.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "gallery/southern-africa-topography.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_gallery_southern-africa-topography.py>`
        to download the full example code

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_gallery_southern-africa-topography.py:


Topography and bathymetry of Southern Africa
--------------------------------------------

This dataset consists in a regular grid with topography and bathymetry over
Southern Africa. It was generated by cropping the ETOPO1 global topography
grid to the desired area.
The topography and bathymetry heights are referenced to sea level (what can be
considered as the geoid).

**Original source:** `ETOPO1
<https://doi.org/10.7289/V5C8276M>`__

**Pre-processing:** `Source code for preparation of the original dataset for
redistribution in Ensaio
<https://github.com/fatiando-data/southern-africa-topography>`__

.. GENERATED FROM PYTHON SOURCE LINES 24-30

.. code-block:: Python


    import pygmt
    import xarray as xr

    import ensaio








.. GENERATED FROM PYTHON SOURCE LINES 31-32

Download and cache the data and return the path to it on disk

.. GENERATED FROM PYTHON SOURCE LINES 32-35

.. code-block:: Python

    fname = ensaio.fetch_southern_africa_topography(version=1)
    print(fname)





.. rst-class:: sphx-glr-script-out

 .. code-block:: none

    /home/runner/work/_temp/cache/ensaio/v1/southern-africa-topography.nc




.. GENERATED FROM PYTHON SOURCE LINES 36-37

Load the netCDF file with xarray (netcdf4 is required)

.. GENERATED FROM PYTHON SOURCE LINES 37-40

.. code-block:: Python

    data = xr.load_dataarray(fname)
    data






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    </style><pre class='xr-text-repr-fallback'>&lt;xarray.DataArray &#x27;topography&#x27; (latitude: 1182, longitude: 1371)&gt; Size: 13MB
    array([[-5039., -5027., -5014., ..., -3846., -3867., -3873.],
           [-5036., -5021., -5007., ..., -3839., -3863., -3872.],
           [-5031., -5016., -5001., ..., -3835., -3860., -3870.],
           ...,
           [-2906., -2901., -2884., ...,   173.,   134.,   118.],
           [-2908., -2906., -2888., ...,   132.,   119.,   118.],
           [-2912., -2910., -2894., ...,   122.,   120.,   128.]],
          shape=(1182, 1371))
    Coordinates:
      * latitude   (latitude) float64 9kB -36.0 -35.98 -35.97 ... -16.33 -16.32
      * longitude  (longitude) float64 11kB 10.92 10.93 10.95 ... 33.72 33.73 33.75
    Attributes:
        Conventions:    CF-1.8
        title:          Topographic and bathymetric height for Southern Africa ob...
        crs:            WGS84
        source:         Downloaded from NOAA website (https://ngdc.noaa.gov/mgg/g...
        license:        public domain
        references:     https://doi.org/10.7289/V5C8276M
        long_name:      topographic height above mean sea level
        standard_name:  height_above_mean_sea_level
        description:    height topography/bathymetry referenced to mean sea level
        units:          m
        actual_range:   [-5685.  3376.]
        noaa_metadata:  Conventions: COARDS/CF-1.0\ntitle: ETOPO1_Ice_g_gmt4.grd\...</pre><div class='xr-wrap' style='display:none'><div class='xr-header'><div class='xr-obj-type'>xarray.DataArray</div><div class='xr-obj-name'>&#x27;topography&#x27;</div><ul class='xr-dim-list'><li><span class='xr-has-index'>latitude</span>: 1182</li><li><span class='xr-has-index'>longitude</span>: 1371</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-285492a5-be1b-4c85-87c6-92d101e338ed' class='xr-array-in' type='checkbox' checked><label for='section-285492a5-be1b-4c85-87c6-92d101e338ed' 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>-5.039e+03 -5.027e+03 -5.014e+03 -5.006e+03 ... 122.0 120.0 128.0</span></div><div class='xr-array-data'><pre>array([[-5039., -5027., -5014., ..., -3846., -3867., -3873.],
           [-5036., -5021., -5007., ..., -3839., -3863., -3872.],
           [-5031., -5016., -5001., ..., -3835., -3860., -3870.],
           ...,
           [-2906., -2901., -2884., ...,   173.,   134.,   118.],
           [-2908., -2906., -2888., ...,   132.,   119.,   118.],
           [-2912., -2910., -2894., ...,   122.,   120.,   128.]],
          shape=(1182, 1371))</pre></div></div></li><li class='xr-section-item'><input id='section-ca83e7eb-4fa2-45ec-9e55-1c4628a7902b' class='xr-section-summary-in' type='checkbox' checked /><label for='section-ca83e7eb-4fa2-45ec-9e55-1c4628a7902b' class='xr-section-summary' title='Expand/collapse section'>Coordinates: <span>(2)</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 class='xr-has-index'>latitude</span></div><div class='xr-var-dims'>(latitude)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>-36.0 -35.98 ... -16.33 -16.32</div><input id='attrs-8c16a226-4f81-41e0-aba6-81ca1d720eef' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-8c16a226-4f81-41e0-aba6-81ca1d720eef' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-0a8c8e8d-4bf0-4a51-af5f-1b5df728ec48' class='xr-var-data-in' type='checkbox'><label for='data-0a8c8e8d-4bf0-4a51-af5f-1b5df728ec48' 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>long_name :</span></dt><dd>latitude</dd><dt><span>standard_name :</span></dt><dd>latitude</dd><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>actual_range :</span></dt><dd>[-36.         -16.31666667]</dd></dl></div><div class='xr-var-data'><pre>array([-36.      , -35.983333, -35.966667, ..., -16.35    , -16.333333,
           -16.316667], shape=(1182,))</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>longitude</span></div><div class='xr-var-dims'>(longitude)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>10.92 10.93 10.95 ... 33.73 33.75</div><input id='attrs-340428b5-0673-4485-b2fd-b389bd6bc5bb' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-340428b5-0673-4485-b2fd-b389bd6bc5bb' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-7f3d1d53-233b-4061-a469-477bf514336d' class='xr-var-data-in' type='checkbox'><label for='data-7f3d1d53-233b-4061-a469-477bf514336d' 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>long_name :</span></dt><dd>longitude</dd><dt><span>standard_name :</span></dt><dd>longitude</dd><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>actual_range :</span></dt><dd>[10.91666667 33.75      ]</dd></dl></div><div class='xr-var-data'><pre>array([10.916667, 10.933333, 10.95    , ..., 33.716667, 33.733333, 33.75    ],
          shape=(1371,))</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-1c1e6b8e-5b33-419d-8713-cc3a3459dc21' class='xr-section-summary-in' type='checkbox' /><label for='section-1c1e6b8e-5b33-419d-8713-cc3a3459dc21' class='xr-section-summary' title='Expand/collapse section'>Attributes: <span>(12)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>Conventions :</span></dt><dd>CF-1.8</dd><dt><span>title :</span></dt><dd>Topographic and bathymetric height for Southern Africa obtained from ETOPO1 (ice surface)</dd><dt><span>crs :</span></dt><dd>WGS84</dd><dt><span>source :</span></dt><dd>Downloaded from NOAA website (https://ngdc.noaa.gov/mgg/global/global.html)</dd><dt><span>license :</span></dt><dd>public domain</dd><dt><span>references :</span></dt><dd>https://doi.org/10.7289/V5C8276M</dd><dt><span>long_name :</span></dt><dd>topographic height above mean sea level</dd><dt><span>standard_name :</span></dt><dd>height_above_mean_sea_level</dd><dt><span>description :</span></dt><dd>height topography/bathymetry referenced to mean sea level</dd><dt><span>units :</span></dt><dd>m</dd><dt><span>actual_range :</span></dt><dd>[-5685.  3376.]</dd><dt><span>noaa_metadata :</span></dt><dd>Conventions: COARDS/CF-1.0
    title: ETOPO1_Ice_g_gmt4.grd
    GMT_version: 4.4.0
    node_offset: 0</dd></dl></div></li></ul></div></div>
    </div>
    <br />
    <br />

.. GENERATED FROM PYTHON SOURCE LINES 41-42

Make a PyGMT map of the topography and bathymetry data

.. GENERATED FROM PYTHON SOURCE LINES 42-48

.. code-block:: Python

    fig = pygmt.Figure()
    fig.grdimage(data, cmap="etopo1", projection="M15c")
    fig.colorbar(frame='af+l"topography [m]"', position="JCR")
    fig.basemap(frame=True)
    fig.coast(shorelines="0.1p", area_thresh=1e4)
    fig.show()



.. image-sg:: /gallery/images/sphx_glr_southern-africa-topography_001.png
   :alt: southern africa topography
   :srcset: /gallery/images/sphx_glr_southern-africa-topography_001.png
   :class: sphx-glr-single-img






.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 6.102 seconds)


.. _sphx_glr_download_gallery_southern-africa-topography.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: southern-africa-topography.ipynb <southern-africa-topography.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: southern-africa-topography.py <southern-africa-topography.py>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_