#!/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 1948.5 2958.19010561423 24.3266666 58.25 -gcp 23664.0 3001.775986659255 25.3766666 58.25 -gcp 23958.0 29964.40605892162 25.3766666 57.583333333333336 -gcp 1736.25 29976.214702612564 24.3266666 57.583333333333336 Latvijas_un_Igaunijas_topografiskas_kartes_Hedemeste_6828_A1_L36_10_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Hedemeste_6828_A1_L36_10_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "12816.75 3017.2712382009995\n1947.0 2958.0\n1830.75 16483.509578012217\n1735.5 29973.750416435312\n12850.5 30001.519156024435\n23958.0 29961.0\n23802.75 16460.23875624653\n23661.0 3000.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Hedemeste_6828_A1_L36_10_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Hedemeste_6828_A1_L36_10_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Hedemeste_6828_A1_L36_10_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_Hedemeste_6828_A1_L36_10_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Hedemeste_6828_A1_L36_10_02.xyz