#!/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 3514.5 2943.3621848739494 27 56.75 -gcp 17970.0 3043.9310924369747 27.5 56.75 -gcp 17962.5 16539.625210084036 27.5 56.5 -gcp 3433.5 16447.823529411766 27 56.5 Latvijas_dalas_Lietuvas_dalas_un_Igau_6pVkUZd.kartes_Rezekne_6828_A1_L25_87_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Rezekne_6828_A1_L25_87_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"3514.5 2943.3621848739494\n17970.0 3043.9310924369747\n17962.5 16539.625210084036\n3433.5 16447.823529411766\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Rezekne_6828_A1_L25_87_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Rezekne_6828_A1_L25_87_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Rezekne_6828_A1_L25_87_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_Rezekne_6828_A1_L25_87_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Rezekne_6828_A1_L25_87_02.xyz