#!/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 4515.0 3852.2101167315177 21 57.5 -gcp 36852.0 3849.680377987771 21.75 57.5 -gcp 36892.5 43488.257643135075 21.75 57 -gcp 4534.5 43362.30516953864 21 57 mapster/Estland-Lettland_100K_31_SW_Ventspils_(Windau)_III.1941_nnv8n80_BN_Sygn._ZZK_S-20_201_A_0001.jpg Estland-Lettland_100K_31_SW_Ventspils_(Windau)_III.1941_nnv8n80_BN_Sygn._ZZK_S-20_201_A_0001.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "4515.0 3852.2101167315177\n36852.0 3849.680377987771\n36892.5 43488.257643135075\n4534.5 43362.30516953864" | \
  gdaltransform -tps -output_xy Estland-Lettland_100K_31_SW_Ventspils_(Windau)_III.1941_nnv8n80_BN_Sygn._ZZK_S-20_201_A_0001.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Estland-Lettland_100K_31_SW_Ventspils_(Windau)_III.1941_nnv8n80_BN_Sygn._ZZK_S-20_201_A_0001.vrt Estland-Lettland_100K_31_SW_Ventspils_(Windau)_III.1941_nnv8n80_BN_Sygn._ZZK_S-20_201_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_31_SW_Ventspils_(Windau)_III.1941_nnv8n80_BN_Sygn._ZZK_S-20_201_A_0001.cut.vrt Estland-Lettland_100K_31_SW_Ventspils_(Windau)_III.1941_nnv8n80_BN_Sygn._ZZK_S-20_201_A_0001.xyz