How to save several asc files to geotiff

Question

In QGIS (2.18), I have several raster files (.asc-format) that have no projection information. The images display well at EPSG:5677. My aim is to store all the files in a new folder, using the GeoTIFF format and assigning EPSG:5677.

I have no python experience, however some python coding could help me here, I guess. I read something similar but shapefile-related here: Exporting several files at same time in QGIS?

Of course, this doesn't work with my raster files. So here goes my question: how can I export a bunch of raster files, using the original file names and assigning the desired coordinate reference system without having to export every single file manually?

Answer 1

Based on the User's comment that they would be open to trying this in R, here's the solution:

#Load the three packages below 
library(sp)
library(raster)
library(rgdal)

#List the files that you want to export from the source folder
files <- list.files(path="C:\\Users\\.", pattern="asc$", full.names=TRUE) #selects all the asc files in the directory
s <- stack(files) # stack all of them using r raster library
proj4string(s) <- CRS("+init=epsg:5677") #Sets it to the projection you wanted
newname<-paste("C:\\Users\\",names(s)) #Saves the previous names
writeRaster(s,newname, bylayer=T, format="GTiff")#Edited based on Fumy's comment    

Answer 2

Given that you have QGIS, you therefore also have GDAL installed on your machine. So I suggest you adapt the example in this post over on Stackexchange and create a batch file.

In your case, you will also want to set the gdal_translate a_srs switch to 5677 and change the -of switch (see documentation). So the relevant line in the batch file will be something like this:

gdal_translate -of "GTiff" -a_srs 5677 %mypath%!infile! %mypath%!outfile!

If you leave out the -of switch altogether, it will default to GeoTiff anyway. I just wanted to differentiate from the example given in the link. If you do not have an environment variable set for gdal_translate (which in a standard osgeo4w installation probably won't be the case) then you will have to run this command from the osgeo4w bin folder (in my case c:\osgeo4w64\bin).