#!/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 25.99148403 57.04246146 -gcp 21600.0 0.0 25.99936126 57.1260808 -gcp 21600.0 23091.0 26.16475919 57.12220355 -gcp 0.0 23091.0 26.15785479 57.03637263 GX10525/GX_10525_SK_frame_506.jpg GX_10525_SK_frame_506.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1536.0 3552.0\n1440.0 19680.0\n20688.0 19488.0\n20640.0 3120.0" | \
  gdaltransform -tps -output_xy GX_10525_SK_frame_506.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10525_SK_frame_506.vrt GX_10525_SK_frame_506.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10525_SK_frame_506.cut.vrt GX_10525_SK_frame_506.xyz