#!/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 24.037012680602782 56.925407788903705 -gcp 21600.0 0.0 24.01152008856864 56.9252262179298 -gcp 21600.0 22101.0 24.010788847902127 56.93937577739557 -gcp 0.0 22101.0 24.036675047211425 56.939802317435664 GX4799/GX_4799_SD_frame_117.jpg GX_4799_SD_frame_117.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1128.0 3216.0\n888.0 19896.0\n21264.0 19896.0\n21096.0 3168.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_117.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_117.vrt GX_4799_SD_frame_117.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_117.cut.vrt GX_4799_SD_frame_117.xyz