#!/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 1729.5 2875.718487394958 27.5 56.25 -gcp 16299.0 2910.5319327731095 28 56.25 -gcp 16348.5 16381.796638655462 28 56 -gcp 1657.5 16345.73025210084 27.5 56 Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Dagda_6828_A1_L25_97_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Dagda_6828_A1_L25_97_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1729.5 2875.718487394958\n16299.0 2910.5319327731095\n16348.5 16381.796638655462\n1657.5 16345.73025210084\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Dagda_6828_A1_L25_97_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Dagda_6828_A1_L25_97_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Dagda_6828_A1_L25_97_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_Dagda_6828_A1_L25_97_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Dagda_6828_A1_L25_97_02.xyz