#!/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 25.48511624 57.15050612 -gcp 20475.0 0.0 25.48775554 57.23015575 -gcp 20475.0 17085.0 25.61026812 57.2297841 -gcp 0.0 17085.0 25.61006427 57.14972628 GX10802/c_GX_10802_SK_frame_391.jpg c_GX_10802_SK_frame_391.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "0.0 0.0\n0.0 17082.0\n20472.0 17082.0\n20472.0 0.0" | \
  gdaltransform -tps -output_xy c_GX_10802_SK_frame_391.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  c_GX_10802_SK_frame_391.vrt c_GX_10802_SK_frame_391.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES c_GX_10802_SK_frame_391.cut.vrt c_GX_10802_SK_frame_391.xyz