#!/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 25.66919679 56.97316003 -gcp 10980.0 0.0 25.70719242 56.8784247 -gcp 10980.0 11160.0 25.53312778 56.8623934 -gcp 0.0 11160.0 25.50178362 56.95169883 GX825/GX_825_SK_frame_86.jpg GX_825_SK_frame_86.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "552.0 1227.0\n10608.0 1080.0668523676882\n10536.0 9888.0\n552.0 9768.187186629526" | \
  gdaltransform -tps -output_xy GX_825_SK_frame_86.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_825_SK_frame_86.vrt GX_825_SK_frame_86.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_825_SK_frame_86.cut.vrt GX_825_SK_frame_86.xyz