#!/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 25.16201257 56.70435566 -gcp 21600.0 0.0 25.14004198 56.61883378 -gcp 21600.0 21975.0 24.96465104 56.62583927 -gcp 0.0 21975.0 24.99051535 56.72538364 GX2261/GX_2261_SK_frame_136.jpg GX_2261_SK_frame_136.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2256.0 2496.0\n2304.0 19632.0\n17280.0 19488.0\n17040.0 2352.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_136.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_136.vrt GX_2261_SK_frame_136.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_136.cut.vrt GX_2261_SK_frame_136.xyz