{
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   "metadata": {
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    },
    "tags": []
   },
   "source": [
    "## Build fieldlist from dicts in a loop"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0e02de29-ccd2-4f2c-85c5-b5218179f56f",
   "metadata": {},
   "source": [
    "#### Distinct latitudes/longitudes"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "dd0ba727-0fcc-4c4d-a288-73f01da2921e",
   "metadata": {},
   "source": [
    "In this example each field is defined by a dict using generic metadata keys. The latitudes and longitudes specified as disctinct values, the 2D field geometry will be automatically built from them."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "a17559f9-cba1-4dd4-bc30-14a9be9891ae",
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   "source": [
    "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": "markdown",
   "id": "2e6a5236-09d4-4b61-be4a-e4d860c52d41",
   "metadata": {},
   "source": [
    "Create a fieldlist from the data above in a loop."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "1f902ec4-1eac-4f81-8fff-926a5640363c",
   "metadata": {},
   "outputs": [],
   "source": [
    "from earthkit.data import ArrayField\n",
    "from earthkit.data import SimpleFieldList\n",
    "\n",
    "ds = SimpleFieldList()\n",
    "for f in d:\n",
    "    ds.append(ArrayField(f[\"values\"], f))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "54099091-f8c6-49d0-997e-eb2c69137dfc",
   "metadata": {},
   "outputs": [
    {
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       "  <thead>\n",
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       "      <th></th>\n",
       "      <th>param</th>\n",
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       "      <th>base_datetime</th>\n",
       "      <th>valid_datetime</th>\n",
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       "      <td>None</td>\n",
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       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>t</td>\n",
       "      <td>850</td>\n",
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       "      <td>None</td>\n",
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       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>u</td>\n",
       "      <td>500</td>\n",
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       "      <td>2018-08-01T09:00:00+00:00</td>\n",
       "      <td>None</td>\n",
       "      <td>None</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>u</td>\n",
       "      <td>850</td>\n",
       "      <td>None</td>\n",
       "      <td>2018-08-01T09:00:00+00:00</td>\n",
       "      <td>None</td>\n",
       "      <td>None</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4</th>\n",
       "      <td>d</td>\n",
       "      <td>850</td>\n",
       "      <td>None</td>\n",
       "      <td>2018-08-01T09:00:00+00:00</td>\n",
       "      <td>None</td>\n",
       "      <td>None</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>5</th>\n",
       "      <td>d</td>\n",
       "      <td>600</td>\n",
       "      <td>None</td>\n",
       "      <td>2018-08-01T09:00:00+00:00</td>\n",
       "      <td>None</td>\n",
       "      <td>None</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "  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"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "ds.ls()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "1b841c36-1f50-4851-b69f-53e5e0e1f130",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'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": "db1a5acf-6755-42cb-b0e9-21d7335c0c97",
   "metadata": {},
   "outputs": [
    {
     "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"
    }
   ],
   "source": [
    "ds[0].grid_points()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "e771527b-0b8f-4ac2-b446-ab539614b48b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "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": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "ds.to_numpy()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "3f11ca68-d566-44d9-9ac2-5c33a5a0abab",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[500, 850, 500, 850, 850, 600]"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "ds.metadata(\"level\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "e85b74cc-7524-49ea-9c94-9cdbec2e80dc",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "datetime.datetime(2018, 8, 1, 9, 0, tzinfo=tzutc())"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "ds[0].metadata().valid_datetime()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "f59740a9-e6ce-40bd-a65b-f21a272c51c3",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[20.0, 10.0]"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "ds[0].mars_grid"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "526a4533-a274-4549-bc08-441ae19ecb5a",
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   "outputs": [
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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"
      ]
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    "ds.sel(param=\"t\").ls()"
   ]
  },
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       "      <th>3</th>\n",
       "      <td>t</td>\n",
       "      <td>850</td>\n",
       "      <td>None</td>\n",
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       "      <td>u</td>\n",
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       "    <tr>\n",
       "      <th>5</th>\n",
       "      <td>d</td>\n",
       "      <td>850</td>\n",
       "      <td>None</td>\n",
       "      <td>2018-08-01T09:00:00+00:00</td>\n",
       "      <td>None</td>\n",
       "      <td>None</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
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      "text/plain": [
       "  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"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "ds.order_by(\"level\").ls()"
   ]
  },
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