#!/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 834.0 2436.3058823529414 23 57.5 -gcp 14976.0 2466.7714285714287 23.5 57.5 -gcp 15007.5 15979.884033613445 23.5 57.25 -gcp 781.5 15937.851260504201 23 57.25 Latvijas_dalas_Lietuvas_dalas_un_Iga_1HevlHF.kartes_Mersrags_6828_A1_L25_25_02.JPG Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Mersrags_6828_A1_L25_25_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"834.0 2436.3058823529414\n14976.0 2466.7714285714287\n15007.5 15979.884033613445\n781.5 15937.851260504201\" | \
  gdaltransform -tps -output_xy Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Mersrags_6828_A1_L25_25_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Mersrags_6828_A1_L25_25_02.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Mersrags_6828_A1_L25_25_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_Mersrags_6828_A1_L25_25_02.cut.vrt Latvijas_dalas_Lietuvas_dalas_un_Igaunijas_top.kartes_Mersrags_6828_A1_L25_25_02.xyz