#!/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 25.36729638 56.77136894 -gcp 21600.0 0.0 25.36907775 56.85481227 -gcp 21600.0 23340.0 25.53736404 56.85371681 -gcp 0.0 23340.0 25.53475533 56.76964043 GX10673/GX_10673_SK_frame_981.jpg GX_10673_SK_frame_981.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "768.0 3072.0\n624.0 19800.0\n20040.0 20328.0\n20496.0 3336.0" | \
  gdaltransform -tps -output_xy GX_10673_SK_frame_981.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10673_SK_frame_981.vrt GX_10673_SK_frame_981.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10673_SK_frame_981.cut.vrt GX_10673_SK_frame_981.xyz