#!/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 3112.5 2355.3326848249026 25.3766666 59 -gcp 21406.5 2478.2626459143967 26.2766666 59 -gcp 21516.75 32811.204280155645 26.2766666 58.25 -gcp 2891.25 32750.423846581434 25.3766666 58.25 Latvijas_un_Igaunijas_topografiskas_kartes_Veisensteina_6828_A1_L36_8_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Veisensteina_6828_A1_L36_8_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3110.25 2351.9983342587448\n2885.25 32753.629789006107\n21524.25 32814.750416435316\n21408.0 2473.4991671293724" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Veisensteina_6828_A1_L36_8_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Veisensteina_6828_A1_L36_8_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Veisensteina_6828_A1_L36_8_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_un_Igaunijas_topografiskas_kartes_Veisensteina_6828_A1_L36_8_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Veisensteina_6828_A1_L36_8_02.xyz