#!/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 1702.5 2508.2915966386554 22.5 57 -gcp 16005.0 2583.4260504201684 23 57 -gcp 16021.5 16029.327731092435 23 56.75 -gcp 1614.0 15938.313445378151 22.5 56.75 Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Zemite_6828_A1_L25_22_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Zemite_6828_A1_L25_22_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1702.5 2508.2915966386554\n16005.0 2583.4260504201684\n16021.5 16029.327731092435\n1614.0 15938.313445378151\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Zemite_6828_A1_L25_22_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Zemite_6828_A1_L25_22_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Zemite_6828_A1_L25_22_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_Zemite_6828_A1_L25_22_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Zemite_6828_A1_L25_22_02.xyz