#!/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 24.035806059837345 56.9856905003411 -gcp 21600.0 0.0 24.06138360500336 56.98579864167296 -gcp 21600.0 21975.0 24.061737656593323 56.971620430832736 -gcp 0.0 21975.0 24.03614938259125 56.971368974625136 GX4799/GX_4799_SD_frame_60.jpg GX_4799_SD_frame_60.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "708.0 3024.0\n864.0 19632.0\n21336.0 19968.0\n21096.0 3000.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_60.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_60.vrt GX_4799_SD_frame_60.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_60.cut.vrt GX_4799_SD_frame_60.xyz