#!/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 4017.0 1815.0 26.837216666666666 57.25 -gcp 25317.0 1653.0 27.337216666666666 57.25 -gcp 25626.0 21327.0 27.337216666666666 57 -gcp 4161.0 21525.0 26.837216666666666 57 nr/KdwR-LC_U13_Bolwa_1918_.jpg KdwR-LC_U13_Bolwa_1918_.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "4017.0 1815.0\n25317.0 1653.0\n25626.0 21327.0\n4161.0 21525.0" | \
  gdaltransform -tps -output_xy KdwR-LC_U13_Bolwa_1918_.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  KdwR-LC_U13_Bolwa_1918_.vrt KdwR-LC_U13_Bolwa_1918_.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES KdwR-LC_U13_Bolwa_1918_.cut.vrt KdwR-LC_U13_Bolwa_1918_.xyz