#!/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 24.02917563915253 57.0291270986294 -gcp 21600.0 0.0 24.054624438285828 57.03235579767814 -gcp 21600.0 21915.0 24.06081229448319 57.01815589497946 -gcp 0.0 21915.0 24.034751080448093 57.01481561672319 GX4799/GX_4799_SD_frame_137.jpg GX_4799_SD_frame_137.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1080.0 3000.0\n1224.0 19728.0\n21456.0 19920.0\n21216.0 2880.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_137.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_137.vrt GX_4799_SD_frame_137.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_137.cut.vrt GX_4799_SD_frame_137.xyz