rrcurlgunzip

Get ASCII grid from compressed .gz file from URL in R


I am trying to download and gunzip grid files in ascii format, compressed to .gz files from an URL like this. I tried to get to the files via y <- gzon(url("name-of-url") and then gunzip(y), but for gunzip that is an invalid file. If I can decompress the file, I would like to read the .asc file with raster()

Any ideas how to solve this?


Solution

  • I don't know why unzip does not work on these files, but you can get at the contents as follows:

    URL = "https://opendata.dwd.de/climate_environment/CDC/grids_germany/annual/summer_days/grids_germany_annual_summer_days_1951_17.asc.gz"
    download.file(URL, "grids_germany_annual_summer_days_1951_17.asc.gz")
    
    GZ = gzfile("grids_germany_annual_summer_days_1951_17.asc.gz")
    Lines = readLines(GZ, 10)
    writeLines(Lines, "grids_germany_annual_summer_days_1951_17.asc")
    

    Now you have an ascii text file.