#!/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 2229.0 2712.3001667593107 26.2766666 58.25 -gcp 21003.0 2880.637020566982 27.1766666 58.25 -gcp 21009.0 29892.54030016676 27.1766666 57.583333333333336 -gcp 1919.099138478064 29692.655046512315 26.2766666 57.583333333333336 Latvijas_un_Igaunijas_topografiskas_kartes_Veru_6828_A1_L36_12_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Veru_6828_A1_L36_12_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "11604.75 2794.5008328706276\n2229.0 2709.0\n2067.375 16181.2393808995\n1913.25 29691.750416435312\n11471.25 29799.378956135482\n21007.5 29892.747084952804\n21010.5 16399.50812048862\n21000.0 2877.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Veru_6828_A1_L36_12_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Veru_6828_A1_L36_12_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Veru_6828_A1_L36_12_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_Veru_6828_A1_L36_12_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Veru_6828_A1_L36_12_02.xyz