#!/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 24.084010720252994 56.95430107292447 -gcp 21600.0 0.0 24.058030843734745 56.9536604357198 -gcp 21600.0 21543.0 24.056528806686405 56.967710972030154 -gcp 0.0 21543.0 24.082744717597965 56.968690568292814 GX4799/GX_4799_SD_frame_38.jpg GX_4799_SD_frame_38.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "840.0 2688.0\n960.0 19320.0\n21384.0 19704.0\n21192.0 2628.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_38.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_38.vrt GX_4799_SD_frame_38.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_38.cut.vrt GX_4799_SD_frame_38.xyz