#!/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 24.04998923608844 56.961953349419495 -gcp 21600.0 0.0 24.075547394659733 56.96125412019881 -gcp 21600.0 21606.0 24.07447654606651 56.94749368330269 -gcp 0.0 21606.0 24.04891608699232 56.94795087482339 GX4799/GX_4799_SD_frame_108.jpg GX_4799_SD_frame_108.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1224.0 2928.0\n936.0 19440.0\n21384.0 19608.0\n21072.0 2832.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_108.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_108.vrt GX_4799_SD_frame_108.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_108.cut.vrt GX_4799_SD_frame_108.xyz