#!/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 24.037889513673488 56.914566595017185 -gcp 21600.0 0.0 24.012296559962596 56.91435161548975 -gcp 21600.0 22101.0 24.011783838314315 56.92852024125828 -gcp 0.0 22101.0 24.037445761227445 56.92883537850338 GX4799/GX_4799_SD_frame_115.jpg GX_4799_SD_frame_115.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "864.0 3024.0\n984.0 19776.0\n21336.0 19872.0\n21096.0 3072.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_115.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_115.vrt GX_4799_SD_frame_115.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_115.cut.vrt GX_4799_SD_frame_115.xyz