#!/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 1572.0 1900.929411764706 25 57.25 -gcp 15571.5 2011.8327731092436 25.5 57.25 -gcp 15630.0 15477.43193277311 25.5 57 -gcp 1534.5 15372.39411764706 25 57 Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Ieriki_6828_A1_L25_53_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Ieriki_6828_A1_L25_53_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1572.0 1900.929411764706\n15571.5 2011.8327731092436\n15630.0 15477.43193277311\n1534.5 15372.39411764706\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Ieriki_6828_A1_L25_53_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Ieriki_6828_A1_L25_53_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Ieriki_6828_A1_L25_53_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Ieriki_6828_A1_L25_53_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Ieriki_6828_A1_L25_53_02.xyz