#!/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 25.32866543 57.3100592 -gcp 12009.0 0.0 25.32374966 57.33042902 -gcp 12009.0 12495.0 25.36189858 57.3331307 -gcp 0.0 12495.0 25.36689802 57.31289117 GX18586/GX_18586_SK_frame_31.jpg GX_18586_SK_frame_31.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1356.0 858.0\n1338.0 1626.0\n462.0 1656.0\n420.0 9336.0\n11604.0 9204.0\n11616.0 816.0" | \
  gdaltransform -tps -output_xy GX_18586_SK_frame_31.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18586_SK_frame_31.vrt GX_18586_SK_frame_31.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18586_SK_frame_31.cut.vrt GX_18586_SK_frame_31.xyz