#!/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 25.05993243 57.04296423 -gcp 21600.0 0.0 25.06472111 57.12866968 -gcp 21600.0 23901.0 25.2372892 57.12613448 -gcp 0.0 23901.0 25.23394688 57.04001391 GX10525/GX_10525_SK_frame_521.jpg GX_10525_SK_frame_521.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "240.0 3912.0\n168.0 21120.0\n20736.0 21288.0\n20514.0 3708.0" | \
  gdaltransform -tps -output_xy GX_10525_SK_frame_521.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10525_SK_frame_521.vrt GX_10525_SK_frame_521.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10525_SK_frame_521.cut.vrt GX_10525_SK_frame_521.xyz