#!/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 25.55643082 56.86687383 -gcp 10980.0 0.0 25.57606459 56.96399949 -gcp 10980.0 11091.0 25.7488203 56.94907613 -gcp 0.0 11091.0 25.72969079 56.86072703 GX825/GX_825_SK_frame_150.jpg GX_825_SK_frame_150.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "480.0 1251.0\n10704.0 1079.6924791086358\n10632.0 9696.0\n432.0 9792.187186629526" | \
  gdaltransform -tps -output_xy GX_825_SK_frame_150.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_825_SK_frame_150.vrt GX_825_SK_frame_150.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_825_SK_frame_150.cut.vrt GX_825_SK_frame_150.xyz