#!/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 23.92171999 56.76151629 -gcp 21600.0 0.0 23.91990348 56.84637618 -gcp 21600.0 23775.0 24.09061847 56.84990193 -gcp 0.0 23775.0 24.09793543 56.76330046 GX10673/GX_10673_SK_frame_006.jpg GX_10673_SK_frame_006.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "780.0 3780.0\n642.0 20922.0\n20538.0 21060.0\n20424.0 3480.0" | \
  gdaltransform -tps -output_xy GX_10673_SK_frame_006.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10673_SK_frame_006.vrt GX_10673_SK_frame_006.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10673_SK_frame_006.cut.vrt GX_10673_SK_frame_006.xyz