#!/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 1799.25 2644.7218487394957 21 57 -gcp 16158.0 2704.7210084033613 21.5 57 -gcp 16191.0 16155.397478991596 21.5 56.75 -gcp 1743.0 16117.855462184874 21 56.75 Latvijas_dalas_Lietuvas_dalas_un_Iga_FhtZE6w.kartes_Pavilosta_6828_A1_L25_3_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Pavilosta_6828_A1_L25_3_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1799.25 2644.7218487394957\n16158.0 2704.7210084033613\n16191.0 16155.397478991596\n1743.0 16117.855462184874\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Pavilosta_6828_A1_L25_3_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Pavilosta_6828_A1_L25_3_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Pavilosta_6828_A1_L25_3_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_Pavilosta_6828_A1_L25_3_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Pavilosta_6828_A1_L25_3_02.xyz