#!/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 25.79672456 56.39518344 -gcp 21600.0 0.0 25.74556614 56.39840761 -gcp 21600.0 22038.0 25.75068867 56.42894777 -gcp 0.0 22038.0 25.80467348 56.42491695 GX4599/GX_4599_SD_frame_145.jpg GX_4599_SD_frame_145.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "792.0 3024.0\n768.0 19740.0\n21420.0 19812.0\n21360.0 2892.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_145.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_145.vrt GX_4599_SD_frame_145.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_145.cut.vrt GX_4599_SD_frame_145.xyz