#!/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 2846.267921961065 2563.4197623024356 26.2766666 59.583333333333336 -gcp 20724.0 2388.5619788771537 27.1766666 59.583333333333336 -gcp 21138.81717197079 25989.001281085322 27.1766666 59 -gcp 2889.0 26145.707059477485 26.2766666 59 Latvijas_un_Igaunijas_topografiskas_kartes_Vezenberga_6828_A1_L36_4_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Vezenberga_6828_A1_L36_4_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2847.0 2565.0\n2884.875 26146.50083287063\n21136.5 25987.504164353137\n20724.0 2388.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Vezenberga_6828_A1_L36_4_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Vezenberga_6828_A1_L36_4_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Vezenberga_6828_A1_L36_4_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_un_Igaunijas_topografiskas_kartes_Vezenberga_6828_A1_L36_4_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Vezenberga_6828_A1_L36_4_02.xyz