.rasterObjectFromFile(x, band = band, objecttype = "RasterLayer",: 无法从此文件创建 RasterLayer object

Question

I have this instruction in my script:

wc25 <- stack(list.files(path="./Rhaebo/Bio_PresWC1.4/", pattern = "asc", full.names = T))

but when I run it, it throws me the following message:

Error in .rasterObjectFromFile(x, band = band, objecttype = "RasterLayer",  : 
  Cannot create a RasterLayer object from this file.

I have the following packages loaded:

library(ecospat)
library(sf)
library(ggplot2)
library(maptools)
library(sp)
library(raster)
library(rgeos)
library(dismo)
library(ENMeval)
library(rJava)
library(SSDM)
library(usdm)
library(sdm)
library(plyr)
library(rgdal)
library(MigClim)
library(spatialEco)
library(biomod2)
library(devtools)
library(ENMTools)
library(RColorBrewer)
library(terra)
library(reshape2)
library(ggplot2)
library(ggstatsplot)
library(rasterVis)
library(sf)

Does anyone know what could cause this problem?

Answer 1

The first thing you need to do is to only load the package you actually need for this line of code (ie the raster package) --- and generally, avoid loading packages that are not used in your script. If all these packages are used in your script, then you script is surely too long and complicated and you should cut it into smaller pieces.

And you need to inspect (and show) what is returned by list.files . Probably some file that is not a raster>

You should use pattern = "\\.asc$" as your pattern. \\. is for the dot, . is a wildcard. $ means "ends on"

ff <- list.files(path="./Rhaebo/Bio_PresWC1.4/", pattern = "\\.asc$", full.names = TRUE))
ff
s <- raster::stack(ff)

Or

x <- terra::rast(ff)

And it is a bad idea (very inefficient) to use ascii files. See raster::getData for better access to the old WorldClim data that you are using and geodata::worldclim for the current version.