#!/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 25.61262846 55.98317464 -gcp 43200.0 0.0 25.6605649 55.97196107 -gcp 43200.0 42714.0 25.64033031 55.9440812 -gcp 0.0 42714.0 25.59129953 55.95726088 GX1006/GX_1006_SD_frame_156.jpg GX_1006_SD_frame_156.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1680.0 5856.0\n1872.0 38688.0\n42912.0 39312.0\n42576.0 5712.0" | \
  gdaltransform -tps -output_xy GX_1006_SD_frame_156.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_1006_SD_frame_156.vrt GX_1006_SD_frame_156.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_1006_SD_frame_156.cut.vrt GX_1006_SD_frame_156.xyz