#!/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 25.34362972 56.17782301 -gcp 21381.0 0.0 25.34662843 56.20680543 -gcp 21381.0 20811.0 25.39886713 56.20603563 -gcp 0.0 20811.0 25.3971076 56.17582241 GX1006/GX_1006_SD_frame_132.jpg GX_1006_SD_frame_132.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "840.0 2832.0\n516.0 18756.0\n21264.0 19032.0\n21144.0 2496.0" | \
  gdaltransform -tps -output_xy GX_1006_SD_frame_132.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_1006_SD_frame_132.vrt GX_1006_SD_frame_132.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_1006_SD_frame_132.cut.vrt GX_1006_SD_frame_132.xyz