#!/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 3681.0 3294.0 24.026666666666667 56.5 -gcp 23163.0 3333.0 24.476666666666667 56.5 -gcp 23226.0 23562.0 24.476666666666667 56.25 -gcp 3603.0 23493.0 24.026666666666667 56.25 lvva/Kurzemes,Vidzemes,Kaunas_un_Vitebskas_gubernas_Bauskas_apkartne___6828__A1_L21_02.JPG Kurzemes,Vidzemes,Kaunas_un_Vitebskas_gubernas_Bauskas_apkartne___6828__A1_L21_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3681.0 3294.0\n23163.0 3333.0\n23226.0 23562.0\n3603.0 23493.0" | \
  gdaltransform -tps -output_xy Kurzemes,Vidzemes,Kaunas_un_Vitebskas_gubernas_Bauskas_apkartne___6828__A1_L21_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Kurzemes,Vidzemes,Kaunas_un_Vitebskas_gubernas_Bauskas_apkartne___6828__A1_L21_02.vrt Kurzemes,Vidzemes,Kaunas_un_Vitebskas_gubernas_Bauskas_apkartne___6828__A1_L21_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_Bauskas_apkartne___6828__A1_L21_02.cut.vrt Kurzemes,Vidzemes,Kaunas_un_Vitebskas_gubernas_Bauskas_apkartne___6828__A1_L21_02.xyz