#!/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 1980.0 2859.1309060589215 27.1766666 59.8 -gcp 24754.5 2817.181767648694 28.3266666 59.8 -gcp 25284.0 39219.454419121736 28.3266666 58.9 -gcp 1926.0 39279.323513062816 27.1766666 58.9 Latvijas_un_Igaunijas_topografiskas_kartes_Narva_6828_A1_L36_5_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Narva_6828_A1_L36_5_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1977.0 2855.2495835646864\n1909.5 21090.01249305941\n1926.75 39279.001665741256\n25284.0 39219.0\n25009.5 21024.004164353137\n24753.0 2814.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Narva_6828_A1_L36_5_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Narva_6828_A1_L36_5_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Narva_6828_A1_L36_5_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_Narva_6828_A1_L36_5_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Narva_6828_A1_L36_5_02.xyz