#!/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 3126.0 2832.0 26.276666666666667 56.25 -gcp 12603.0 2820.0 26.493333333333332 56.25 -gcp 12696.0 23028.0 26.493333333333332 56 -gcp 3177.0 23031.0 26.276666666666667 56 lvva/Kurzemes,Vidzemes,Kaunas_un_Vitebskas_gubernas_Dvietes_apkartne__6828_A1_L22_48_02.JPG Kurzemes,Vidzemes,Kaunas_un_Vitebskas_gubernas_Dvietes_apkartne__6828_A1_L22_48_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3126.0 2832.0\n16602.0 2796.0\n16584.0 23022.0\n9873.0 23034.004164353137\n3177.0 23031.0" | \
  gdaltransform -tps -output_xy Kurzemes,Vidzemes,Kaunas_un_Vitebskas_gubernas_Dvietes_apkartne__6828_A1_L22_48_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Kurzemes,Vidzemes,Kaunas_un_Vitebskas_gubernas_Dvietes_apkartne__6828_A1_L22_48_02.vrt Kurzemes,Vidzemes,Kaunas_un_Vitebskas_gubernas_Dvietes_apkartne__6828_A1_L22_48_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Kurzemes,Vidzemes,Kaunas_un_Vitebskas_gubernas_Dvietes_apkartne__6828_A1_L22_48_02.cut.vrt Kurzemes,Vidzemes,Kaunas_un_Vitebskas_gubernas_Dvietes_apkartne__6828_A1_L22_48_02.xyz