#!/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 3157.5 39221.64813785436 20.833333333333332 56.75 -gcp 3462.75 5986.551278488048 22.333333333333332 56.75 -gcp 23122.5 6036.856725958866 22.333333333333332 56.25 -gcp 22810.5 39668.62145636465 20.833333333333332 56.25 Latvijas_un_Lietuvas_topografiskas_kartes__Liepaja_un_apkartne__6828_A1_L32_3_02.JPG Latvijas_un_Lietuvas_topografiskas_kartes__Liepaja_un_apkartne__6828_A1_L32_3_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "13293.0 6009.712104386452\n3462.0 5985.0149916712935\n3363.0 22839.130760688506\n3156.0 39222.0\n12984.0 39456.03997779012\n22812.0 39666.066629650195\n23043.0 19649.968350916155\n23046.0 14208.759578012217\n22998.0 8801.267073847863\n23130.0 6968.750138811772\n23124.0 6034.409217101611" | \
  gdaltransform -tps -output_xy Latvijas_un_Lietuvas_topografiskas_kartes__Liepaja_un_apkartne__6828_A1_L32_3_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Lietuvas_topografiskas_kartes__Liepaja_un_apkartne__6828_A1_L32_3_02.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Liepaja_un_apkartne__6828_A1_L32_3_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_un_Lietuvas_topografiskas_kartes__Liepaja_un_apkartne__6828_A1_L32_3_02.cut.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Liepaja_un_apkartne__6828_A1_L32_3_02.xyz