#!/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 27.39387656 56.78006871 -gcp 21600.0 0.0 27.38750758 56.86336189 -gcp 21600.0 23775.0 27.55570652 56.86665093 -gcp 0.0 23775.0 27.56206259 56.78367408 GX10673/GX_10673_SK_frame_946.jpg GX_10673_SK_frame_946.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "504.0 3960.0\n480.0 20832.0\n20400.0 21000.0\n20280.0 3480.0" | \
  gdaltransform -tps -output_xy GX_10673_SK_frame_946.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10673_SK_frame_946.vrt GX_10673_SK_frame_946.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10673_SK_frame_946.cut.vrt GX_10673_SK_frame_946.xyz