#!/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 2326.5 33335.08115619789 24.0266666 57 -gcp 2299.5 3376.947748749305 25.3766666 57 -gcp 22000.5 3226.832684824903 25.3766666 56.5 -gcp 22030.5 33553.9227348527 24.0266666 56.5 Latvijas_un_Igaunijas_topografiskas_kartes_Riga-Jaunjelgava_6828_A1_L36_22_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Riga-Jaunjelgava_6828_A1_L36_22_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "12151.5 3287.993337034981\n2298.0 3375.0\n2370.0 18366.00666296502\n2328.0 33333.0\n12178.5 33447.001665741256\n22030.5 33555.001665741256\n22063.5 18346.505830094393\n22000.5 3226.450860632982" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Riga-Jaunjelgava_6828_A1_L36_22_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Riga-Jaunjelgava_6828_A1_L36_22_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Riga-Jaunjelgava_6828_A1_L36_22_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_Riga-Jaunjelgava_6828_A1_L36_22_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Riga-Jaunjelgava_6828_A1_L36_22_02.xyz