#!/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 25.30980848 56.18355259 -gcp 21381.0 0.0 25.32525195 56.2112916 -gcp 21381.0 20811.0 25.37577331 56.20344566 -gcp 0.0 20811.0 25.3609246 56.1740128 GX1006/GX_1006_SD_frame_131.jpg GX_1006_SD_frame_131.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "768.0 2556.0\n648.0 18816.0\n21312.0 19128.0\n21066.0 2424.0" | \
  gdaltransform -tps -output_xy GX_1006_SD_frame_131.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_1006_SD_frame_131.vrt GX_1006_SD_frame_131.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_1006_SD_frame_131.cut.vrt GX_1006_SD_frame_131.xyz