#!/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 24.075943837993645 56.95257077408493 -gcp 21600.0 0.0 24.10139605486258 56.95374634268797 -gcp 21600.0 21729.0 24.103819668436582 56.93979251276474 -gcp 0.0 21729.0 24.078420944616056 56.938450729622936 GX4799/GX_4799_SD_frame_20.jpg GX_4799_SD_frame_20.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "624.0 3048.0\n720.0 19752.0\n21192.0 19728.0\n21072.0 2880.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_20.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_20.vrt GX_4799_SD_frame_20.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_20.cut.vrt GX_4799_SD_frame_20.xyz