#!/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 1713.3291473892928 2551.810924369748 27 57 -gcp 16014.379709187047 2574.387394957983 27.5 57 -gcp 16083.420356906809 16030.77394957983 27.5 56.75 -gcp 1665.3430270984798 16008.36386554622 27 56.75 Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Tilza_6828_A1_L25_86_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Tilza_6828_A1_L25_86_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1713.3291473892928 2551.810924369748\n16014.379709187047 2574.387394957983\n16083.420356906809 16030.77394957983\n1665.3430270984798 16008.36386554622\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Tilza_6828_A1_L25_86_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Tilza_6828_A1_L25_86_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Tilza_6828_A1_L25_86_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_Tilza_6828_A1_L25_86_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Tilza_6828_A1_L25_86_02.xyz