Overwriting files in function pixel_metrics()

Question

I'm trying to test my pixel_metrics() custom function, and I'm not sure how to overwrite the old file, like the error message suggests in the screenshot. I have added overwrite=TRUE to my function call, but it doesn't seem to be working.

It seems like internally pixel_metrics() is calling writeRaster() -- maybe there is a way to propagate overwrite=TRUE to writeRaster() ?

Function call:

canopy_metrics = pixel_metrics(norm, ~lcp_pixel_metrics(Z, ReturnNumber), 16.4042, overwrite=TRUE)

Error message:

r: [writeRaster] file exists. You can use 'overwrite=TRUE' to overwrite it

In addition, I've tried running the following line of code, inspired by this post.

canopy_metrics@output_options$drivers$Raster$param$overwrite <- TRUE

But R says that "output_options" does not exist for class "SpatRaster."

Answer 1

Your code canopy_metrics@output_options$drivers$Raster$param$overwrite <- TRUE is correct for RasterLayer from the package raster but applies to a LAScatalog. Here the default output is a SpatRaster from terra. use:

norm@output_options$drivers$SpatRaster$param$overwrite <- TRUE