#!/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 25.24313821 56.8998306 -gcp 21600.0 0.0 25.19446397 56.82156718 -gcp 21600.0 22098.0 25.01927227 56.84050673 -gcp 0.0 22098.0 25.07825875 56.94406959 GX2261/GX_2261_SK_frame_19.jpg GX_2261_SK_frame_19.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2640.0 2784.0\n3072.0 19248.0\n17088.0 19008.0\n17136.0 2688.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_19.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_19.vrt GX_2261_SK_frame_19.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_19.cut.vrt GX_2261_SK_frame_19.xyz