#!/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 23.97405475 56.69884654 -gcp 21600.0 0.0 23.95498763 56.61290358 -gcp 21600.0 21849.0 23.77826707 56.61608037 -gcp 0.0 21849.0 23.79805726 56.71897796 GX2261/GX_2261_SK_frame_154.jpg GX_2261_SK_frame_154.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1488.0 2328.0\n1272.0 19368.0\n17256.0 19536.0\n17064.0 2232.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_154.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_154.vrt GX_2261_SK_frame_154.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_154.cut.vrt GX_2261_SK_frame_154.xyz