#!/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 18.0 204.0 22.337216666666666 56.5 -gcp 9012.0 183.0 22.837216666666666 56.5 -gcp 9099.0 8466.0 22.837216666666666 56.25 -gcp -18.0 8511.0 22.337216666666666 56.25 bruno/L16_Reņģe-Vadakste.jpg L16_Reņģe-Vadakste.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "18.0 204.0\n9012.0 183.0\n9099.0 8466.0\n-18.0 8511.0" | \
  gdaltransform -tps -output_xy L16_Reņģe-Vadakste.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  L16_Reņģe-Vadakste.vrt L16_Reņģe-Vadakste.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES L16_Reņģe-Vadakste.cut.vrt L16_Reņģe-Vadakste.xyz