#!/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 23.73926704 56.68828697 -gcp 21600.0 0.0 23.68960151 56.65833416 -gcp 21600.0 21603.0 23.64407796 56.68315323 -gcp 0.0 21603.0 23.67951758 56.70902795 GX2525/GX_2525_SK_frame_3.jpg GX_2525_SK_frame_3.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "996.0 2820.0\n1008.0 19500.0\n21552.0 19392.0\n21597.0 3000.0" | \
  gdaltransform -tps -output_xy GX_2525_SK_frame_3.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2525_SK_frame_3.vrt GX_2525_SK_frame_3.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2525_SK_frame_3.cut.vrt GX_2525_SK_frame_3.xyz