#!/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 1038.0 1713.0 25.826666666666668 56.5 -gcp 16347.0 1782.0 26.276666666666667 56.5 -gcp 16347.0 15183.0 26.276666666666667 56.25 -gcp 894.0 15138.0 25.826666666666668 56.25 bruno/VI-20_w.y.jpg VI-20_w.y.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1038.0 1713.0\n16347.0 1782.0\n16347.0 15183.0\n894.0 15138.0" | \
  gdaltransform -tps -output_xy VI-20_w.y.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  VI-20_w.y.vrt VI-20_w.y.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES VI-20_w.y.cut.vrt VI-20_w.y.xyz