#!/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 3505.5 38849.55600333519 20.833333333333332 56.25 -gcp 3672.0 5228.383407448582 22.333333333333332 56.25 -gcp 23178.19891838296 5139.271347494719 22.333333333333332 55.75 -gcp 23140.69891838296 39168.90711736686 20.833333333333332 55.75 Latvijas_un_Lietuvas_topografiskas_kartes__Telsi_un_apkartne__6828_A1_L32_2_02.JPG Latvijas_un_Lietuvas_topografiskas_kartes__Telsi_un_apkartne__6828_A1_L32_2_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "13370.25 5223.02248750694\n3675.0 5226.0\n3661.5 22461.245696835093\n3504.0 38850.0\n23145.0 39167.878400888396\n23224.5 22746.183231538034\n23178.0 5139.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Lietuvas_topografiskas_kartes__Telsi_un_apkartne__6828_A1_L32_2_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Lietuvas_topografiskas_kartes__Telsi_un_apkartne__6828_A1_L32_2_02.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Telsi_un_apkartne__6828_A1_L32_2_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__Telsi_un_apkartne__6828_A1_L32_2_02.cut.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Telsi_un_apkartne__6828_A1_L32_2_02.xyz