#!/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 24.074274301528934 56.979812296338984 -gcp 21600.0 0.0 24.100055694580078 56.980753574776145 -gcp 21600.0 21852.0 24.10156846046448 56.96650910381573 -gcp 0.0 21852.0 24.076076745986942 56.965602571235415 GX4799/GX_4799_SD_frame_15.jpg GX_4799_SD_frame_15.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "804.0 2784.0\n600.0 19740.0\n21060.0 20064.0\n21276.0 3072.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_15.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_15.vrt GX_4799_SD_frame_15.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_15.cut.vrt GX_4799_SD_frame_15.xyz