#!/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 2325.0 3192.0 24 58 -gcp 12789.0 3138.0 24.5 58 -gcp 12903.0 16665.0 24.5 57.666666666666664 -gcp 2352.0 16713.0 24 57.666666666666664 LVVA/Latvijas-Lietuvas_rep_un_Vitebskas_apg-Ainazi_un_apkartne_6828_A1_L34_12_02.JPG Latvijas-Lietuvas_rep_un_Vitebskas_apg-Ainazi_un_apkartne_6828_A1_L34_12_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2325.0 3192.0\n12789.0 3138.0\n12903.0 16665.0\n2352.0 16713.0" | \
  gdaltransform -tps -output_xy Latvijas-Lietuvas_rep_un_Vitebskas_apg-Ainazi_un_apkartne_6828_A1_L34_12_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas-Lietuvas_rep_un_Vitebskas_apg-Ainazi_un_apkartne_6828_A1_L34_12_02.vrt Latvijas-Lietuvas_rep_un_Vitebskas_apg-Ainazi_un_apkartne_6828_A1_L34_12_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas-Lietuvas_rep_un_Vitebskas_apg-Ainazi_un_apkartne_6828_A1_L34_12_02.cut.vrt Latvijas-Lietuvas_rep_un_Vitebskas_apg-Ainazi_un_apkartne_6828_A1_L34_12_02.xyz