#!/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 24.080936908721927 56.99527603429497 -gcp 21600.0 0.0 24.054962396621708 56.997090578376906 -gcp 21600.0 22038.0 24.0576446056366 57.011247411647524 -gcp 0.0 22038.0 24.083973169326782 57.00995055906261 GX4799/GX_4799_SD_frame_90.jpg GX_4799_SD_frame_90.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "888.0 2904.0\n864.0 19704.0\n21288.0 19800.0\n21180.0 2916.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_90.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_90.vrt GX_4799_SD_frame_90.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_90.cut.vrt GX_4799_SD_frame_90.xyz