#!/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 24.032254815101627 57.01713963518038 -gcp 21600.0 0.0 24.058712124824524 57.01869175347137 -gcp 21600.0 21975.0 24.061721563339233 57.00421933104074 -gcp 0.0 21975.0 24.03540372848511 57.002337940519 GX4799/GX_4799_SD_frame_140.jpg GX_4799_SD_frame_140.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1056.0 3240.0\n984.0 19800.0\n21312.0 19872.0\n21228.0 3012.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_140.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_140.vrt GX_4799_SD_frame_140.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_140.cut.vrt GX_4799_SD_frame_140.xyz