#!/bin/bash

GDAL_TILE_PROCESSES=16
GDAL_TILE_ZOOMS=8-14
GDAL_SAMPLING_WARP=cubic
GDAL_SAMPLING_TILE=antialias

# Create virtual dataset with coordinates
gdal_translate -of VRT -a_srs EPSG:4326 -outsize 300% 300% -gcp 0.0 0.0 25.56580024 57.0295774 -gcp 11097.0 0.0 25.74075339 57.01918403 -gcp 11097.0 10980.0 25.73013537 56.9291856 -gcp 0.0 10980.0 25.55550408 56.93116798 GX825/GX_825_SK_frame_62.jpg GX_825_SK_frame_62.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1296.0 480.09359331476344\n9720.0 456.05348189415054\n9600.0 10392.013370473536\n1176.0 10464.05348189415" | \
  gdaltransform -tps -output_xy GX_825_SK_frame_62.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_825_SK_frame_62.vrt GX_825_SK_frame_62.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_825_SK_frame_62.cut.vrt GX_825_SK_frame_62.xyz