#!/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 25.576086044312 57.162265838661 -gcp 14541.0 0.0 25.714015960693 57.172596873052 -gcp 14541.0 15654.0 25.731611251831 57.096489137724 -gcp 0.0 15654.0 25.597629547119 57.086836412559 LVVA_F7404_US1_GV872_0002.jpg LVVA_F7404_US1_GV872_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"495.0 366.0\n10291.5 351.75\n10200.0 7944.0\n14061.0 7911.0\n14037.0 14814.0\n468.0 14736.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV872_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV872_0002.vrt LVVA_F7404_US1_GV872_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV872_0002.cut.vrt LVVA_F7404_US1_GV872_0002.xyz