#!/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 3193.431558935353 7446.602661596955 21.337216666666666 57.5 -gcp 19153.5 4951.556561085972 24.337216666666666 57.75 -gcp 19237.5 12391.598039215687 24.337216666666666 57 -gcp 3106.5 12384.156108597284 21.337216666666666 57 NLL241_Latvijas_satiksmes_ceļu_karte_1928-k_001_ktl1-3-124_1.jpg NLL241_Latvijas_satiksmes_ceļu_karte_1928-k_001_ktl1-3-124_1.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "20844.0 1396.5995475113123\n915.0 1338.0\n687.0 13830.0\n20994.0 13755.0" | \
  gdaltransform -tps -output_xy NLL241_Latvijas_satiksmes_ceļu_karte_1928-k_001_ktl1-3-124_1.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  NLL241_Latvijas_satiksmes_ceļu_karte_1928-k_001_ktl1-3-124_1.vrt NLL241_Latvijas_satiksmes_ceļu_karte_1928-k_001_ktl1-3-124_1.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES NLL241_Latvijas_satiksmes_ceļu_karte_1928-k_001_ktl1-3-124_1.cut.vrt NLL241_Latvijas_satiksmes_ceļu_karte_1928-k_001_ktl1-3-124_1.xyz