#!/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 2151.0 3273.0 24 57 -gcp 12873.0 3300.0 24.25 57 -gcp 12894.0 16761.0 24.25 56.833333333333336 -gcp 2121.0 16707.0 24 56.833333333333336 lvva/Latvijas_topografiskas_kartes_Riga_6828_A1_L24_4_02.JPG Latvijas_topografiskas_kartes_Riga_6828_A1_L24_4_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2151.0 3273.0\n12873.0 3300.0\n12894.0 16761.0\n2121.0 16707.0" | \
  gdaltransform -tps -output_xy Latvijas_topografiskas_kartes_Riga_6828_A1_L24_4_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_topografiskas_kartes_Riga_6828_A1_L24_4_02.vrt Latvijas_topografiskas_kartes_Riga_6828_A1_L24_4_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_topografiskas_kartes_Riga_6828_A1_L24_4_02.cut.vrt Latvijas_topografiskas_kartes_Riga_6828_A1_L24_4_02.xyz