#!/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 25.0478518 57.22314011 -gcp 12009.0 0.0 25.08284926 57.19227371 -gcp 12009.0 12495.0 25.0270915 57.17594088 -gcp 0.0 12495.0 24.99559164 57.20238422 GX18586/GX_18586_SK_frame_41.jpg GX_18586_SK_frame_41.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1503.0 618.0\n1509.0 1545.0\n591.0 1551.0\n627.0 9315.0\n11814.0 9330.0\n11832.0 636.0" | \
  gdaltransform -tps -output_xy GX_18586_SK_frame_41.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18586_SK_frame_41.vrt GX_18586_SK_frame_41.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18586_SK_frame_41.cut.vrt GX_18586_SK_frame_41.xyz