#!/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 25.20588412 56.90488971 -gcp 21600.0 0.0 25.16154642 56.82380993 -gcp 21600.0 22098.0 24.98671519 56.84094312 -gcp 0.0 22098.0 25.03875829 56.94382777 GX2261/GX_2261_SK_frame_21.jpg GX_2261_SK_frame_21.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2616.0 912.0\n2424.0 20400.0\n17328.0 20616.0\n17208.0 984.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_21.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_21.vrt GX_2261_SK_frame_21.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_21.cut.vrt GX_2261_SK_frame_21.xyz