#!/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 24.035708765238873 56.933138276014 -gcp 21600.0 0.0 24.060730172000145 56.93173811360103 -gcp 21600.0 21975.0 24.05810440962281 56.917742326206735 -gcp 0.0 21975.0 24.032935933084197 56.91911546861952 GX4799/GX_4799_SD_frame_69.jpg GX_4799_SD_frame_69.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "840.0 3216.0\n972.0 19752.0\n21480.0 19824.0\n21120.0 2832.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_69.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_69.vrt GX_4799_SD_frame_69.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_69.cut.vrt GX_4799_SD_frame_69.xyz