#!/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 24.0511965751648 57.05466584797653 -gcp 21600.0 0.0 24.076017737388614 57.05832697228051 -gcp 21600.0 21852.0 24.082825005428948 57.04471476323574 -gcp 0.0 21852.0 24.05807967055513 57.04073024325463 GX4799/GX_4799_SD_frame_1.jpg GX_4799_SD_frame_1.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "816.0 3024.0\n888.0 19848.0\n20928.0 20328.0\n21288.0 2892.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_1.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_1.vrt GX_4799_SD_frame_1.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_1.cut.vrt GX_4799_SD_frame_1.xyz