#!/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 24.032005742827064 56.95820303931558 -gcp 21600.0 0.0 24.00579214096069 56.95916545968134 -gcp 21600.0 21915.0 24.00712788105011 56.973403966839584 -gcp 0.0 21915.0 24.03312385082245 56.97287183880611 GX4799/GX_4799_SD_frame_124.jpg GX_4799_SD_frame_124.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "768.0 3048.0\n960.0 19536.0\n21264.0 19632.0\n21204.0 2976.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_124.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_124.vrt GX_4799_SD_frame_124.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_124.cut.vrt GX_4799_SD_frame_124.xyz