#!/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 24.077283740043647 56.93502741231105 -gcp 21600.0 0.0 24.102705717086796 56.93644394126396 -gcp 21600.0 21729.0 24.1053718328476 56.922592414612694 -gcp 0.0 21729.0 24.08006250858307 56.92101139774905 GX4799/GX_4799_SD_frame_23.jpg GX_4799_SD_frame_23.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "840.0 2856.0\n960.0 19464.0\n21168.0 19536.0\n21276.0 2700.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_23.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_23.vrt GX_4799_SD_frame_23.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_23.cut.vrt GX_4799_SD_frame_23.xyz