#!/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 24.095174074172977 56.91158539081252 -gcp 21600.0 0.0 24.06936585903168 56.9101913460607 -gcp 21600.0 21729.0 24.066683650016788 56.924123594875056 -gcp 0.0 21729.0 24.092357754707336 56.92575424740825 GX4799/GX_4799_SD_frame_29.jpg GX_4799_SD_frame_29.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "696.0 2520.0\n864.0 19440.0\n21360.0 19896.0\n21192.0 2400.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_29.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_29.vrt GX_4799_SD_frame_29.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_29.cut.vrt GX_4799_SD_frame_29.xyz