#!/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 24.69065666 56.97705262 -gcp 21414.0 0.0 24.73618984 57.07333225 -gcp 21414.0 21666.0 24.90465403 57.04438357 -gcp 0.0 21666.0 24.86180305 56.95700397 GX2206/GX_2206_SK_frame_42.jpg GX_2206_SK_frame_42.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "912.0 3000.0\n624.0 19272.0\n21144.0 19368.0\n21096.0 2976.0" | \
  gdaltransform -tps -output_xy GX_2206_SK_frame_42.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2206_SK_frame_42.vrt GX_2206_SK_frame_42.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2206_SK_frame_42.cut.vrt GX_2206_SK_frame_42.xyz