#!/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 24.074193835258487 56.98958053791379 -gcp 21600.0 0.0 24.048900604248047 56.98708464814999 -gcp 21600.0 21975.0 24.04439449310303 57.001023247831405 -gcp 0.0 21975.0 24.06937122344971 57.00369932904592 GX4799/GX_4799_SD_frame_45.jpg GX_4799_SD_frame_45.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "768.0 3048.0\n744.0 19728.0\n21240.0 19896.0\n21072.0 3000.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_45.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_45.vrt GX_4799_SD_frame_45.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_45.cut.vrt GX_4799_SD_frame_45.xyz