#!/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 1830.0 2685.249579831933 21 57.5 -gcp 15978.0 2737.9058823529413 21.5 57.5 -gcp 16018.5 16228.979831932773 21.5 57.25 -gcp 1779.0 16183.849579831935 21 57.25 Latvijas_dalas_Lietuvas_dalas_un_Igau_CE2yToP.kartes_Libciems_6828_A1_L25_1_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Libciems_6828_A1_L25_1_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1830.0 2685.249579831933\n15978.0 2737.9058823529413\n16018.5 16228.979831932773\n1779.0 16183.849579831935\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Libciems_6828_A1_L25_1_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Libciems_6828_A1_L25_1_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Libciems_6828_A1_L25_1_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_Libciems_6828_A1_L25_1_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Libciems_6828_A1_L25_1_02.xyz