#!/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 24.069966673851017 57.00031621606482 -gcp 21600.0 0.0 24.04492557048798 56.99742075160186 -gcp 21600.0 21975.0 24.039813280105594 57.01131166893315 -gcp 0.0 21975.0 24.06436085700989 57.014267384063906 GX4799/GX_4799_SD_frame_47.jpg GX_4799_SD_frame_47.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "744.0 2904.0\n960.0 19680.0\n21216.0 19704.0\n21072.0 2784.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_47.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_47.vrt GX_4799_SD_frame_47.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_47.cut.vrt GX_4799_SD_frame_47.xyz