#!/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 25.48875332 56.17647335 -gcp 21381.0 0.0 25.47903758 56.20471982 -gcp 21381.0 20811.0 25.53043485 56.21102411 -gcp 0.0 20811.0 25.54111004 56.18138208 GX1006/GX_1006_SD_frame_137.jpg GX_1006_SD_frame_137.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "696.0 2712.0\n672.0 18888.0\n21216.0 18816.0\n21156.0 2484.0" | \
  gdaltransform -tps -output_xy GX_1006_SD_frame_137.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_1006_SD_frame_137.vrt GX_1006_SD_frame_137.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_1006_SD_frame_137.cut.vrt GX_1006_SD_frame_137.xyz