#!/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 25.21478176 56.85111926 -gcp 21627.0 0.0 25.19272021 56.76597878 -gcp 21627.0 21897.0 25.02124992 56.7698129 -gcp 0.0 21897.0 25.04228354 56.87177608 GX2261/GX_2261_SK_frame_61.jpg GX_2261_SK_frame_61.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2640.0 1254.0\n17472.0 1440.0267409470753\n17616.0 19968.88245125348\n2496.0 20256.267409470755" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_61.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_61.vrt GX_2261_SK_frame_61.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_61.cut.vrt GX_2261_SK_frame_61.xyz