used for columns, and rows, respectively.

fun

The resampling function. Defaults to nearest, which applies the nearest neighbor (simple sampling) resampler. Other accepted values are: 'average', 'rms', 'bilinear', 'cubic', 'cubicspline', 'lanczos', and 'mode'. See Details for a detailed explanation.

in_memory

Wheter to return an 'in-memory' SpatRaster. If FALSE, the aggregated raster will be returned as an 'in-disk' object.

Value

SpatRaster

Examples

if (interactive() && requireNamespace("EBImage")) {
library(pliman)
library(terra)
r <- rast()
values(r) <- 1:ncell(r)
r2 <- mosaic_aggregate(r, pct = 10)
opar <- par(no.readonly = TRUE)
par(mfrow=c(1,2))
mosaic_plot(r)
mosaic_plot(r2)
par(opar)
}
#> terra 1.7.83
#> 
#> Attaching package: ‘terra’
#> The following object is masked from ‘package:pliman’:
#> 
#>     distance
#> The following objects are masked from ‘package:EBImage’:
#> 
#>     flip, rotate, watershed