#!/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 24.080067873001102 56.974865817910114 -gcp 21600.0 0.0 24.05418455600739 56.973316253950756 -gcp 21600.0 21975.0 24.051282405853275 56.98742660078578 -gcp 0.0 21975.0 24.076527357101444 56.98936427305754 GX4799/GX_4799_SD_frame_42.jpg GX_4799_SD_frame_42.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "648.0 2880.0\n840.0 19656.0\n21264.0 19608.0\n21000.0 2784.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_42.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_42.vrt GX_4799_SD_frame_42.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_42.cut.vrt GX_4799_SD_frame_42.xyz