#!/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 3378.75 3276.8650639244024 22.333333333333332 56.75 -gcp 24974.25 3335.2954419121734 23.333333333333332 56.75 -gcp 25119.75 23599.994858254584 23.333333333333332 56.25 -gcp 3243.75 23540.39799888827 22.333333333333332 56.25 Latvijas_un_Lietuvas_topografiskas_kartes__Saldus_un_apkartne__6828_A1_L32_4_02.JPG Latvijas_un_Lietuvas_topografiskas_kartes__Saldus_un_apkartne__6828_A1_L32_4_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "14199.0 3345.053303720156\n3378.0 3276.0\n3327.0 13419.004997223765\n3240.0 23543.950027762352\n14181.0 23614.524153248196\n25120.5 23599.534147695726\n25041.0 13476.005830094393\n24976.5 3331.560799555802" | \
  gdaltransform -tps -output_xy Latvijas_un_Lietuvas_topografiskas_kartes__Saldus_un_apkartne__6828_A1_L32_4_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Lietuvas_topografiskas_kartes__Saldus_un_apkartne__6828_A1_L32_4_02.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Saldus_un_apkartne__6828_A1_L32_4_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__Saldus_un_apkartne__6828_A1_L32_4_02.cut.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Saldus_un_apkartne__6828_A1_L32_4_02.xyz