#!/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 25.956230163574 56.76773104744 -gcp 10440.0 0.0 26.047382354736 56.777090476279 -gcp 10440.0 8493.0 26.067380905151 56.733895365632 -gcp 0.0 8493.0 25.970821380615 56.723583308972 LVVA_F7404_US1_GV1118_0002.jpg LVVA_F7404_US1_GV1118_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"456.0 375.0\n10059.0 441.0\n9996.0 7569.0\n465.0 7524.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV1118_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV1118_0002.vrt LVVA_F7404_US1_GV1118_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV1118_0002.cut.vrt LVVA_F7404_US1_GV1118_0002.xyz