#!/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 2898.0 3067.7426347971095 26.2766666 57.583333333333336 -gcp 21975.0 3208.8268482490275 27.1766666 57.583333333333336 -gcp 22071.0 26760.362701500835 27.1766666 57 -gcp 2659.0184201026786 26662.529874708354 26.2766666 57 Latvijas_un_Igaunijas_topografiskas_kartes_Aluksne_6828_A1_L36_15_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Aluksne_6828_A1_L36_15_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "12420.0 3130.1206274292063\n2894.25 3065.2479178234316\n2764.5 14839.485008328706\n2657.25 26663.33620210994\n12357.0 26725.550805108272\n22067.25 26760.672126596335\n21975.0 3207.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Aluksne_6828_A1_L36_15_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Aluksne_6828_A1_L36_15_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Aluksne_6828_A1_L36_15_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_Aluksne_6828_A1_L36_15_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Aluksne_6828_A1_L36_15_02.xyz