#!/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 25.620975494385 57.207384697958 -gcp 6879.0 0.0 25.709381103516 57.220166104194 -gcp 6879.0 5259.0 25.732469558716 57.180878229864 -gcp 0.0 5259.0 25.642175674438 57.167105961946 LVVA_F7404_US2_GV53_0002.jpg LVVA_F7404_US2_GV53_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"330.0 300.0\n6516.0 321.0\n6579.0 4938.0\n387.0 4950.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US2_GV53_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US2_GV53_0002.vrt LVVA_F7404_US2_GV53_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US2_GV53_0002.cut.vrt LVVA_F7404_US2_GV53_0002.xyz