#!/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 25.33324957 56.17463391 -gcp 21600.0 0.0 25.28359587 56.17769261 -gcp 21600.0 21666.0 25.28903604 56.20623256 -gcp 0.0 21666.0 25.34027696 56.20246692 GX1006/GX_1006_SD_frame_174.jpg GX_1006_SD_frame_174.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1008.0 2892.0\n924.0 19380.0\n21564.0 19860.0\n21372.0 2808.0" | \
  gdaltransform -tps -output_xy GX_1006_SD_frame_174.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_1006_SD_frame_174.vrt GX_1006_SD_frame_174.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_1006_SD_frame_174.cut.vrt GX_1006_SD_frame_174.xyz