#!/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 25.136289596558 57.337315871572 -gcp 7215.0 0.0 25.238084793091 57.343429886207 -gcp 7215.0 5913.0 25.266580581665 57.302604193155 -gcp 0.0 5913.0 25.151824951172 57.286790017238 LVVA_F7404_US1_GV221_0002.jpg LVVA_F7404_US1_GV221_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"378.0 270.0\n6894.0 309.0\n6915.0 5325.0\n324.0 5283.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV221_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV221_0002.vrt LVVA_F7404_US1_GV221_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV221_0002.cut.vrt LVVA_F7404_US1_GV221_0002.xyz