#!/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 25.58213346 55.96109516 -gcp 43200.0 0.0 25.62834097 55.94923263 -gcp 43200.0 42714.0 25.60753007 55.92227749 -gcp 0.0 42714.0 25.55905504 55.93494476 GX1006/GX_1006_SD_frame_160.jpg GX_1006_SD_frame_160.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1680.0 5568.0\n1632.0 38688.0\n42720.0 39360.0\n42912.0 5664.0" | \
  gdaltransform -tps -output_xy GX_1006_SD_frame_160.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_1006_SD_frame_160.vrt GX_1006_SD_frame_160.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_1006_SD_frame_160.cut.vrt GX_1006_SD_frame_160.xyz