#!/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 1749.0 2611.8075630252097 25 57 -gcp 16045.5 2598.368907563025 25.5 57 -gcp 16138.5 16059.308403361345 25.5 56.75 -gcp 1764.0 16059.371428571429 25 56.75 Latvijas_dalas_Lietuvas_dalas_un_Iga_sQ1tuWc.kartes_Madliena_6828_A1_L25_54_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Madliena_6828_A1_L25_54_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1749.0 2611.8075630252097\n16045.5 2598.368907563025\n16138.5 16059.308403361345\n1764.0 16059.371428571429\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Madliena_6828_A1_L25_54_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Madliena_6828_A1_L25_54_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Madliena_6828_A1_L25_54_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_Madliena_6828_A1_L25_54_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Madliena_6828_A1_L25_54_02.xyz