#!/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 24.96711730957 56.744345796669 -gcp 8316.0 0.0 24.976902008057 56.705824877263 -gcp 8316.0 18948.0 24.79640007019 56.69404410526 -gcp 0.0 18948.0 24.788246154785 56.733424557093 LVVA_F7404_US1_GV695_0002.jpg LVVA_F7404_US1_GV695_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"705.0 828.0\n7980.0 1047.0\n7710.0 17988.0\n618.0 18090.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV695_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV695_0002.vrt LVVA_F7404_US1_GV695_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV695_0002.cut.vrt LVVA_F7404_US1_GV695_0002.xyz