#!/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 27.50783443 57.04537576 -gcp 22143.0 0.0 27.51534564 57.12875121 -gcp 22143.0 21768.0 27.66245944 57.13279223 -gcp 0.0 21768.0 27.67314434 57.0413252 GX10525/GX_10525_SK_frame_480.jpg GX_10525_SK_frame_480.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1176.0 2856.0\n21072.0 1920.0\n21336.0 19584.0\n1680.0 19752.0" | \
  gdaltransform -tps -output_xy GX_10525_SK_frame_480.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10525_SK_frame_480.vrt GX_10525_SK_frame_480.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10525_SK_frame_480.cut.vrt GX_10525_SK_frame_480.xyz