Convert NLCD to Cloud Optimized GeoTiff

## nlcd_to_cog.md

      
        

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              nlcd_to_cog.md
            
          
        
      
    
  
    NLCD data is published in 3x3 degree chunks, as tiff files inside a zip file. For processing this data it's far more convienent if the files are available directly as tiff files without having to unzip.
s3cmd get --skip-existing -r s3://prd-tnm/StagedProducts/NLCD/data/2011/landcover/3x3/
for i in *.zip; do unzip $i '*.tif'; done

mkdir tmp
mkdir clouded

for i in *.tif; do
gdalwarp -srcnodata 0 -dstnodata 0 -co TILED=YES -co BLOCKXSIZE=512 -co BLOCKYSIZE=512 -co COMPRESS=LZW -co ZLEVEL=9 -co TFW=NO $i tmp/$i
gdaladdo -r nearest tmp/$i 2 4 8 16 32
gdal_translate -co TILED=YES -co BLOCKXSIZE=512 -co BLOCKYSIZE=512 -co COMPRESS=LZW -co ZLEVEL=9 -co TFW=NO -co COPY_SRC_OVERVIEWS=YES tmp/$i clouded/$i
rm tmp/$i
done

rmdir tmp

file sizes:

Original zip files: 3.7 gb
Unzipped tiff files: 20 gb
cloud optimized geotiffs: 2.3 gb