#!/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 25.81166983 56.28111029 -gcp 43200.0 0.0 25.76163054 56.27782257 -gcp 43200.0 42714.0 25.75403988 56.30646756 -gcp 0.0 42714.0 25.8075285 56.30990158 GX1006/GX_1006_SD_frame_153.jpg GX_1006_SD_frame_153.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1668.0 5892.0\n1704.0 39048.0\n42672.0 39564.0\n42516.0 5628.0" | \
  gdaltransform -tps -output_xy GX_1006_SD_frame_153.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_1006_SD_frame_153.vrt GX_1006_SD_frame_153.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_1006_SD_frame_153.cut.vrt GX_1006_SD_frame_153.xyz