#!/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 3204.75 28406.503057254035 25.333333333333332 55.75 -gcp 3205.5 5658.095469705391 26.333333333333332 55.75 -gcp 22926.0 5583.112979433018 26.333333333333332 55.25 -gcp 22908.75 28606.65258476932 25.333333333333332 55.25 Latvijas_un_Lietuvas_topografiskas_kartes__Utena_un_apkartne__6828_A1_L32_10_02.JPG Latvijas_un_Lietuvas_topografiskas_kartes__Utena_un_apkartne__6828_A1_L32_10_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "13083.0 5611.484175458078\n3207.0 5658.0\n3268.5 16992.05413659078\n3205.5 28405.617434758467\n8136.0 28479.013325930042\n13065.0 28504.498334258744\n22911.0 28608.0\n22956.0 17071.521654636315\n22926.0 5583.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Lietuvas_topografiskas_kartes__Utena_un_apkartne__6828_A1_L32_10_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Lietuvas_topografiskas_kartes__Utena_un_apkartne__6828_A1_L32_10_02.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Utena_un_apkartne__6828_A1_L32_10_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_un_Lietuvas_topografiskas_kartes__Utena_un_apkartne__6828_A1_L32_10_02.cut.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Utena_un_apkartne__6828_A1_L32_10_02.xyz