#!/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 588.0 879.0 23.25 57.166666666666664 -gcp 12237.0 837.0 23.521166666666666 57.166666666666664 -gcp 12339.0 13947.0 23.521166666666666 57 -gcp 630.0 13995.0 23.25 57 mapster/RKKA050_O-34-107-D_Apshuciems_1939_greif.jpg RKKA050_O-34-107-D_Apshuciems_1939_greif.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "588.0 879.0\n12237.0 837.0\n12339.0 13947.0\n630.0 13995.0" | \
  gdaltransform -tps -output_xy RKKA050_O-34-107-D_Apshuciems_1939_greif.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  RKKA050_O-34-107-D_Apshuciems_1939_greif.vrt RKKA050_O-34-107-D_Apshuciems_1939_greif.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES RKKA050_O-34-107-D_Apshuciems_1939_greif.cut.vrt RKKA050_O-34-107-D_Apshuciems_1939_greif.xyz