#!/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 24.97374314 56.97230842 -gcp 21414.0 0.0 24.97383561 57.07101134 -gcp 21414.0 21666.0 25.1458733 57.06838668 -gcp 0.0 21666.0 25.15066404 56.97793988 GX2206/GX_2206_SK_frame_37.jpg GX_2206_SK_frame_37.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "792.0 2904.0\n696.0 19368.0\n21000.0 19296.0\n20928.0 2934.0" | \
  gdaltransform -tps -output_xy GX_2206_SK_frame_37.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2206_SK_frame_37.vrt GX_2206_SK_frame_37.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2206_SK_frame_37.cut.vrt GX_2206_SK_frame_37.xyz