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   "source": [
    "\n",
    "<h1>Read VIIRS SDR and make a ratio sharpened true color RGB with I- and M-bands</h1>\n",
    "\n",
    "Created with:\n",
    "\n",
    "Package | Version\n",
    "--- | ---\n",
    "SatPy | 0.9.0\n",
    "PyResample | 1.10.1\n",
    "Trollimage | 1.5.3\n",
    "PyKdtree | 1.3.1\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [],
   "source": [
    "from satpy.scene import Scene\n",
    "from satpy import find_files_and_readers\n",
    "from glob import glob\n",
    "from datetime import datetime"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<h2>Find all the SDR files for the scene</h2>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "myfiles = glob(\"/home/a000680/data/polar_in/direct_readout/npp/lvl1/npp_20150421_1143_18033/*h5\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<h2>...or select only a part of the scene</h2>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "/home/a000680/.local/lib/python2.7/site-packages/h5py/__init__.py:36: FutureWarning: Conversion of the second argument of issubdtype from `float` to `np.floating` is deprecated. In future, it will be treated as `np.float64 == np.dtype(float).type`.\n",
      "  from ._conv import register_converters as _register_converters\n"
     ]
    }
   ],
   "source": [
    "DATA_DIR = \"/home/a000680/data/polar_in/direct_readout/npp/lvl1/npp_20150421_1143_18033\"\n",
    "myfiles = find_files_and_readers(base_dir=DATA_DIR,\n",
    "                                 start_time=datetime(2015, 4, 21, 11, 45),\n",
    "                                 end_time=datetime(2015, 4, 21, 11, 52),\n",
    "                                 reader='viirs_sdr')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<h2>Create the scene object</h2>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "scene = Scene(filenames=myfiles, reader='viirs_sdr')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<h2>Load the data for the requested RGB</h2>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "scene.load(['true_color'])"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<h2>Make sure all data are on the same grid and resolution</h2>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "natscn = scene.resample(resampler='native')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "This is necessary since the True Color composite chosen use both I- and M-bands, with different resolutions."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<h2>Display</h2>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<trollimage.xrimage.XRImage at 0x7fec001b6350>"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "natscn.show('true_color')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<img src='https://github.com/pytroll/pytroll-examples/raw/main/satpy/viirs_true_color_iband_enhanced_thumb.png'>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "If you want to save the image to disk?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "/home/a000680/.local/lib/python2.7/site-packages/dask/local.py:271: RuntimeWarning: invalid value encountered in less\n",
      "  return func(*args2)\n",
      "/home/a000680/.local/lib/python2.7/site-packages/dask/local.py:271: RuntimeWarning: invalid value encountered in greater_equal\n",
      "  return func(*args2)\n",
      "/home/a000680/.local/lib/python2.7/site-packages/dask/local.py:271: RuntimeWarning: invalid value encountered in log10\n",
      "  return func(*args2)\n"
     ]
    }
   ],
   "source": [
    "natscn.save_dataset('true_color', filename='./viirs_true_color.png')"
   ]
  }
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