#!/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 25.408115386963 56.904034669589 -gcp 10626.0 0.0 25.50853729248 56.91078294292 -gcp 10626.0 18090.0 25.528450012207 56.815444436403 -gcp 0.0 18090.0 25.428628921509 56.807222320235 LVVA_F7404_US1_GV1697_0002.jpg LVVA_F7404_US1_GV1697_0002.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"720.0 732.0\n10002.0 849.0\n10005.0 10341.0\n696.0 10272.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV1697_0002.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV1697_0002.vrt LVVA_F7404_US1_GV1697_0002.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV1697_0002.cut.vrt LVVA_F7404_US1_GV1697_0002.xyz