#!/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 1798.5 2161.689075630252 24.5 58 -gcp 15516.0 2295.766386554622 25 58 -gcp 15513.117494825781 15647.181608601015 25 57.75 -gcp 1765.5 15477.536134453781 24.5 57.75 Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Aloja_6828_A1_L25_42_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Aloja_6828_A1_L25_42_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1768.5 8816.99831932773\n1798.5 2161.689075630252\n8643.0 2238.0050420168072\n15516.0 2295.766386554622\n15540.0 8928.006722689075\n15517.5 15538.578151260503\n15438.0 15646.5\n8613.0 15545.991596638654\n1765.5 15477.536134453781\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Aloja_6828_A1_L25_42_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Aloja_6828_A1_L25_42_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Aloja_6828_A1_L25_42_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_Aloja_6828_A1_L25_42_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Aloja_6828_A1_L25_42_02.xyz