#!/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 324.0 732.0 25 57.75 -gcp 14343.0 660.0 25.5 57.75 -gcp 14478.0 13830.0 25.5 57.5 -gcp 366.0 13887.0 25 57.5 Lat075_054_Valmiera_ca1930.jpg Lat075_054_Valmiera_ca1930.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"324.0 732.0\n14343.0 660.0\n14478.0 13830.0\n366.0 13887.0\" | \
  gdaltransform -tps -output_xy Lat075_054_Valmiera_ca1930.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Lat075_054_Valmiera_ca1930.vrt Lat075_054_Valmiera_ca1930.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Lat075_054_Valmiera_ca1930.cut.vrt Lat075_054_Valmiera_ca1930.xyz