#!/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 2431.5 2649.176764869372 22.333333333333332 56.25 -gcp 24342.0 2748.807531962201 23.333333333333332 56.25 -gcp 24495.0 22953.428571428572 23.333333333333332 55.75 -gcp 2282.25 22869.20052807115 22.333333333333332 55.75 Latvijas_un_Lietuvas_topografiskas_kartes__Sauli_un_apkartne__6828_A1_L32_6_02.JPG Latvijas_un_Lietuvas_topografiskas_kartes__Sauli_un_apkartne__6828_A1_L32_6_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "13387.5 2736.0091615769015\n2430.0 2648.975013881177\n2346.0 12765.003331482509\n2280.0 22869.0\n13381.5 22968.030816213217\n24495.0 22956.0\n24400.5 12852.000832870628\n24346.5 2746.4375347029427" | \
  gdaltransform -tps -output_xy Latvijas_un_Lietuvas_topografiskas_kartes__Sauli_un_apkartne__6828_A1_L32_6_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Lietuvas_topografiskas_kartes__Sauli_un_apkartne__6828_A1_L32_6_02.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Sauli_un_apkartne__6828_A1_L32_6_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_un_Lietuvas_topografiskas_kartes__Sauli_un_apkartne__6828_A1_L32_6_02.cut.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Sauli_un_apkartne__6828_A1_L32_6_02.xyz