#!/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 25.74443596 56.38684663 -gcp 21477.0 0.0 25.78649573 56.39833589 -gcp 21477.0 21171.0 25.80847371 56.3752362 -gcp 0.0 21171.0 25.76466627 56.36224399 GX1443/GX_1443_SD_frame_13.jpg GX_1443_SD_frame_13.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "21192.0 2868.0\n780.0 2820.0\n960.0 19152.0\n21360.0 19152.0" | \
  gdaltransform -tps -output_xy GX_1443_SD_frame_13.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_1443_SD_frame_13.vrt GX_1443_SD_frame_13.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_1443_SD_frame_13.cut.vrt GX_1443_SD_frame_13.xyz