#!/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 24.083983898162842 56.963999969298776 -gcp 21600.0 0.0 24.05788064002991 56.962640052761145 -gcp 21600.0 21975.0 24.055053591728214 56.97675152104368 -gcp 0.0 21975.0 24.081033468246464 56.9786078952016 GX4799/GX_4799_SD_frame_40.jpg GX_4799_SD_frame_40.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "840.0 2928.0\n672.0 19464.0\n21072.0 20304.0\n21024.0 2952.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_40.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_40.vrt GX_4799_SD_frame_40.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_40.cut.vrt GX_4799_SD_frame_40.xyz