#!/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 1257.0 2133.0 24.75 58 -gcp 16986.0 2181.0 25.5 58 -gcp 17082.0 22068.0 25.5 57.5 -gcp 1188.0 22020.0 24.75 57.5 lnb/24798675.jpg 24798675.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1257.0 2133.0\n16986.0 2181.0\n17082.0 22068.0\n1188.0 22020.0" | \
  gdaltransform -tps -output_xy 24798675.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  24798675.vrt 24798675.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 24798675.cut.vrt 24798675.xyz