#!/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 1137.0 1008.0 21 57 -gcp 11832.0 1032.0 22.483333333333334 57 -gcp 11949.0 14151.0 22.483333333333334 56 -gcp 957.0 14157.0 21 56 41_Liepaja_1940.jpg 41_Liepaja_1940.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"774.0 1005.0\n590.25 14157.748750694058\n12051.0 14153.063645197115\n11925.0 1031.2495835646862\" | \
  gdaltransform -tps -output_xy 41_Liepaja_1940.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  41_Liepaja_1940.vrt 41_Liepaja_1940.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 41_Liepaja_1940.cut.vrt 41_Liepaja_1940.xyz