#!/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 24.09562468528748 56.902490947604484 -gcp 21600.0 0.0 24.070637226104743 56.90056632668395 -gcp 21600.0 21975.0 24.06697601079941 56.914392359016006 -gcp 0.0 21975.0 24.092129766941074 56.916489028188984 GX4799/GX_4799_SD_frame_70.jpg GX_4799_SD_frame_70.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "744.0 3240.0\n1008.0 19824.0\n21456.0 19992.0\n21240.0 2856.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_70.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_70.vrt GX_4799_SD_frame_70.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_70.cut.vrt GX_4799_SD_frame_70.xyz