#!/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 4043.25 2802.8413007226236 23.337216666666666 56.5 -gcp 22230.0 2899.7167871039464 24.170550000000002 56.5 -gcp 22244.814722825613 33367.72036235637 24.170550000000002 55.75 -gcp 3787.875 33216.84234296832 23.337216666666666 55.75 Liet.un_Latv.dienvidu_dalas_top.kartes_Skjazgiri-Bauska-Skaistk.6828_A1_L35_4_02.JPG Liet.un_Latv.dienvidu_dalas_top.kartes_Skjazgiri-Bauska-Skaistk.6828_A1_L35_4_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "13143.0 2877.0149916712935\n4041.9375 2800.4991671293724\n3920.25 18006.74875069406\n3785.625 33216.37520821766\n13068.0 33318.0149916713\n22326.0 33364.49916712937\n22251.0 2897.9983342587448" | \
  gdaltransform -tps -output_xy Liet.un_Latv.dienvidu_dalas_top.kartes_Skjazgiri-Bauska-Skaistk.6828_A1_L35_4_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Liet.un_Latv.dienvidu_dalas_top.kartes_Skjazgiri-Bauska-Skaistk.6828_A1_L35_4_02.vrt Liet.un_Latv.dienvidu_dalas_top.kartes_Skjazgiri-Bauska-Skaistk.6828_A1_L35_4_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Liet.un_Latv.dienvidu_dalas_top.kartes_Skjazgiri-Bauska-Skaistk.6828_A1_L35_4_02.cut.vrt Liet.un_Latv.dienvidu_dalas_top.kartes_Skjazgiri-Bauska-Skaistk.6828_A1_L35_4_02.xyz