#!/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 25.880355834961 57.01672056604 -gcp 15312.0 0.0 26.037082672119 57.034752325785 -gcp 15312.0 16254.0 26.073474884033 56.950029950239 -gcp 0.0 16254.0 25.912628173828 56.929240735739 LVVA_F7404_US1_GV941_0002.jpg LVVA_F7404_US1_GV941_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"810.0 897.0\n14775.0 1218.0\n14589.0 15333.0\n693.0 15126.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV941_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV941_0002.vrt LVVA_F7404_US1_GV941_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV941_0002.cut.vrt LVVA_F7404_US1_GV941_0002.xyz