#!/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 23.71044807 56.6540121 -gcp 21600.0 0.0 23.70382293 56.74732978 -gcp 21600.0 22038.0 23.88452938 56.75832069 -gcp 0.0 22038.0 23.90020918 56.65361001 GX2261/GX_2261_SK_frame_120.jpg GX_2261_SK_frame_120.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1512.0 2424.0\n1680.0 19536.0\n17304.0 19656.0\n17400.0 2352.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_120.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_120.vrt GX_2261_SK_frame_120.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_120.cut.vrt GX_2261_SK_frame_120.xyz