#!/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 23.75686169 56.8043794 -gcp 21690.0 0.0 23.72218609 56.88863561 -gcp 21690.0 21573.0 23.89768544 56.91815836 -gcp 0.0 21573.0 23.92573357 56.81311894 GX2261/GX_2261_SK_frame_46.jpg GX_2261_SK_frame_46.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2640.0 1439.9197771587742\n17376.0 1344.0\n17520.0 19680.1069637883\n2640.0 19968.294150417823" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_46.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_46.vrt GX_2261_SK_frame_46.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_46.cut.vrt GX_2261_SK_frame_46.xyz