#!/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 24.45950754 56.93638708 -gcp 21600.0 0.0 24.42515694 56.85186565 -gcp 21600.0 22161.0 24.2468062 56.86360247 -gcp 0.0 22161.0 24.28708839 56.96750942 GX2261/GX_2261_SK_frame_35.jpg GX_2261_SK_frame_35.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2496.0 2184.0\n2280.0 20208.0\n17184.0 20112.0\n16992.0 2160.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_35.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_35.vrt GX_2261_SK_frame_35.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_35.cut.vrt GX_2261_SK_frame_35.xyz