#!/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 3265.5 2919.1175653140635 25.3766666 58.25 -gcp 21951.0 3097.11061700945 26.2766666 58.25 -gcp 21987.884600901143 30134.109104594816 26.2766666 57.583333333333336 -gcp 2967.0 29964.591995553084 25.3766666 57.583333333333336 Latvijas_un_Igaunijas_topografiskas_kartes_Valka_6828_A1_L36_14_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Valka_6828_A1_L36_14_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "12594.0 3027.0124930594116\n3264.0 2916.0\n3097.5 16446.00333148251\n2964.0 29963.998334258744\n12472.5 30076.516657412547\n21990.0 30130.50083287063\n21964.5 16600.49333703498\n21945.0 3093.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Valka_6828_A1_L36_14_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Valka_6828_A1_L36_14_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Valka_6828_A1_L36_14_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_Valka_6828_A1_L36_14_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Valka_6828_A1_L36_14_02.xyz