#!/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 25.821990966797 57.080912965295 -gcp 13635.0 0.0 25.974598522762 57.092297405093 -gcp 13635.0 16137.0 25.993781089783 57.004803594665 -gcp 0.0 16137.0 25.844821929932 56.990685222578 LVVA_F7404_US1_GV938_0002.jpg LVVA_F7404_US1_GV938_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"3456.0 786.0\n12978.0 765.0\n13026.0 15060.0\n3468.0 15042.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV938_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV938_0002.vrt LVVA_F7404_US1_GV938_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV938_0002.cut.vrt LVVA_F7404_US1_GV938_0002.xyz