#!/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 0.0 0.0 24.25535845535499 56.71268022831913 -gcp 17010.0 0.0 25.808175218993963 56.567583587989624 -gcp 17010.0 15237.0 25.57330746292024 55.82803471783773 -gcp 0.0 15237.0 24.04757418310508 55.96666711505898 Viduseuropas_specialas_topografiskas_kartes_Birzi__6828_A1_L43_18_02.JPG Viduseuropas_specialas_topografiskas_kartes_Birzi__6828_A1_L43_18_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 -cutline "POLYGON((887 1003, 875 3810, 4855 3827, 4861 1019, 887 1003))" Viduseuropas_specialas_topografiskas_kartes_Birzi__6828_A1_L43_18_02.vrt Viduseuropas_specialas_topografiskas_kartes_Birzi__6828_A1_L43_18_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Viduseuropas_specialas_topografiskas_kartes_Birzi__6828_A1_L43_18_02.cut.vrt Viduseuropas_specialas_topografiskas_kartes_Birzi__6828_A1_L43_18_02.xyz