#!/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 3180.0 39367.122707059476 20.833333333333332 55.75 -gcp 3310.5 5296.5450250138965 22.333333333333332 55.75 -gcp 22938.75 5196.844635908838 22.333333333333332 55.25 -gcp 22824.0 39708.34727626459 20.833333333333332 55.25 Latvijas_un_Lietuvas_topografiskas_kartes__Memele_un_apkartne__6828_A1_L32_1_02.JPG Latvijas_un_Lietuvas_topografiskas_kartes__Memele_un_apkartne__6828_A1_L32_1_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "13124.0625 5243.439686285397\n3307.125 5293.879372570794\n3328.5 22329.00249861188\n3177.75 39364.49916712937\n13002.0 39549.00666296502\n22824.0 39708.0\n22959.0 22458.00333148251\n22941.0 5193.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Lietuvas_topografiskas_kartes__Memele_un_apkartne__6828_A1_L32_1_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Lietuvas_topografiskas_kartes__Memele_un_apkartne__6828_A1_L32_1_02.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Memele_un_apkartne__6828_A1_L32_1_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__Memele_un_apkartne__6828_A1_L32_1_02.cut.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Memele_un_apkartne__6828_A1_L32_1_02.xyz