#!/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 342.0 729.0 26.5 57.25 -gcp 14766.0 645.0 27 57.25 -gcp 14919.0 13779.0 27 57 -gcp 411.0 13860.0 26.5 57 Lat075_083_Gulbene_ca1930.jpg Lat075_083_Gulbene_ca1930.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"342.0 729.0\n14766.0 645.0\n14919.0 13779.0\n411.0 13860.0\" | \
  gdaltransform -tps -output_xy Lat075_083_Gulbene_ca1930.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Lat075_083_Gulbene_ca1930.vrt Lat075_083_Gulbene_ca1930.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Lat075_083_Gulbene_ca1930.cut.vrt Lat075_083_Gulbene_ca1930.xyz