#!/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 25.96981957 55.95879773 -gcp 21600.0 0.0 25.98618613 55.98595013 -gcp 21600.0 21975.0 26.03770663 55.97735081 -gcp 0.0 21975.0 26.0215908 55.94758456 GX4599/GX_4599_SD_frame_38.jpg GX_4599_SD_frame_38.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1152.0 2664.0\n888.0 19368.0\n21376.5 19789.5\n21360.0 2616.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_38.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_38.vrt GX_4599_SD_frame_38.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_38.cut.vrt GX_4599_SD_frame_38.xyz