compare_spatrasters: Compare attributes of two 'SpatRaster' objects

In dieghernan/tidyterra: 'tidyverse' Methods and 'ggplot2' Helpers for 'terra' Objects

Compare attributes of two SpatRaster objects

Description

Two SpatRaster objects are compatible (in terms of combining layers) if the crs, extent and resolution are similar. In those cases you can combine the objects simply as c(x, y).

This function compares those attributes informing of the results. See Solving issues section for minimal guidance.

Usage

compare_spatrasters(x, y, digits = 6)

Arguments

x, y	SpatRaster objects
digits	Integer to set the precision for comparing the extent and the resolution.

Value

A invisible logical TRUE/FALSE indicating if the SpatRaster objects are compatible, plus an informative message flagging the issues found (if any).

terra equivalent

terra::identical()

Solving issues

• On non-equal crs, try terra::project().

• On non-equal extent try terra::resample().

• On non-equal resolution you can try terra::resample(), terra::aggregate() or terra::disagg().

See Also

terra::identical()

Other helpers: is_grouped_spatvector(), is_regular_grid(), pull_crs()

Examples

library(terra)

x <- rast(matrix(1:90, ncol = 3), crs = "EPSG:3857")

# Nothing
compare_spatrasters(x, x)

# Different crs
y_nocrs <- x
crs(y_nocrs) <- NA

compare_spatrasters(x, y_nocrs)

# Different extent
compare_spatrasters(x, x[1:10, , drop = FALSE])

# Different resolution
y_newres <- x

res(y_newres) <- res(x) / 2
compare_spatrasters(x, y_newres)

# Everything

compare_spatrasters(x, project(x, "epsg:3035"))

dieghernan/tidyterra documentation built on Feb. 20, 2025, 4:18 p.m.