#!/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 22.41415061 56.66559507 -gcp 21600.0 0.0 22.4042709 56.68808303 -gcp 21600.0 21603.0 22.44575216 56.69318029 -gcp 0.0 21603.0 22.4548069 56.67063278 GX4471/GX_4471_SD_frame_80.jpg GX_4471_SD_frame_80.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "918.0 2256.0\n1158.0 19530.0\n21534.0 19422.0\n21492.0 2370.0" | \
  gdaltransform -tps -output_xy GX_4471_SD_frame_80.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4471_SD_frame_80.vrt GX_4471_SD_frame_80.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4471_SD_frame_80.cut.vrt GX_4471_SD_frame_80.xyz