#!/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 25.3940177 57.07665636 -gcp 11250.0 0.0 25.40575504 56.98785623 -gcp 11250.0 11250.0 25.23967266 56.98161298 -gcp 0.0 11250.0 25.22821426 57.07081294 GX220/GX_220_SK_frame_576.jpg GX_220_SK_frame_576.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "408.0 1367.9064066852366\n10680.0 1295.959888579387\n10848.0 9744.013370473536\n480.0 9768.0" | \
  gdaltransform -tps -output_xy GX_220_SK_frame_576.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_220_SK_frame_576.vrt GX_220_SK_frame_576.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_220_SK_frame_576.cut.vrt GX_220_SK_frame_576.xyz