#!/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 26.959458902135 57.441182201527 -gcp 10506.0 0.0 26.959045159809 57.41506404109 -gcp 10506.0 10536.0 26.910583341313 57.415573425037 -gcp 0.0 10536.0 26.910879066442 57.441402734889 Aluksne-1989-1186/Aluksne-1989-1186-57.jpg Aluksne-1989-1186-57.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1026.0 990.0\n9456.75 966.0\n9478.5 9379.5\n1008.0 9402.0" | \
  gdaltransform -tps -output_xy Aluksne-1989-1186-57.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Aluksne-1989-1186-57.vrt Aluksne-1989-1186-57.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Aluksne-1989-1186-57.cut.vrt Aluksne-1989-1186-57.xyz