#!/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 24.02916491031647 57.015377176908565 -gcp 21600.0 0.0 24.054265022277836 57.01842309601086 -gcp 21600.0 21975.0 24.06013906002045 57.004350791299245 -gcp 0.0 21975.0 24.03491020202637 57.00126281753125 GX4799/GX_4799_SD_frame_54.jpg GX_4799_SD_frame_54.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "936.0 2832.0\n792.0 19680.0\n21384.0 19944.0\n21162.0 2796.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_54.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_54.vrt GX_4799_SD_frame_54.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_54.cut.vrt GX_4799_SD_frame_54.xyz