#!/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 23.7915441 56.7256807 -gcp 21600.0 0.0 23.78352411 56.81360377 -gcp 21600.0 21729.0 23.95860393 56.82596494 -gcp 0.0 21729.0 23.96977369 56.7228696 GX2261/GX_2261_SK_frame_85.jpg GX_2261_SK_frame_85.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1872.0 2208.0\n1632.0 19008.0\n2424.0 19752.0\n2376.0 20976.0\n17340.0 21198.0\n17040.0 1968.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_85.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_85.vrt GX_2261_SK_frame_85.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_85.cut.vrt GX_2261_SK_frame_85.xyz