#!/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 23.29699535927615 57.2258312767829 -gcp 16833.0 0.0 24.857738497098904 57.09835334655311 -gcp 16833.0 15237.0 24.623031940586696 56.34501181494352 -gcp 0.0 15237.0 23.0970114336435 56.482888473139134 Viduseuropas_specialas_topografiskas_kartes_Riga__6828_A1_L43_13_02.JPG Viduseuropas_specialas_topografiskas_kartes_Riga__6828_A1_L43_13_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 -cutline "POLYGON((836 1083, 844 3885, 4830 3884, 4816 1086, 836 1083))" Viduseuropas_specialas_topografiskas_kartes_Riga__6828_A1_L43_13_02.vrt Viduseuropas_specialas_topografiskas_kartes_Riga__6828_A1_L43_13_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_Riga__6828_A1_L43_13_02.cut.vrt Viduseuropas_specialas_topografiskas_kartes_Riga__6828_A1_L43_13_02.xyz