#!/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 24.17125225 56.91608932 -gcp 21381.0 0.0 24.24611807 56.90268721 -gcp 21381.0 20811.0 24.21802998 56.86561894 -gcp 0.0 20811.0 24.14970875 56.88888176 GX4199/GX_4199_SD_frame_147.jpg GX_4199_SD_frame_147.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "17880.0 2376.0\n17832.0 600.0\n4440.0 468.0\n1176.0 4740.0\n984.0 7008.0\n720.0 18792.0\n2400.0 18984.0\n2592.0 20472.0\n20664.0 20304.0\n20616.0 2424.0" | \
  gdaltransform -tps -output_xy GX_4199_SD_frame_147.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4199_SD_frame_147.vrt GX_4199_SD_frame_147.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4199_SD_frame_147.cut.vrt GX_4199_SD_frame_147.xyz