#!/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 2695.5 3748.6959421901056 26.2766666 57 -gcp 22011.0 3738.411895497499 27.1766666 57 -gcp 22124.25 23950.628821567538 27.1766666 56.5 -gcp 2518.756442120766 23991.315655027087 26.2766666 56.5 Latvijas_un_Igaunijas_topografiskas_kartes_Vilani_6828_A1_L36_20_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Vilani_6828_A1_L36_20_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "12348.0 3731.993337034981\n2697.0 3750.0\n2601.75 13866.748334258746\n2515.5 23989.50749583565\n12303.0 23975.287062742922\n22126.5 23949.06829539145\n22074.0 13858.542476401999\n22011.0 3738.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Vilani_6828_A1_L36_20_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Vilani_6828_A1_L36_20_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Vilani_6828_A1_L36_20_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_Vilani_6828_A1_L36_20_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Vilani_6828_A1_L36_20_02.xyz