#!/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 2797.5 2542.9719288493607 26.2766666 59 -gcp 21091.5 2377.7751528627014 27.1766666 59 -gcp 21534.0 32712.436075597554 27.1766666 58.25 -gcp 2901.0 32850.35102834908 26.2766666 58.25 Latvijas_un_Igaunijas_topografiskas_kartes_Terbata_6828_A1_L36_9_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Terbata_6828_A1_L36_9_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2797.5 2542.5024986118824\n2900.25 32847.750416435316\n21537.0 32708.99500277624\n21391.5 22588.527484730705\n22776.75 22570.860008328706\n22689.0 16524.75124930594\n21312.0 16551.23320377568\n21090.0 2381.2479178234316" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Terbata_6828_A1_L36_9_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Terbata_6828_A1_L36_9_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Terbata_6828_A1_L36_9_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_Terbata_6828_A1_L36_9_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Terbata_6828_A1_L36_9_02.xyz