#!/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 1832.25 2400.10756302521 26 56 -gcp 16507.5 2395.8302521008404 26.5 56 -gcp 16627.5 19444.62268907563 26.5 55.68333333333333 -gcp 1833.0 19467.21512605042 26 55.68333333333333 Latvijas_dalas_Lietuvas_dalas_un_Igau_NbUZrKG.kartes_Ilukste_6828_A1_L25_74_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Ilukste_6828_A1_L25_74_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1832.25 2400.10756302521\n16507.5 2395.8302521008404\n16627.5 19444.62268907563\n1833.0 19467.21512605042\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Ilukste_6828_A1_L25_74_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Ilukste_6828_A1_L25_74_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Ilukste_6828_A1_L25_74_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_Ilukste_6828_A1_L25_74_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Ilukste_6828_A1_L25_74_02.xyz