#!/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 24.62455049 56.85665423 -gcp 21600.0 0.0 24.58948203 56.77263675 -gcp 21600.0 21729.0 24.41298191 56.7859259 -gcp 0.0 21729.0 24.45643087 56.88784167 GX2261/GX_2261_SK_frame_71.jpg GX_2261_SK_frame_71.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1752.0 2256.0\n1968.0 19416.0\n17208.0 19608.0\n16920.0 1944.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_71.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_71.vrt GX_2261_SK_frame_71.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_71.cut.vrt GX_2261_SK_frame_71.xyz