#!/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 4626.0 2913.4402445803225 24.170550000000002 56.5 -gcp 19158.0 3031.581712062257 24.837216666666666 56.5 -gcp 19281.0 33354.708727070596 24.837216666666666 55.75 -gcp 4464.75 33342.20386325737 24.170550000000002 55.75 Liet.un_Latv.dienvidu_dalas_top.kartes_Skjazgiri-Bauska-Skaistk.6828_A1_L35_4_03.JPG Liet.un_Latv.dienvidu_dalas_top.kartes_Skjazgiri-Bauska-Skaistk.6828_A1_L35_4_03.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1530.0 2867.9983342587448\n1275.75 33333.001665741256\n10279.5 33348.75375208449\n19284.0 33351.0\n19158.0 3030.0" | \
  gdaltransform -tps -output_xy Liet.un_Latv.dienvidu_dalas_top.kartes_Skjazgiri-Bauska-Skaistk.6828_A1_L35_4_03.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_03.vrt Liet.un_Latv.dienvidu_dalas_top.kartes_Skjazgiri-Bauska-Skaistk.6828_A1_L35_4_03.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_03.cut.vrt Liet.un_Latv.dienvidu_dalas_top.kartes_Skjazgiri-Bauska-Skaistk.6828_A1_L35_4_03.xyz