#!/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 0.0 0.0 22.978818691336233 56.960643472868476 -gcp 0.0 16056.0 23.00527393226094 56.966048658524535 -gcp 12351.0 16056.0 23.01288020295317 56.954930123324125 -gcp 12351.0 0.0 22.986431699906127 56.94952656032353 V_Rajons_Jaunsati_DA/LNA_KFFDA_F106_1_4773N.jpg LNA_KFFDA_F106_1_4773N.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "0.0 0.0\n0.0 16056.0\n12351.0 16056.0\n12351.0 0.0" | \
  gdaltransform -tps -output_xy LNA_KFFDA_F106_1_4773N.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  LNA_KFFDA_F106_1_4773N.vrt LNA_KFFDA_F106_1_4773N.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LNA_KFFDA_F106_1_4773N.cut.vrt LNA_KFFDA_F106_1_4773N.xyz