#!/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 24.040848612785343 56.904274863442254 -gcp 21600.0 0.0 24.015212059021 56.903905784446074 -gcp 21600.0 22101.0 24.014385938644413 56.91801899360342 -gcp 0.0 22101.0 24.03994202613831 56.918595825984596 GX4799/GX_4799_SD_frame_113.jpg GX_4799_SD_frame_113.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "17892.0 2904.0\n17808.0 996.0\n2748.0 1176.0\n2748.0 2424.0\n972.0 2436.0\n1008.0 10740.0\n21192.0 10728.0\n21228.0 2892.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_113.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_113.vrt GX_4799_SD_frame_113.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_113.cut.vrt GX_4799_SD_frame_113.xyz