#!/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 771.0 933.0 22.5 57 -gcp 11490.0 939.0 24 57 -gcp 11619.0 14097.0 24 56 -gcp 627.0 14076.0 22.5 56 42_Jelgava_1939.jpg 42_Jelgava_1939.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"771.75 933.0\n628.125 14075.624791782344\n11620.125 14098.12562465297\n11491.5 940.8743753470294\" | \
  gdaltransform -tps -output_xy 42_Jelgava_1939.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  42_Jelgava_1939.vrt 42_Jelgava_1939.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 42_Jelgava_1939.cut.vrt 42_Jelgava_1939.xyz