#!/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 1878.0 2316.559663865546 26.5 56.75 -gcp 16242.0 2410.3310924369744 27 56.75 -gcp 16269.0 14210.611764705882 26.999588012695316 56.52777777777778 -gcp 1903.5 14271.268907563024 26.5 56.52777777777778 Latvijas_dalas_Lietuvas_dalas_un_Ig_lQEzEfR.kartes_Varaklani_6828_A1_L25_78_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Varaklani_6828_A1_L25_78_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1878.0 2316.559663865546\n16242.0 2410.3310924369744\n16263.0 15510.021848739496\n15507.0 15548.994957983194\n14409.0 15527.984873949581\n13806.0 15527.993277310925\n13692.0 15401.915966386554\n12840.0 15654.04705882353\n9210.0 15647.989915966387\n9186.0 15551.939495798319\n8703.0 15672.008403361346\n8136.0 15666.0\n1926.0 15689.979831932775\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Varaklani_6828_A1_L25_78_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Varaklani_6828_A1_L25_78_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Varaklani_6828_A1_L25_78_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Varaklani_6828_A1_L25_78_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Varaklani_6828_A1_L25_78_02.xyz