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This tag refers to the R package terra. For questions about NASA's Terra satellite, use the tags of its sensors like aster or modis.
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Sum two raster stack together ignoring NAs
Here are example rasters:
library(terra)
set.seed(123)
r1 <- c(rast(matrix(sample(1:10, 100, replace=T), nrow=10, ncol=10)),
rast(matrix(sample(1:10, 100, replace=T), nrow=10, ncol=10)), …