#!/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 23.98246765136719 57.0326506280403 -gcp 12924.0 0.0 24.104518890380863 57.04367154219903 -gcp 12924.0 15081.0 24.124517440795902 56.96842154740723 -gcp 0.0 15081.0 23.998174667358402 56.95765911886433 LVVA_F7404_US1_GV1841_0002.jpg LVVA_F7404_US1_GV1841_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"456.0 486.0\n12474.0 216.0\n12456.0 14268.0\n540.0 14196.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV1841_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV1841_0002.vrt LVVA_F7404_US1_GV1841_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV1841_0002.cut.vrt LVVA_F7404_US1_GV1841_0002.xyz