#!/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 453.0 684.0 21.5 57.5 -gcp 14694.0 798.0 22 57.5 -gcp 14589.0 13923.0 22 57.25 -gcp 282.0 13785.0 21.5 57.25 Lat075_009_Ventspils_ca1930.jpg Lat075_009_Ventspils_ca1930.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"453.0 684.0\n14694.0 798.0\n14589.0 13923.0\n282.0 13785.0\" | \
  gdaltransform -tps -output_xy Lat075_009_Ventspils_ca1930.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Lat075_009_Ventspils_ca1930.vrt Lat075_009_Ventspils_ca1930.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Lat075_009_Ventspils_ca1930.cut.vrt Lat075_009_Ventspils_ca1930.xyz