#!/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 25.220232009888 57.075641701094 -gcp 13206.0 0.0 25.343742370605 57.079886760185 -gcp 13206.0 9417.0 25.350608825684 57.03082906051 -gcp 0.0 9417.0 25.227997985597 57.025937270262 LVVA_F7404_US1_GV1749_0002.jpg LVVA_F7404_US1_GV1749_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"4356.0 624.0\n9018.0 669.0\n8961.0 8529.0\n4296.0 8496.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV1749_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV1749_0002.vrt LVVA_F7404_US1_GV1749_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV1749_0002.cut.vrt LVVA_F7404_US1_GV1749_0002.xyz