#!/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 789.0 894.0 25.5 57 -gcp 11493.0 936.0 27 57 -gcp 11607.0 14070.0 27 56 -gcp 615.0 14043.0 25.5 56 44_Jekabpils_1931.jpg 44_Jekabpils_1931.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"789.0 894.0\n615.0 14044.12562465297\n11609.625 14072.626457523598\n11495.625 935.2462520821766\" | \
  gdaltransform -tps -output_xy 44_Jekabpils_1931.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  44_Jekabpils_1931.vrt 44_Jekabpils_1931.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 44_Jekabpils_1931.cut.vrt 44_Jekabpils_1931.xyz