#!/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 25.741653442383 56.927648291143 -gcp 11517.0 0.0 25.847053527832 56.935797144441 -gcp 11517.0 15945.0 25.871086120605 56.853946900021 -gcp 0.0 15945.0 25.764827728271 56.845967934902 LVVA_F7404_US1_GV877_0002.jpg LVVA_F7404_US1_GV877_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1038.0 729.0\n10584.0 948.0\n10425.0 15006.0\n1008.0 14925.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV877_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV877_0002.vrt LVVA_F7404_US1_GV877_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV877_0002.cut.vrt LVVA_F7404_US1_GV877_0002.xyz