#!/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 24.033931686316237 56.94510911487254 -gcp 21600.0 0.0 24.007921176949683 56.945555750989996 -gcp 21600.0 21915.0 24.008422677463983 56.95989613007982 -gcp 0.0 21915.0 24.034754063408098 56.95970448604344 GX4799/GX_4799_SD_frame_121.jpg GX_4799_SD_frame_121.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1056.0 3072.0\n864.0 19584.0\n21216.0 19464.0\n21120.0 3048.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_121.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_121.vrt GX_4799_SD_frame_121.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_121.cut.vrt GX_4799_SD_frame_121.xyz