#!/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 26.882600784302 57.52969536455 -gcp 16122.0 0.0 27.038726806641 57.542641340718 -gcp 16122.0 16065.0 27.0627305025 57.457775209763 -gcp 0.0 16065.0 26.907234191895 57.445688409595 LVVA_F7404_US1_GV1768_0002.jpg LVVA_F7404_US1_GV1768_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"672.0 768.0\n15201.0 951.0\n15378.0 14913.0\n501.0 14811.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV1768_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV1768_0002.vrt LVVA_F7404_US1_GV1768_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV1768_0002.cut.vrt LVVA_F7404_US1_GV1768_0002.xyz