#!/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 27.08599806 57.25931935 -gcp 21939.0 0.0 27.04116225 57.2619072 -gcp 21939.0 20811.0 27.04562545 57.28419232 -gcp 0.0 20811.0 27.08827257 57.28231351 GX644/GX_644_SD_frame_959.jpg GX_644_SD_frame_959.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "912.0 2808.0\n696.0 18864.0\n21144.0 19272.0\n21264.0 2448.0" | \
  gdaltransform -tps -output_xy GX_644_SD_frame_959.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_644_SD_frame_959.vrt GX_644_SD_frame_959.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_644_SD_frame_959.cut.vrt GX_644_SD_frame_959.xyz