#!/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 25.44208288 56.93052897 -gcp 11091.0 0.0 25.45776844 57.02893727 -gcp 11091.0 10980.0 25.63018084 57.01579821 -gcp 0.0 10980.0 25.61434507 56.9256692 GX825/GX_825_SK_frame_64.jpg GX_825_SK_frame_64.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "552.0 1323.0\n10656.0 1223.8796657381613\n10704.0 9959.95988857939\n576.0 9839.986629526464" | \
  gdaltransform -tps -output_xy GX_825_SK_frame_64.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_825_SK_frame_64.vrt GX_825_SK_frame_64.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_825_SK_frame_64.cut.vrt GX_825_SK_frame_64.xyz