#!/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 27.02512268 57.25937004 -gcp 21600.0 0.0 27.04521964 57.34242651 -gcp 21600.0 23403.0 27.21009253 57.33202041 -gcp 0.0 23403.0 27.19623048 57.24913717 GX8464/GX_8464_SK_frame_246.jpg GX_8464_SK_frame_246.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "468.06808510638325 2880.0\n432.00340425531886 19932.0\n20976.02723404255 19992.0\n21156.139574468085 2856.0" | \
  gdaltransform -tps -output_xy GX_8464_SK_frame_246.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_8464_SK_frame_246.vrt GX_8464_SK_frame_246.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_8464_SK_frame_246.cut.vrt GX_8464_SK_frame_246.xyz