#!/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 24.086290597915653 56.95222700678784 -gcp 21600.0 0.0 24.06018733978272 56.95432739798263 -gcp 21600.0 22038.0 24.063116312026985 56.96832797461703 -gcp 0.0 22038.0 24.089772105216984 56.96715244442209 GX4799/GX_4799_SD_frame_81.jpg GX_4799_SD_frame_81.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "936.0 2784.0\n936.0 19512.0\n21216.0 20064.0\n21216.0 2808.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_81.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_81.vrt GX_4799_SD_frame_81.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_81.cut.vrt GX_4799_SD_frame_81.xyz