#!/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 24.096236228942875 56.89800881344407 -gcp 21600.0 0.0 24.071146845817566 56.89623045815824 -gcp 21600.0 21729.0 24.067794084548954 56.91019134620288 -gcp 0.0 21729.0 24.093323349952698 56.91197782255302 GX4799/GX_4799_SD_frame_26.jpg GX_4799_SD_frame_26.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "864.0 3144.0\n840.0 19848.0\n21312.0 20040.0\n21072.0 2988.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_26.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_26.vrt GX_4799_SD_frame_26.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_26.cut.vrt GX_4799_SD_frame_26.xyz