#!/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 27.08643343 57.25815375 -gcp 21600.0 0.0 27.10369569 57.3415165 -gcp 21600.0 23403.0 27.27065114 57.33162749 -gcp 0.0 23403.0 27.25603157 57.24920456 GX8464/GX_8464_SK_frame_245.jpg GX_8464_SK_frame_245.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "456.0204255319152 2568.0\n431.93191489361675 19536.0\n20928.19063829787 19656.0\n21072.0 2304.0" | \
  gdaltransform -tps -output_xy GX_8464_SK_frame_245.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_8464_SK_frame_245.vrt GX_8464_SK_frame_245.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_8464_SK_frame_245.cut.vrt GX_8464_SK_frame_245.xyz