#!/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 25.23416628 57.32164961 -gcp 12009.0 0.0 25.24647828 57.30180434 -gcp 12009.0 12495.0 25.20904138 57.29414209 -gcp 0.0 12495.0 25.19638179 57.31394581 GX18586/GX_18586_SK_frame_25.jpg GX_18586_SK_frame_25.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1296.0 756.0\n1278.0 1704.0\n390.0 1722.0\n372.0 9108.0\n11616.0 9144.0\n11532.0 672.0" | \
  gdaltransform -tps -output_xy GX_18586_SK_frame_25.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18586_SK_frame_25.vrt GX_18586_SK_frame_25.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18586_SK_frame_25.cut.vrt GX_18586_SK_frame_25.xyz