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   "source": [
    "## list-of-dicts: overview"
   ]
  },
  {
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   "id": "1e5a6456-1177-49c9-a878-3de2780e7118",
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   "source": [
    "The :ref:`data-sources-lod` source reads data from a list of dictionaries. Each dictionary represents a single field and the result is a FieldList consisting of ArrayField fields. "
   ]
  },
  {
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   "source": [
    "First, we create the input data using generic metadata keys. The latitudes and longitudes specified as disctinct values, the 2D field geometry will be automatically built from them."
   ]
  },
  {
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   "source": [
    "import earthkit.data as ekd\n",
    "\n",
    "prototype = {\n",
    "        \"latitudes\": [10.0, 0.0, -10.0],\n",
    "        \"longitudes\": [20, 40.0],\n",
    "        \"values\": [1, 2, 3, 4, 5, 6],\n",
    "        \"valid_datetime\": \"2018-08-01T09:00:00Z\",\n",
    "    }\n",
    "\n",
    "d = [\n",
    "        {\"param\": \"t\", \"level\": 500, **prototype},\n",
    "        {\"param\": \"t\", \"level\": 850, **prototype},\n",
    "        {\"param\": \"u\", \"level\": 500, **prototype},\n",
    "        {\"param\": \"u\", \"level\": 850, **prototype},\n",
    "        {\"param\": \"d\", \"level\": 850, **prototype},\n",
    "        {\"param\": \"d\", \"level\": 600, **prototype},\n",
    "    ]"
   ]
  },
  {
   "cell_type": "raw",
   "id": "fe39a320-88c5-4c7e-96e2-cdde455be402",
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   "source": [
    "Next, load the data into fieldlist as a :ref:`data-sources-lod` source using :ref:`from_source() <data-sources-lod>`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "936a92f9-3fcc-4abf-aae0-c056646f6def",
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   "outputs": [],
   "source": [
    "ds = ekd.from_source(\"list-of-dicts\", d)"
   ]
  },
  {
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       "      <td>None</td>\n",
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       "  param  level base_datetime             valid_datetime  step number\n",
       "0     t    500          None  2018-08-01T09:00:00+00:00  None   None\n",
       "1     t    850          None  2018-08-01T09:00:00+00:00  None   None\n",
       "2     u    500          None  2018-08-01T09:00:00+00:00  None   None\n",
       "3     u    850          None  2018-08-01T09:00:00+00:00  None   None\n",
       "4     d    850          None  2018-08-01T09:00:00+00:00  None   None\n",
       "5     d    600          None  2018-08-01T09:00:00+00:00  None   None"
      ]
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     "execution_count": 3,
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   "source": [
    "ds.ls()"
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   "cell_type": "code",
   "execution_count": 4,
   "id": "374f2be3-7eb4-48f6-909c-f1b6620ea020",
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    {
     "data": {
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       "{'lat': array([[ 10.,  10.],\n",
       "        [  0.,   0.],\n",
       "        [-10., -10.]]),\n",
       " 'lon': array([[20., 40.],\n",
       "        [20., 40.],\n",
       "        [20., 40.]])}"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "ds[0].to_latlon()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "bc82d798-55a5-4fd6-b692-e59c4b5df942",
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    {
     "data": {
      "text/plain": [
       "(array([ 10.,  10.,   0.,   0., -10., -10.]),\n",
       " array([20., 40., 20., 40., 20., 40.]))"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "ds[0].grid_points()"
   ]
  },
  {
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   "execution_count": 6,
   "id": "2c6d57a0-5a10-43d6-9b69-529ac4606d05",
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    {
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       "array([[[1, 2],\n",
       "        [3, 4],\n",
       "        [5, 6]],\n",
       "\n",
       "       [[1, 2],\n",
       "        [3, 4],\n",
       "        [5, 6]],\n",
       "\n",
       "       [[1, 2],\n",
       "        [3, 4],\n",
       "        [5, 6]],\n",
       "\n",
       "       [[1, 2],\n",
       "        [3, 4],\n",
       "        [5, 6]],\n",
       "\n",
       "       [[1, 2],\n",
       "        [3, 4],\n",
       "        [5, 6]],\n",
       "\n",
       "       [[1, 2],\n",
       "        [3, 4],\n",
       "        [5, 6]]])"
      ]
     },
     "execution_count": 6,
     "metadata": {},
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   ],
   "source": [
    "ds.to_numpy()"
   ]
  },
  {
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   "id": "11ce5424-0e3b-40f5-9184-73c8f058cb18",
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    {
     "data": {
      "text/plain": [
       "[500, 850, 500, 850, 850, 600]"
      ]
     },
     "execution_count": 7,
     "metadata": {},
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   ],
   "source": [
    "ds.metadata(\"level\")"
   ]
  },
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   "id": "bbe7dd94-c445-4e9b-aafc-06ee3ef55139",
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    {
     "data": {
      "text/plain": [
       "{'base_time': None,\n",
       " 'valid_time': datetime.datetime(2018, 8, 1, 9, 0, tzinfo=tzutc())}"
      ]
     },
     "execution_count": 8,
     "metadata": {},
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    "ds[0].metadata().datetime()"
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    {
     "data": {
      "text/plain": [
       "datetime.datetime(2018, 8, 1, 9, 0, tzinfo=tzutc())"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "ds[0].metadata().valid_datetime()"
   ]
  },
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   "execution_count": 10,
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       "  param  level base_datetime             valid_datetime  step number\n",
       "0     t    500          None  2018-08-01T09:00:00+00:00  None   None\n",
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       "  param  level base_datetime             valid_datetime  step number\n",
       "0     t    500          None  2018-08-01T09:00:00+00:00  None   None\n",
       "1     u    500          None  2018-08-01T09:00:00+00:00  None   None\n",
       "2     d    600          None  2018-08-01T09:00:00+00:00  None   None\n",
       "3     t    850          None  2018-08-01T09:00:00+00:00  None   None\n",
       "4     u    850          None  2018-08-01T09:00:00+00:00  None   None\n",
       "5     d    850          None  2018-08-01T09:00:00+00:00  None   None"
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     },
     "execution_count": 11,
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   ],
   "source": [
    "ds.order_by(\"level\").ls()"
   ]
  }
 ],
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