python-data/solutions/ex01b_xr_label_based_indexing.ipynb

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    "# Exercise 1b: Label-based indexing"
   ]
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   "source": [
    "## Aim: Learn how to index data arrays"
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   "source": [
    "Find the teaching resources here: https://tutorial.xarray.dev/fundamentals/02.1_indexing_Basic.html."
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   "source": [
    "### Issues Covered: \n",
    "- Indexing, using `.loc()`, `.isel()` and `.sel()`"
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   "source": [
    "Q1. Open the `'../data/xbhubo.pgc0apr.nc'` dataset and load it into an xarray `Dataset` called `ds`.\n",
    "(Hint: Don't forget to import any packages you need).\n",
    "This file is a model run for HadCM3 run as part of the RAPID study: https://catalogue.ceda.ac.uk/uuid/6bbab8394124b252f8b1b036f9eb6b6b/"
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   "source": [
    "import xarray as xr\n",
    "ds = xr.open_dataset('../data/xbhubo.pgc0apr.nc')\n",
    "temperature = ds[\"temp\"]"
   ]
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   "source": [
    "Q2. Select a subset of the `temperature` array using label-based indexing to get data at the position [0,0,0]."
   ]
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       "</style><pre class='xr-text-repr-fallback'>&lt;xarray.DataArray &#x27;temp&#x27; ()&gt; Size: 4B\n",
       "[1 values with dtype=float32]\n",
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       "    title:      POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    date:       01/12/99\n",
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       "    units:      degC\n",
       "    valid_min:  -1.7999878\n",
       "    valid_max:  35.0495</pre><div class='xr-wrap' style='display:none'><div class='xr-header'><div class='xr-obj-type'>xarray.DataArray</div><div class='xr-array-name'>'temp'</div></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-423cae90-1e65-4f60-9ef4-2708a05b2f39' class='xr-array-in' type='checkbox' checked><label for='section-423cae90-1e65-4f60-9ef4-2708a05b2f39' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>...</span></div><div class='xr-array-data'><pre>[1 values with dtype=float32]</pre></div></div></li><li class='xr-section-item'><input id='section-54c49a0a-818e-4001-8a73-446e5d21ee53' class='xr-section-summary-in' type='checkbox'  checked><label for='section-54c49a0a-818e-4001-8a73-446e5d21ee53' class='xr-section-summary' >Coordinates: <span>(4)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>longitude</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>0.0</div><input id='attrs-645239e5-08d2-49af-87aa-c9d634a36388' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-645239e5-08d2-49af-87aa-c9d634a36388' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-19224084-c9b8-49a0-837c-54171770932d' class='xr-var-data-in' type='checkbox'><label for='data-19224084-c9b8-49a0-837c-54171770932d' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>point_spacing :</span></dt><dd>even</dd><dt><span>modulo :</span></dt><dd> </dd></dl></div><div class='xr-var-data'><pre>array(0., dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>latitude</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>-89.38</div><input id='attrs-dddd37a8-b8e1-417e-a7b5-2cf11d0cfcda' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-dddd37a8-b8e1-417e-a7b5-2cf11d0cfcda' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-38907626-cf3f-410a-b15f-5b872d8e457e' class='xr-var-data-in' type='checkbox'><label for='data-38907626-cf3f-410a-b15f-5b872d8e457e' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>point_spacing :</span></dt><dd>even</dd></dl></div><div class='xr-var-data'><pre>array(-89.375, dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>depth</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>5.0</div><input id='attrs-bd7e907a-080f-4ec8-91c2-2c8a6cea4a2d' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-bd7e907a-080f-4ec8-91c2-2c8a6cea4a2d' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-c3c4a404-3bd6-4a6f-944e-c0f65746d702' class='xr-var-data-in' type='checkbox'><label for='data-c3c4a404-3bd6-4a6f-944e-c0f65746d702' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>m</dd><dt><span>positive :</span></dt><dd>down</dd></dl></div><div class='xr-var-data'><pre>array(5., dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>t</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>object</div><div class='xr-var-preview xr-preview'>1920-04-16 00:00:00</div><input id='attrs-ba2be3eb-8348-48d0-bdcd-0b00e968afc9' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-ba2be3eb-8348-48d0-bdcd-0b00e968afc9' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-fc19bf78-1459-4c6d-a432-0679fc0026a9' class='xr-var-data-in' type='checkbox'><label for='data-fc19bf78-1459-4c6d-a432-0679fc0026a9' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>time_origin :</span></dt><dd>01-DEC-1899:00:00:00</dd></dl></div><div class='xr-var-data'><pre>array(cftime.Datetime360Day(1920, 4, 16, 0, 0, 0, 0, has_year_zero=True),\n",
       "      dtype=object)</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-20eb5cfd-c616-4a0c-aede-380910a69492' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-20eb5cfd-c616-4a0c-aede-380910a69492' class='xr-section-summary'  title='Expand/collapse section'>Indexes: <span>(0)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'></ul></div></li><li class='xr-section-item'><input id='section-20b16bbe-b219-4b04-8866-38daa9db6809' class='xr-section-summary-in' type='checkbox'  checked><label for='section-20b16bbe-b219-4b04-8866-38daa9db6809' class='xr-section-summary' >Attributes: <span>(9)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>source :</span></dt><dd>Unified Model Output:</dd><dt><span>name :</span></dt><dd>temp</dd><dt><span>title :</span></dt><dd>POTENTIAL TEMPERATURE (OCEAN)  DEG.C</dd><dt><span>date :</span></dt><dd>01/12/99</dd><dt><span>time :</span></dt><dd>00:00</dd><dt><span>long_name :</span></dt><dd>POTENTIAL TEMPERATURE (OCEAN)  DEG.C</dd><dt><span>units :</span></dt><dd>degC</dd><dt><span>valid_min :</span></dt><dd>-1.7999878</dd><dt><span>valid_max :</span></dt><dd>35.0495</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.DataArray 'temp' ()> Size: 4B\n",
       "[1 values with dtype=float32]\n",
       "Coordinates:\n",
       "    longitude  float32 4B 0.0\n",
       "    latitude   float32 4B -89.38\n",
       "    depth      float32 4B 5.0\n",
       "    t          object 8B 1920-04-16 00:00:00\n",
       "Attributes:\n",
       "    source:     Unified Model Output:\n",
       "    name:       temp\n",
       "    title:      POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    date:       01/12/99\n",
       "    time:       00:00\n",
       "    long_name:  POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    units:      degC\n",
       "    valid_min:  -1.7999878\n",
       "    valid_max:  35.0495"
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     },
     "execution_count": 2,
     "metadata": {},
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   "source": [
    "temperature[0,0,0,0]"
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   "source": [
    "Q3. Use `.loc` to find the temperature 5 meters below the sea surface in south atlantic where latitiude is -50.625 and longitude is 0."
   ]
  },
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   "execution_count": 3,
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     "shell.execute_reply": "2024-11-08T14:55:33.522720Z"
    },
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     "clear_answer_cell"
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       "</style><pre class='xr-text-repr-fallback'>&lt;xarray.DataArray &#x27;temp&#x27; (t: 1)&gt; Size: 4B\n",
       "[1 values with dtype=float32]\n",
       "Coordinates:\n",
       "    longitude  float32 4B 0.0\n",
       "    latitude   float32 4B -50.62\n",
       "    depth      float32 4B 5.0\n",
       "  * t          (t) object 8B 1920-04-16 00:00:00\n",
       "Attributes:\n",
       "    source:     Unified Model Output:\n",
       "    name:       temp\n",
       "    title:      POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    date:       01/12/99\n",
       "    time:       00:00\n",
       "    long_name:  POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    units:      degC\n",
       "    valid_min:  -1.7999878\n",
       "    valid_max:  35.0495</pre><div class='xr-wrap' style='display:none'><div class='xr-header'><div class='xr-obj-type'>xarray.DataArray</div><div class='xr-array-name'>'temp'</div><ul class='xr-dim-list'><li><span class='xr-has-index'>t</span>: 1</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-122d4c91-001f-4b1b-8047-a5270dd8014b' class='xr-array-in' type='checkbox' checked><label for='section-122d4c91-001f-4b1b-8047-a5270dd8014b' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>...</span></div><div class='xr-array-data'><pre>[1 values with dtype=float32]</pre></div></div></li><li class='xr-section-item'><input id='section-7e5f9a3f-7bae-40b0-936d-26760124d604' class='xr-section-summary-in' type='checkbox'  checked><label for='section-7e5f9a3f-7bae-40b0-936d-26760124d604' class='xr-section-summary' >Coordinates: <span>(4)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>longitude</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>0.0</div><input id='attrs-8615bd37-85ee-4a1b-8e6e-e87392f096e7' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-8615bd37-85ee-4a1b-8e6e-e87392f096e7' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-3c4d179b-0bb7-4931-89a8-b8aa23e54de0' class='xr-var-data-in' type='checkbox'><label for='data-3c4d179b-0bb7-4931-89a8-b8aa23e54de0' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>point_spacing :</span></dt><dd>even</dd><dt><span>modulo :</span></dt><dd> </dd></dl></div><div class='xr-var-data'><pre>array(0., dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>latitude</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>-50.62</div><input id='attrs-739095a7-15bf-4d4b-96ad-e71bc9c1ec89' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-739095a7-15bf-4d4b-96ad-e71bc9c1ec89' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-c41c2a96-e9db-4fec-b080-68d053bca40d' class='xr-var-data-in' type='checkbox'><label for='data-c41c2a96-e9db-4fec-b080-68d053bca40d' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>point_spacing :</span></dt><dd>even</dd></dl></div><div class='xr-var-data'><pre>array(-50.625, dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>depth</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>5.0</div><input id='attrs-8a817921-7b09-4490-bd25-93dc5797ebf7' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-8a817921-7b09-4490-bd25-93dc5797ebf7' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-6366c521-f4aa-4c34-9bbb-6234885909b4' class='xr-var-data-in' type='checkbox'><label for='data-6366c521-f4aa-4c34-9bbb-6234885909b4' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>m</dd><dt><span>positive :</span></dt><dd>down</dd></dl></div><div class='xr-var-data'><pre>array(5., dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>t</span></div><div class='xr-var-dims'>(t)</div><div class='xr-var-dtype'>object</div><div class='xr-var-preview xr-preview'>1920-04-16 00:00:00</div><input id='attrs-3a5dfd91-61c0-4501-a7cb-255090deb969' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-3a5dfd91-61c0-4501-a7cb-255090deb969' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-3c138675-be5a-40c8-9c60-83001597fbbd' class='xr-var-data-in' type='checkbox'><label for='data-3c138675-be5a-40c8-9c60-83001597fbbd' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>time_origin :</span></dt><dd>01-DEC-1899:00:00:00</dd></dl></div><div class='xr-var-data'><pre>array([cftime.Datetime360Day(1920, 4, 16, 0, 0, 0, 0, has_year_zero=True)],\n",
       "      dtype=object)</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-bb626603-1b04-473c-81c1-27e22b4db4b6' class='xr-section-summary-in' type='checkbox'  ><label for='section-bb626603-1b04-473c-81c1-27e22b4db4b6' class='xr-section-summary' >Indexes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-index-name'><div>t</div></div><div class='xr-index-preview'>PandasIndex</div><div></div><input id='index-e78562aa-cdbe-4fbf-8a74-e32a2475823d' class='xr-index-data-in' type='checkbox'/><label for='index-e78562aa-cdbe-4fbf-8a74-e32a2475823d' title='Show/Hide index repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-index-data'><pre>PandasIndex(CFTimeIndex([1920-04-16 00:00:00],\n",
       "            dtype=&#x27;object&#x27;, length=1, calendar=&#x27;360_day&#x27;, freq=None))</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-2b549485-3dbb-4507-afd0-6e1d4bb785f6' class='xr-section-summary-in' type='checkbox'  checked><label for='section-2b549485-3dbb-4507-afd0-6e1d4bb785f6' class='xr-section-summary' >Attributes: <span>(9)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>source :</span></dt><dd>Unified Model Output:</dd><dt><span>name :</span></dt><dd>temp</dd><dt><span>title :</span></dt><dd>POTENTIAL TEMPERATURE (OCEAN)  DEG.C</dd><dt><span>date :</span></dt><dd>01/12/99</dd><dt><span>time :</span></dt><dd>00:00</dd><dt><span>long_name :</span></dt><dd>POTENTIAL TEMPERATURE (OCEAN)  DEG.C</dd><dt><span>units :</span></dt><dd>degC</dd><dt><span>valid_min :</span></dt><dd>-1.7999878</dd><dt><span>valid_max :</span></dt><dd>35.0495</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.DataArray 'temp' (t: 1)> Size: 4B\n",
       "[1 values with dtype=float32]\n",
       "Coordinates:\n",
       "    longitude  float32 4B 0.0\n",
       "    latitude   float32 4B -50.62\n",
       "    depth      float32 4B 5.0\n",
       "  * t          (t) object 8B 1920-04-16 00:00:00\n",
       "Attributes:\n",
       "    source:     Unified Model Output:\n",
       "    name:       temp\n",
       "    title:      POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    date:       01/12/99\n",
       "    time:       00:00\n",
       "    long_name:  POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    units:      degC\n",
       "    valid_min:  -1.7999878\n",
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     },
     "execution_count": 3,
     "metadata": {},
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   "source": [
    "temperature.loc[:, 5, -50.625, 0]"
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    "Q4. It's not ideal to have to keep track of which dimension is in which position. Instead, use `.isel` to use the dimension names to get the data in the same place: this is depth position 0, latitude position 31 and longitude position 0."
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       "</style><pre class='xr-text-repr-fallback'>&lt;xarray.DataArray &#x27;temp&#x27; (t: 1)&gt; Size: 4B\n",
       "[1 values with dtype=float32]\n",
       "Coordinates:\n",
       "    longitude  float32 4B 0.0\n",
       "    latitude   float32 4B -50.62\n",
       "    depth      float32 4B 5.0\n",
       "  * t          (t) object 8B 1920-04-16 00:00:00\n",
       "Attributes:\n",
       "    source:     Unified Model Output:\n",
       "    name:       temp\n",
       "    title:      POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    date:       01/12/99\n",
       "    time:       00:00\n",
       "    long_name:  POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    units:      degC\n",
       "    valid_min:  -1.7999878\n",
       "    valid_max:  35.0495</pre><div class='xr-wrap' style='display:none'><div class='xr-header'><div class='xr-obj-type'>xarray.DataArray</div><div class='xr-array-name'>'temp'</div><ul class='xr-dim-list'><li><span class='xr-has-index'>t</span>: 1</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-e9ccc820-0c95-4785-a7a7-a25363f86705' class='xr-array-in' type='checkbox' checked><label for='section-e9ccc820-0c95-4785-a7a7-a25363f86705' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>...</span></div><div class='xr-array-data'><pre>[1 values with dtype=float32]</pre></div></div></li><li class='xr-section-item'><input id='section-2dfc505b-daab-4451-8819-1af73b69ffe1' class='xr-section-summary-in' type='checkbox'  checked><label for='section-2dfc505b-daab-4451-8819-1af73b69ffe1' class='xr-section-summary' >Coordinates: <span>(4)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>longitude</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>0.0</div><input id='attrs-24aa015c-aeb6-4fd9-9e02-51cc79809936' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-24aa015c-aeb6-4fd9-9e02-51cc79809936' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-9c685253-2b8d-497a-b362-68734b382f4a' class='xr-var-data-in' type='checkbox'><label for='data-9c685253-2b8d-497a-b362-68734b382f4a' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>point_spacing :</span></dt><dd>even</dd><dt><span>modulo :</span></dt><dd> </dd></dl></div><div class='xr-var-data'><pre>array(0., dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>latitude</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>-50.62</div><input id='attrs-7c995b57-e4d9-4d3e-9952-c71f95d9b0c8' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-7c995b57-e4d9-4d3e-9952-c71f95d9b0c8' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-3709ff24-103d-4052-b903-a271cb04797f' class='xr-var-data-in' type='checkbox'><label for='data-3709ff24-103d-4052-b903-a271cb04797f' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>point_spacing :</span></dt><dd>even</dd></dl></div><div class='xr-var-data'><pre>array(-50.625, dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>depth</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>5.0</div><input id='attrs-aa94e9e4-b5e7-47f1-a94d-51716594d40c' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-aa94e9e4-b5e7-47f1-a94d-51716594d40c' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-a402054b-acde-430f-9007-8b8f07630ea0' class='xr-var-data-in' type='checkbox'><label for='data-a402054b-acde-430f-9007-8b8f07630ea0' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>m</dd><dt><span>positive :</span></dt><dd>down</dd></dl></div><div class='xr-var-data'><pre>array(5., dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>t</span></div><div class='xr-var-dims'>(t)</div><div class='xr-var-dtype'>object</div><div class='xr-var-preview xr-preview'>1920-04-16 00:00:00</div><input id='attrs-08ab80fc-ac6f-451d-8ad3-b3bb3a301a0a' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-08ab80fc-ac6f-451d-8ad3-b3bb3a301a0a' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-537a5956-7259-43f0-809f-c12b2fcac139' class='xr-var-data-in' type='checkbox'><label for='data-537a5956-7259-43f0-809f-c12b2fcac139' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>time_origin :</span></dt><dd>01-DEC-1899:00:00:00</dd></dl></div><div class='xr-var-data'><pre>array([cftime.Datetime360Day(1920, 4, 16, 0, 0, 0, 0, has_year_zero=True)],\n",
       "      dtype=object)</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-d933f91b-d0b3-4485-b7cc-36f9dc3dcf0c' class='xr-section-summary-in' type='checkbox'  ><label for='section-d933f91b-d0b3-4485-b7cc-36f9dc3dcf0c' class='xr-section-summary' >Indexes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-index-name'><div>t</div></div><div class='xr-index-preview'>PandasIndex</div><div></div><input id='index-109bf08a-b116-41b8-9b74-307b69a2aba1' class='xr-index-data-in' type='checkbox'/><label for='index-109bf08a-b116-41b8-9b74-307b69a2aba1' title='Show/Hide index repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-index-data'><pre>PandasIndex(CFTimeIndex([1920-04-16 00:00:00],\n",
       "            dtype=&#x27;object&#x27;, length=1, calendar=&#x27;360_day&#x27;, freq=None))</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-8a15e777-709f-460c-af78-a03c8c1b9361' class='xr-section-summary-in' type='checkbox'  checked><label for='section-8a15e777-709f-460c-af78-a03c8c1b9361' class='xr-section-summary' >Attributes: <span>(9)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>source :</span></dt><dd>Unified Model Output:</dd><dt><span>name :</span></dt><dd>temp</dd><dt><span>title :</span></dt><dd>POTENTIAL TEMPERATURE (OCEAN)  DEG.C</dd><dt><span>date :</span></dt><dd>01/12/99</dd><dt><span>time :</span></dt><dd>00:00</dd><dt><span>long_name :</span></dt><dd>POTENTIAL TEMPERATURE (OCEAN)  DEG.C</dd><dt><span>units :</span></dt><dd>degC</dd><dt><span>valid_min :</span></dt><dd>-1.7999878</dd><dt><span>valid_max :</span></dt><dd>35.0495</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.DataArray 'temp' (t: 1)> Size: 4B\n",
       "[1 values with dtype=float32]\n",
       "Coordinates:\n",
       "    longitude  float32 4B 0.0\n",
       "    latitude   float32 4B -50.62\n",
       "    depth      float32 4B 5.0\n",
       "  * t          (t) object 8B 1920-04-16 00:00:00\n",
       "Attributes:\n",
       "    source:     Unified Model Output:\n",
       "    name:       temp\n",
       "    title:      POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    date:       01/12/99\n",
       "    time:       00:00\n",
       "    long_name:  POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    units:      degC\n",
       "    valid_min:  -1.7999878\n",
       "    valid_max:  35.0495"
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     },
     "execution_count": 4,
     "metadata": {},
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   ],
   "source": [
    "temperature.isel(depth=0, latitude=31, longitude=0)"
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    "Q5. The previous method is still referring to a selection by integer position. Use `.sel` to give a labelled index with the named dimension to find the data at `time=2065-12-30`, `lat=-78.5`, `lon=11.0`."
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       "\n",
       ".xr-section-summary-in:disabled + label {\n",
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       "\n",
       ".xr-section-summary-in + label:before {\n",
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       "  font-size: 11px;\n",
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       ".xr-section-summary-in:disabled + label:before {\n",
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       "\n",
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       ".xr-section-details {\n",
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       "\n",
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       "\n",
       ".xr-array-in:checked ~ .xr-array-data,\n",
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       "\n",
       ".xr-dim-list li {\n",
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       ".xr-dim-list:before {\n",
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       ".xr-dim-list:after {\n",
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       "\n",
       ".xr-dim-list li:not(:last-child):after {\n",
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       ".xr-has-index {\n",
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       "\n",
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       ".xr-var-item > .xr-var-name span {\n",
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       "\n",
       ".xr-var-item > .xr-var-name:hover span {\n",
       "  padding-right: 5px;\n",
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       "\n",
       ".xr-var-list > li:nth-child(odd) > div,\n",
       ".xr-var-list > li:nth-child(odd) > label,\n",
       ".xr-var-list > li:nth-child(odd) > .xr-var-name span {\n",
       "  background-color: var(--xr-background-color-row-odd);\n",
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       "\n",
       ".xr-var-name {\n",
       "  grid-column: 1;\n",
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       "\n",
       ".xr-var-dims {\n",
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       "\n",
       ".xr-var-dtype {\n",
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       "  text-align: right;\n",
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       "\n",
       ".xr-var-preview {\n",
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       "}\n",
       "\n",
       ".xr-index-preview {\n",
       "  grid-column: 2 / 5;\n",
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       "\n",
       ".xr-var-name,\n",
       ".xr-var-dims,\n",
       ".xr-var-dtype,\n",
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       "\n",
       ".xr-var-name:hover,\n",
       ".xr-var-dims:hover,\n",
       ".xr-var-dtype:hover,\n",
       ".xr-attrs dt:hover {\n",
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       "\n",
       ".xr-var-attrs,\n",
       ".xr-var-data,\n",
       ".xr-index-data {\n",
       "  display: none;\n",
       "  background-color: var(--xr-background-color) !important;\n",
       "  padding-bottom: 5px !important;\n",
       "}\n",
       "\n",
       ".xr-var-attrs-in:checked ~ .xr-var-attrs,\n",
       ".xr-var-data-in:checked ~ .xr-var-data,\n",
       ".xr-index-data-in:checked ~ .xr-index-data {\n",
       "  display: block;\n",
       "}\n",
       "\n",
       ".xr-var-data > table {\n",
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       "\n",
       ".xr-var-name span,\n",
       ".xr-var-data,\n",
       ".xr-index-name div,\n",
       ".xr-index-data,\n",
       ".xr-attrs {\n",
       "  padding-left: 25px !important;\n",
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       "\n",
       ".xr-attrs,\n",
       ".xr-var-attrs,\n",
       ".xr-var-data,\n",
       ".xr-index-data {\n",
       "  grid-column: 1 / -1;\n",
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       "\n",
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       "\n",
       ".xr-attrs dt,\n",
       ".xr-attrs dd {\n",
       "  padding: 0;\n",
       "  margin: 0;\n",
       "  float: left;\n",
       "  padding-right: 10px;\n",
       "  width: auto;\n",
       "}\n",
       "\n",
       ".xr-attrs dt {\n",
       "  font-weight: normal;\n",
       "  grid-column: 1;\n",
       "}\n",
       "\n",
       ".xr-attrs dt:hover span {\n",
       "  display: inline-block;\n",
       "  background: var(--xr-background-color);\n",
       "  padding-right: 10px;\n",
       "}\n",
       "\n",
       ".xr-attrs dd {\n",
       "  grid-column: 2;\n",
       "  white-space: pre-wrap;\n",
       "  word-break: break-all;\n",
       "}\n",
       "\n",
       ".xr-icon-database,\n",
       ".xr-icon-file-text2,\n",
       ".xr-no-icon {\n",
       "  display: inline-block;\n",
       "  vertical-align: middle;\n",
       "  width: 1em;\n",
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       "  stroke-width: 0;\n",
       "  stroke: currentColor;\n",
       "  fill: currentColor;\n",
       "}\n",
       "</style><pre class='xr-text-repr-fallback'>&lt;xarray.DataArray &#x27;temp&#x27; (t: 1)&gt; Size: 4B\n",
       "[1 values with dtype=float32]\n",
       "Coordinates:\n",
       "    longitude  float32 4B 0.0\n",
       "    latitude   float32 4B -50.62\n",
       "    depth      float32 4B 5.0\n",
       "  * t          (t) object 8B 1920-04-16 00:00:00\n",
       "Attributes:\n",
       "    source:     Unified Model Output:\n",
       "    name:       temp\n",
       "    title:      POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    date:       01/12/99\n",
       "    time:       00:00\n",
       "    long_name:  POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    units:      degC\n",
       "    valid_min:  -1.7999878\n",
       "    valid_max:  35.0495</pre><div class='xr-wrap' style='display:none'><div class='xr-header'><div class='xr-obj-type'>xarray.DataArray</div><div class='xr-array-name'>'temp'</div><ul class='xr-dim-list'><li><span class='xr-has-index'>t</span>: 1</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-5b135839-5814-4cbb-be79-9d47802077ae' class='xr-array-in' type='checkbox' checked><label for='section-5b135839-5814-4cbb-be79-9d47802077ae' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>...</span></div><div class='xr-array-data'><pre>[1 values with dtype=float32]</pre></div></div></li><li class='xr-section-item'><input id='section-70b44fb6-889c-42e8-912d-17fffa03d92a' class='xr-section-summary-in' type='checkbox'  checked><label for='section-70b44fb6-889c-42e8-912d-17fffa03d92a' class='xr-section-summary' >Coordinates: <span>(4)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>longitude</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>0.0</div><input id='attrs-f294f227-7c0e-48ee-8d13-932c97f25a2f' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-f294f227-7c0e-48ee-8d13-932c97f25a2f' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-d7d633d8-8b63-4404-8161-fa9ae19d5639' class='xr-var-data-in' type='checkbox'><label for='data-d7d633d8-8b63-4404-8161-fa9ae19d5639' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>point_spacing :</span></dt><dd>even</dd><dt><span>modulo :</span></dt><dd> </dd></dl></div><div class='xr-var-data'><pre>array(0., dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>latitude</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>-50.62</div><input id='attrs-24bbcc92-9f2e-4c05-b58c-c2793e1444e3' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-24bbcc92-9f2e-4c05-b58c-c2793e1444e3' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-a5ef5386-b010-429a-a657-2d9204d19dac' class='xr-var-data-in' type='checkbox'><label for='data-a5ef5386-b010-429a-a657-2d9204d19dac' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>point_spacing :</span></dt><dd>even</dd></dl></div><div class='xr-var-data'><pre>array(-50.625, dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>depth</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>5.0</div><input id='attrs-76249974-869a-45cd-be23-0f0835ae427f' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-76249974-869a-45cd-be23-0f0835ae427f' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-970281f4-ddba-49a3-a9cd-c8fdefa367d5' class='xr-var-data-in' type='checkbox'><label for='data-970281f4-ddba-49a3-a9cd-c8fdefa367d5' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>m</dd><dt><span>positive :</span></dt><dd>down</dd></dl></div><div class='xr-var-data'><pre>array(5., dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>t</span></div><div class='xr-var-dims'>(t)</div><div class='xr-var-dtype'>object</div><div class='xr-var-preview xr-preview'>1920-04-16 00:00:00</div><input id='attrs-0e021a8d-ec55-4463-b8d3-e7248cbfbb51' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-0e021a8d-ec55-4463-b8d3-e7248cbfbb51' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-b18ee2c2-3f7a-40bc-8955-b41d6f35f9ad' class='xr-var-data-in' type='checkbox'><label for='data-b18ee2c2-3f7a-40bc-8955-b41d6f35f9ad' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>time_origin :</span></dt><dd>01-DEC-1899:00:00:00</dd></dl></div><div class='xr-var-data'><pre>array([cftime.Datetime360Day(1920, 4, 16, 0, 0, 0, 0, has_year_zero=True)],\n",
       "      dtype=object)</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-9355ffd0-fd57-4c81-b8ab-4b33626e9d65' class='xr-section-summary-in' type='checkbox'  ><label for='section-9355ffd0-fd57-4c81-b8ab-4b33626e9d65' class='xr-section-summary' >Indexes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-index-name'><div>t</div></div><div class='xr-index-preview'>PandasIndex</div><div></div><input id='index-5bf10c81-50b3-49e1-a64d-ac2a1bd4765e' class='xr-index-data-in' type='checkbox'/><label for='index-5bf10c81-50b3-49e1-a64d-ac2a1bd4765e' title='Show/Hide index repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-index-data'><pre>PandasIndex(CFTimeIndex([1920-04-16 00:00:00],\n",
       "            dtype=&#x27;object&#x27;, length=1, calendar=&#x27;360_day&#x27;, freq=None))</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-a4b3e5f8-a339-4550-97ed-f50d5268275d' class='xr-section-summary-in' type='checkbox'  checked><label for='section-a4b3e5f8-a339-4550-97ed-f50d5268275d' class='xr-section-summary' >Attributes: <span>(9)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>source :</span></dt><dd>Unified Model Output:</dd><dt><span>name :</span></dt><dd>temp</dd><dt><span>title :</span></dt><dd>POTENTIAL TEMPERATURE (OCEAN)  DEG.C</dd><dt><span>date :</span></dt><dd>01/12/99</dd><dt><span>time :</span></dt><dd>00:00</dd><dt><span>long_name :</span></dt><dd>POTENTIAL TEMPERATURE (OCEAN)  DEG.C</dd><dt><span>units :</span></dt><dd>degC</dd><dt><span>valid_min :</span></dt><dd>-1.7999878</dd><dt><span>valid_max :</span></dt><dd>35.0495</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.DataArray 'temp' (t: 1)> Size: 4B\n",
       "[1 values with dtype=float32]\n",
       "Coordinates:\n",
       "    longitude  float32 4B 0.0\n",
       "    latitude   float32 4B -50.62\n",
       "    depth      float32 4B 5.0\n",
       "  * t          (t) object 8B 1920-04-16 00:00:00\n",
       "Attributes:\n",
       "    source:     Unified Model Output:\n",
       "    name:       temp\n",
       "    title:      POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    date:       01/12/99\n",
       "    time:       00:00\n",
       "    long_name:  POTENTIAL TEMPERATURE (OCEAN)  DEG.C\n",
       "    units:      degC\n",
       "    valid_min:  -1.7999878\n",
       "    valid_max:  35.0495"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "temperature.sel(depth=5, latitude=-50.625, longitude=0)"
   ]
  }
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