#!/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 3834.0 4572.276820455809 27 60 -gcp 33153.0 4260.5769872151195 27.75 60 -gcp 33591.0 43542.98721511951 27.75 59.5 -gcp 3816.0 43839.9155086159 27 59.5 mapster/Estland-Lettland_100K_15_Narva_NW_III.1941_ungueltig_nnxV40t_Sygn.ZZK_S-20_192_A_0001.jpg Estland-Lettland_100K_15_Narva_NW_III.1941_ungueltig_nnxV40t_Sygn.ZZK_S-20_192_A_0001.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3834.0 4572.276820455809\n33153.0 4260.5769872151195\n33591.0 43542.98721511951\n3816.0 43839.9155086159" | \
  gdaltransform -tps -output_xy Estland-Lettland_100K_15_Narva_NW_III.1941_ungueltig_nnxV40t_Sygn.ZZK_S-20_192_A_0001.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Estland-Lettland_100K_15_Narva_NW_III.1941_ungueltig_nnxV40t_Sygn.ZZK_S-20_192_A_0001.vrt Estland-Lettland_100K_15_Narva_NW_III.1941_ungueltig_nnxV40t_Sygn.ZZK_S-20_192_A_0001.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Estland-Lettland_100K_15_Narva_NW_III.1941_ungueltig_nnxV40t_Sygn.ZZK_S-20_192_A_0001.cut.vrt Estland-Lettland_100K_15_Narva_NW_III.1941_ungueltig_nnxV40t_Sygn.ZZK_S-20_192_A_0001.xyz