#!/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 23.90540449 56.98605559 -gcp 21414.0 0.0 23.95652404 57.08271949 -gcp 21414.0 21789.0 24.12326323 57.05562713 -gcp 0.0 21789.0 24.08445024 56.965982 GX2206/GX_2206_SK_frame_57.jpg GX_2206_SK_frame_57.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "960.0 2460.0\n1080.0 19752.0\n21312.0 19716.0\n21336.0 2808.0" | \
  gdaltransform -tps -output_xy GX_2206_SK_frame_57.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2206_SK_frame_57.vrt GX_2206_SK_frame_57.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2206_SK_frame_57.cut.vrt GX_2206_SK_frame_57.xyz