#!/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 25.23651994 56.9008382 -gcp 21600.0 0.0 25.18830843 56.82260084 -gcp 21600.0 22098.0 25.01258739 56.8406152 -gcp 0.0 22098.0 25.06969254 56.945581 GX2261/GX_2261_SK_frame_20.jpg GX_2261_SK_frame_20.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2592.0 960.0\n2376.0 20400.0\n17424.0 20592.0\n17280.0 1056.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_20.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_20.vrt GX_2261_SK_frame_20.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_20.cut.vrt GX_2261_SK_frame_20.xyz