#!/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 24.05236741294231 56.999253529809465 -gcp 21600.0 0.0 24.07918953106065 56.998507963229464 -gcp 21600.0 21729.0 24.07796593104617 56.98407391896066 -gcp 0.0 21729.0 24.051341394862376 56.984676577437995 GX4799/GX_4799_SD_frame_102.jpg GX_4799_SD_frame_102.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1008.0 2736.0\n960.0 19488.0\n21288.0 19584.0\n21144.0 2724.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_102.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_102.vrt GX_4799_SD_frame_102.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_102.cut.vrt GX_4799_SD_frame_102.xyz