#!/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 2145.0 3240.717065036131 27.1766666 58.25 -gcp 21825.0 3315.19927737632 28.1266666 58.25 -gcp 22051.5 30261.871317398556 28.1266666 57.583333333333336 -gcp 1903.5 30172.82934963869 27.1766666 57.583333333333336 Latvijas_un_Igaunijas_topografiskas_kartes_Pecori_6828_A1_L36_11_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Pecori_6828_A1_L36_11_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2142.0 3237.0\n1900.5 30173.998334258744\n22050.0 30261.0\n21825.0 3315.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Pecori_6828_A1_L36_11_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Pecori_6828_A1_L36_11_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Pecori_6828_A1_L36_11_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_Pecori_6828_A1_L36_11_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Pecori_6828_A1_L36_11_02.xyz