#!/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 23.30253839 56.43221285 -gcp 14031.0 0.0 23.39789613 56.52135495 -gcp 14031.0 14082.0 23.54204893 56.47062809 -gcp 0.0 14082.0 23.46555233 56.39024972 GX2685/GX_2685A_SK_frame_77.jpg GX_2685A_SK_frame_77.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1488.0 411.0\n13800.0 311.71922005571037\n13848.0 13776.160445682452\n1560.0 13896.026740947076" | \
  gdaltransform -tps -output_xy GX_2685A_SK_frame_77.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2685A_SK_frame_77.vrt GX_2685A_SK_frame_77.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2685A_SK_frame_77.cut.vrt GX_2685A_SK_frame_77.xyz