#!/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 3190.5 2859.1992773763204 23.333333333333332 56.75 -gcp 24803.25 2964.830878265703 24.333333333333332 56.75 -gcp 24888.0 23254.7067815453 24.333333333333332 56.25 -gcp 2978.625 23114.671379933294 23.333333333333332 56.25 Latvijas_un_Lietuvas_topografiskas_kartes__Jelgava_un_apkartne__6828_A1_L32_5_02.JPG Latvijas_un_Lietuvas_topografiskas_kartes__Jelgava_un_apkartne__6828_A1_L32_5_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "14058.0 2937.0133259300387\n3186.0 2860.4858411993337\n3093.0 12987.0\n2977.5 23115.004997223765\n13929.0 23232.026651860077\n24888.0 23253.028317601333\n24846.0 13108.514158800665\n24804.0 2964.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Lietuvas_topografiskas_kartes__Jelgava_un_apkartne__6828_A1_L32_5_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Lietuvas_topografiskas_kartes__Jelgava_un_apkartne__6828_A1_L32_5_02.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Jelgava_un_apkartne__6828_A1_L32_5_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__Jelgava_un_apkartne__6828_A1_L32_5_02.cut.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Jelgava_un_apkartne__6828_A1_L32_5_02.xyz