#!/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 3975.0 3136.587131739856 24.837216666666666 56.5 -gcp 14882.25 3141.8117009449693 25.337216666666666 56.5 -gcp 14901.0 33636.576987215114 25.337216666666666 55.75 -gcp 3846.0 33555.164674819345 24.837216666666666 55.75 Liet.un_Latv.dienvidu_dalas_top.kartes_Lielzalve-Birzi-Jekabp._6828_A1_L35_3_02.JPG Liet.un_Latv.dienvidu_dalas_top.kartes_Lielzalve-Birzi-Jekabp._6828_A1_L35_3_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "12921.0 3142.5099944475296\n3973.5 3134.2479178234316\n3939.0 18351.00333148251\n3843.75 33555.750416435316\n12957.0 33624.02165463631\n22068.0 33616.52581898945\n21822.0 3114.0483064963905" | \
  gdaltransform -tps -output_xy Liet.un_Latv.dienvidu_dalas_top.kartes_Lielzalve-Birzi-Jekabp._6828_A1_L35_3_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Liet.un_Latv.dienvidu_dalas_top.kartes_Lielzalve-Birzi-Jekabp._6828_A1_L35_3_02.vrt Liet.un_Latv.dienvidu_dalas_top.kartes_Lielzalve-Birzi-Jekabp._6828_A1_L35_3_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_Lielzalve-Birzi-Jekabp._6828_A1_L35_3_02.cut.vrt Liet.un_Latv.dienvidu_dalas_top.kartes_Lielzalve-Birzi-Jekabp._6828_A1_L35_3_02.xyz