#!/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 25.47055721 56.77324587 -gcp 21600.0 0.0 25.47776699 56.85623467 -gcp 21600.0 23775.0 25.64623117 56.85278536 -gcp 0.0 23775.0 25.64086676 56.76838958 GX10673/GX_10673_SK_frame_909.jpg GX_10673_SK_frame_909.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "624.0 4008.0\n768.0 21192.0\n20784.0 20928.0\n20256.0 3480.0" | \
  gdaltransform -tps -output_xy GX_10673_SK_frame_909.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10673_SK_frame_909.vrt GX_10673_SK_frame_909.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10673_SK_frame_909.cut.vrt GX_10673_SK_frame_909.xyz