#!/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 1768.5 1984.7537815126052 26 58 -gcp 15529.5 2136.470588235294 26.5 58 -gcp 15606.27150532378 15467.19805735712 26.5 57.75 -gcp 1669.5 15376.887394957983 26 57.75 Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Valka_6828_A1_L25_67_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Valka_6828_A1_L25_67_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1768.5 1984.7537815126052\n15529.5 2136.470588235294\n15606.27150532378 15467.19805735712\n1669.5 15376.887394957983\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Valka_6828_A1_L25_67_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Valka_6828_A1_L25_67_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Valka_6828_A1_L25_67_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_Valka_6828_A1_L25_67_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Valka_6828_A1_L25_67_02.xyz