#!/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 24.054087996482853 57.04983143905495 -gcp 21600.0 0.0 24.078796505928043 57.05362724727546 -gcp 21600.0 21852.0 24.085561037063602 57.039685010502055 -gcp 0.0 21852.0 24.060509204864502 57.03602496274684 GX4799/GX_4799_SD_frame_2.jpg GX_4799_SD_frame_2.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "768.0 3024.0\n936.0 19584.0\n21288.0 19752.0\n21132.0 2844.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_2.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_2.vrt GX_4799_SD_frame_2.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_2.cut.vrt GX_4799_SD_frame_2.xyz