gdal arguments to project ...

[scbrown86]

When trying to project a spatraster, its not possible to provide any additional gdal arguments to writeRaster through ..., despite the documentation saying that ... additional arguments for writing files as in writeRaster. This is because there is already a gdal argument present in project. Could this functionality be fixed so that additional arguments can be passed through? Maybe through a named list?

## SpatRaster
a <- rast(ncols=40, nrows=40, xmin=-110, xmax=-90, ymin=40, ymax=60, 
          crs="+proj=longlat +datum=WGS84")
values(a) <- 1:ncell(a)
newcrs="+proj=lcc +lat_1=48 +lat_2=33 +lon_0=-100 +datum=WGS84"
b <- rast(ncols=94, nrows=124, xmin=-944881, xmax=935118, ymin=4664377, ymax=7144377, crs=newcrs)
w <- project(a, b)

# save with compression
writeRaster(w, paste0(tempfile(),".tif"),
            gdal = c("COMPRESS=LZW", "PREDICTOR=3"))

# project and save to file
## works
w <- project(a, b, filename = paste0(tempfile(),".tif"))

# project and save to file with gdal options
## fails
w <- project(a, b, filename = paste0(tempfile(),".tif"),
             gdal = c("COMPRESS=LZW", "PREDICTOR=3"))
Error in if (gdal) { : the condition has length > 1

[scbrown86]

Turns out that this is just a documentation fix. The options can be passed using a named list.

## works  
w <- project(a, b, filename = paste0(tempfile(),".tif"),
             wopt = list(gdal = c("COMPRESS=LZW", "PREDICTOR=3")))

[rhijmans]

Thank you for reporting this. You can indeed use "wopt" but that should not be necessary (except with functions where the ellipses are used for something else, but that is not the case here). I have changed argument "gdal" to "use_gdal" to avoid this issue.