#!/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 1476.386964448496 1860.183257918552 23.1266666 56.75 -gcp 11235.466271649955 1956.236802413273 23.5766666 56.75 -gcp 11230.702370100273 12106.753770739064 23.5766666 56.5 -gcp 1447.5 11995.876876042246 23.1266666 56.5 Latvijas_topografiskas_kartes_Dobeles_apkartne__6828_A1_L30_2_02.JPG Latvijas_topografiskas_kartes_Dobeles_apkartne__6828_A1_L30_2_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1473.3346627164997 1857.0165912518855\n11238.386964448495 1954.5081070889896\n11231.184366453965 12107.315987933634\n1443.052643573382 11998.46568627451" | \
  gdaltransform -tps -output_xy Latvijas_topografiskas_kartes_Dobeles_apkartne__6828_A1_L30_2_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_topografiskas_kartes_Dobeles_apkartne__6828_A1_L30_2_02.vrt Latvijas_topografiskas_kartes_Dobeles_apkartne__6828_A1_L30_2_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_topografiskas_kartes_Dobeles_apkartne__6828_A1_L30_2_02.cut.vrt Latvijas_topografiskas_kartes_Dobeles_apkartne__6828_A1_L30_2_02.xyz