#!/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 24.033477902412415 56.97316129630137 -gcp 21600.0 0.0 24.007294178009033 56.97384837620788 -gcp 21600.0 21915.0 24.008149802684787 56.98780362151184 -gcp 0.0 21915.0 24.03403271237274 56.98772383492414 GX4799/GX_4799_SD_frame_127.jpg GX_4799_SD_frame_127.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1080.0 2904.0\n1128.0 19704.0\n21408.0 19968.0\n21264.0 2880.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_127.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_127.vrt GX_4799_SD_frame_127.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_127.cut.vrt GX_4799_SD_frame_127.xyz