#!/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 25.06887306 57.22111453 -gcp 12009.0 0.0 25.10145319 57.19519113 -gcp 12009.0 12495.0 25.0497729 57.17488967 -gcp 0.0 12495.0 25.01656828 57.20459736 GX18586/GX_18586_SK_frame_39.jpg GX_18586_SK_frame_39.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "996.0 696.0\n972.0 1560.0\n0.0 1572.0\n0.0 9456.0\n11142.0 9558.0\n11340.0 822.0" | \
  gdaltransform -tps -output_xy GX_18586_SK_frame_39.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18586_SK_frame_39.vrt GX_18586_SK_frame_39.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18586_SK_frame_39.cut.vrt GX_18586_SK_frame_39.xyz