#!/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 25.485877990723 58.045457123671 -gcp 8859.0 0.0 25.502700805664 58.001185222433 -gcp 8859.0 19488.0 25.314044952393 57.985763561801 -gcp 0.0 19488.0 25.300912857056 58.030054536776 LVVA_F7404_US1_GV1227_0002.jpg LVVA_F7404_US1_GV1227_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"988.5 9919.5\n1125.0 1638.0\n8304.0 1764.0\n8183.25 10053.75\n8088.0 18264.0\n912.0 18228.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV1227_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV1227_0002.vrt LVVA_F7404_US1_GV1227_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV1227_0002.cut.vrt LVVA_F7404_US1_GV1227_0002.xyz