#!/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 26.29787821 57.03868519 -gcp 21600.0 0.0 26.30315167 57.12284628 -gcp 21600.0 23091.0 26.46743765 57.12185019 -gcp 0.0 23091.0 26.46656941 57.03533103 GX10525/GX_10525_SK_frame_500.jpg GX_10525_SK_frame_500.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1200.0 3240.0\n1272.0 20112.0\n21096.0 20184.0\n21072.0 2832.0" | \
  gdaltransform -tps -output_xy GX_10525_SK_frame_500.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10525_SK_frame_500.vrt GX_10525_SK_frame_500.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10525_SK_frame_500.cut.vrt GX_10525_SK_frame_500.xyz