#!/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 1338.0 2358.310924369748 20.966666666666665 56.5 -gcp 16837.5 2467.9840336134453 21.5 56.5 -gcp 16821.0 15957.15462184874 21.5 56.25 -gcp 1239.0 15852.227731092436 20.966666666666665 56.25 Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Barta_6828_A1_L25_5_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Barta_6828_A1_L25_5_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1338.0 2358.310924369748\n16837.5 2467.9840336134453\n16821.0 15957.15462184874\n1239.0 15852.227731092436\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Barta_6828_A1_L25_5_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Barta_6828_A1_L25_5_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Barta_6828_A1_L25_5_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_Barta_6828_A1_L25_5_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Barta_6828_A1_L25_5_02.xyz