#!/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 1866.0 2703.368907563025 23.5 56.75 -gcp 16240.5 2721.1827731092435 24 56.75 -gcp 16315.5 16168.747478991596 24 56.5 -gcp 1842.75 16167.18487394958 23.5 56.5 Latvijas_dalas_Lietuvas_dalas_un_Igau_c1JdH31.kartes_Jelgava_6828_A1_L25_31_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Jelgava_6828_A1_L25_31_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1866.0 2703.368907563025\n16240.5 2721.1827731092435\n16315.5 16168.747478991596\n1842.75 16167.18487394958\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Jelgava_6828_A1_L25_31_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Jelgava_6828_A1_L25_31_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Jelgava_6828_A1_L25_31_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_Jelgava_6828_A1_L25_31_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Jelgava_6828_A1_L25_31_02.xyz