#!/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 2542.5 2656.6992773763204 24.0266666 59.75 -gcp 29391.0 3239.322540300167 25.3766666 59.75 -gcp 29095.5 33567.5844913841 25.3766666 59 -gcp 1747.5 32961.27682045581 24.0266666 59 Latvijas_un_Igaunijas_topografiskas_kartes_Tallina_6828_A1_L36_2_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Tallina_6828_A1_L36_2_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "15957.0 2982.0199888950583\n2544.0 2655.0\n2122.5 17809.500832870628\n1744.5 32960.17795669073\n15414.0 33342.042476402\n29097.0 33570.0\n29271.0 18414.00666296502\n29392.5 3234.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Tallina_6828_A1_L36_2_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Tallina_6828_A1_L36_2_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Tallina_6828_A1_L36_2_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_Tallina_6828_A1_L36_2_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Tallina_6828_A1_L36_2_02.xyz