#!/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 23.98757645 56.71635066 -gcp 21600.0 0.0 23.97499044 56.80322742 -gcp 21600.0 21852.0 24.14939616 56.81954077 -gcp 0.0 21852.0 24.16597702 56.71483785 GX2261/GX_2261_SK_frame_87.jpg GX_2261_SK_frame_87.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2712.0 888.0\n2736.0 20016.0\n17352.0 19824.0\n17136.0 840.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_87.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_87.vrt GX_2261_SK_frame_87.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_87.cut.vrt GX_2261_SK_frame_87.xyz