#!/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 26.670169830322 57.360886278397 -gcp 7161.0 0.0 26.771364212036 57.364820923045 -gcp 7161.0 7653.0 26.77453994751 57.305710578318 -gcp 0.0 7653.0 26.674976348877 57.300842246155 LVVA_F7404_US1_GV444_0002.jpg LVVA_F7404_US1_GV444_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"375.0 237.0\n6741.0 267.0\n6741.0 5007.0\n3216.75 5002.5\n3217.5 6817.5\n408.0 6825.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV444_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV444_0002.vrt LVVA_F7404_US1_GV444_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV444_0002.cut.vrt LVVA_F7404_US1_GV444_0002.xyz