#!/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 25.044536590576 56.891237720034 -gcp 10464.0 0.0 25.14573097229 56.89705079731 -gcp 10464.0 9552.0 25.156202316284 56.84840874013 -gcp 0.0 9552.0 25.054235458374 56.842541151273 LVVA_F7404_US1_GV741_0002.jpg LVVA_F7404_US1_GV741_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"546.0 594.0\n9909.0 594.0\n9969.0 8589.0\n561.0 8616.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV741_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV741_0002.vrt LVVA_F7404_US1_GV741_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV741_0002.cut.vrt LVVA_F7404_US1_GV741_0002.xyz