#!/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 1878.0 2227.9143968871595 24.0266666 57.416666666666664 -gcp 30474.0 2685.3410227904387 25.3766666 57.416666666666664 -gcp 30448.5 39820.81851028349 25.3766666 56.5 -gcp 981.0 39381.39605336298 24.0266666 56.5 Latvijas_un_Igaunijas_topografiskas_kartes_Riga_6828_A1_L36_18_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Riga_6828_A1_L36_18_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "16162.5 2523.412687395891\n1875.0 2226.0\n1395.0 20808.00249861188\n980.25 39380.25124930594\n15745.5 39678.04330927263\n30447.0 39819.0\n30501.0 21265.50749583565\n30474.0 2685.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Riga_6828_A1_L36_18_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Riga_6828_A1_L36_18_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Riga_6828_A1_L36_18_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_Riga_6828_A1_L36_18_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Riga_6828_A1_L36_18_02.xyz