#!/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 2694.0 2982.3351862145637 27.1766666 57.583333333333336 -gcp 22869.0 3373.99694274597 28.1266666 57.583333333333336 -gcp 22738.382539087524 26905.875140233093 28.1266666 57 -gcp 2235.0 26562.38938299055 27.1766666 57 Latvijas_un_Igaunijas_topografiskas_kartes_Vilaka_6828_A1_L36_13_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Vilaka_6828_A1_L36_13_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "12778.875 3182.626457523598\n2691.0 2985.0\n2445.0 14778.00249861188\n2233.5 26561.998334258744\n12486.75 26739.754164353137\n22734.75 26902.874375347033\n22801.875 15138.937187673517\n22869.0 3375.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Vilaka_6828_A1_L36_13_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Vilaka_6828_A1_L36_13_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Vilaka_6828_A1_L36_13_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_Vilaka_6828_A1_L36_13_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Vilaka_6828_A1_L36_13_02.xyz