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

.. only:: html

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

        Click :ref:`here <sphx_glr_download_gallery_earth-gravity.py>`
        to download the full example code

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

.. _sphx_glr_gallery_earth-gravity.py:


Earth gravity grid at 10 arc-minute resolution
----------------------------------------------

The grid is grid-node registered and stored in netCDF with CF-compliant
metadata. The gravity values are derived from the EIGEN-6C4 spherical harmonic
model. Here "gravity" refers to the combined gravitational and centrifugal
accelerations.

The data are calculated uniformly at 10 km above the WGS84 ellipsoid.

**Original source:** `EIGEN-6C4 model
<https://doi.org/10.5880/icgem.2015.1>`__

.. GENERATED FROM PYTHON SOURCE LINES 22-27

.. code-block:: default

    import pygmt
    import xarray as xr

    import ensaio








.. GENERATED FROM PYTHON SOURCE LINES 28-29

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

.. GENERATED FROM PYTHON SOURCE LINES 29-32

.. code-block:: default

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





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

 Out:

 .. code-block:: none

    /home/runner/work/_temp/cache/ensaio/v1/earth-gravity-10arcmin.nc




.. GENERATED FROM PYTHON SOURCE LINES 33-34

Load the netCDF grid with xarray.

.. GENERATED FROM PYTHON SOURCE LINES 34-37

.. code-block:: default

    data = xr.load_dataarray(fname)
    data






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    </style><pre class='xr-text-repr-fallback'>&lt;xarray.DataArray &#x27;gravity&#x27; (latitude: 1081, longitude: 2161)&gt;
    array([[980106.5 , 980106.5 , 980106.5 , ..., 980106.5 , 980106.5 ,
            980106.5 ],
           [980108.25, 980108.25, 980108.25, ..., 980108.25, 980108.25,
            980108.25],
           [980108.8 , 980108.8 , 980108.8 , ..., 980108.75, 980108.75,
            980108.8 ],
           ...,
           [980153.8 , 980153.75, 980153.6 , ..., 980153.94, 980153.8 ,
            980153.8 ],
           [980160.44, 980160.44, 980160.44, ..., 980160.44, 980160.44,
            980160.44],
           [980157.5 , 980157.5 , 980157.5 , ..., 980157.5 , 980157.5 ,
            980157.5 ]], dtype=float32)
    Coordinates:
      * longitude  (longitude) float64 -180.0 -179.8 -179.7 ... 179.7 179.8 180.0
      * latitude   (latitude) float64 -90.0 -89.83 -89.67 -89.5 ... 89.67 89.83 90.0
        height     (latitude, longitude) float32 1e+04 1e+04 1e+04 ... 1e+04 1e+04
    Attributes:
        Conventions:     CF-1.8
        title:           Gravity acceleration (EIGEN-6C4) at a constant geometric...
        crs:             WGS84
        source:          Generated from the EIGEN-6C4 model by the ICGEM Calculat...
        license:         Creative Commons Attribution 4.0 International Licence
        references:      https://doi.org/10.5880/icgem.2015.1
        long_name:       gravity acceleration
        description:     magnitude of the gravity acceleration vector (gravitatio...
        units:           mGal
        actual_range:    [974748.6 980201.9]
        icgem_metadata:  generating_institute: gfz-potsdam\ngenerating_date: 2021...</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'>'gravity'</div><ul class='xr-dim-list'><li><span class='xr-has-index'>latitude</span>: 1081</li><li><span class='xr-has-index'>longitude</span>: 2161</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-356e484a-ef6f-425c-a36e-0f263df53599' class='xr-array-in' type='checkbox' checked><label for='section-356e484a-ef6f-425c-a36e-0f263df53599' 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>9.801e+05 9.801e+05 9.801e+05 ... 9.802e+05 9.802e+05 9.802e+05</span></div><div class='xr-array-data'><pre>array([[980106.5 , 980106.5 , 980106.5 , ..., 980106.5 , 980106.5 ,
            980106.5 ],
           [980108.25, 980108.25, 980108.25, ..., 980108.25, 980108.25,
            980108.25],
           [980108.8 , 980108.8 , 980108.8 , ..., 980108.75, 980108.75,
            980108.8 ],
           ...,
           [980153.8 , 980153.75, 980153.6 , ..., 980153.94, 980153.8 ,
            980153.8 ],
           [980160.44, 980160.44, 980160.44, ..., 980160.44, 980160.44,
            980160.44],
           [980157.5 , 980157.5 , 980157.5 , ..., 980157.5 , 980157.5 ,
            980157.5 ]], dtype=float32)</pre></div></div></li><li class='xr-section-item'><input id='section-7eee24bb-3a29-407a-861d-05693fbc3ab8' class='xr-section-summary-in' type='checkbox'  checked><label for='section-7eee24bb-3a29-407a-861d-05693fbc3ab8' class='xr-section-summary' >Coordinates: <span>(3)</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'>longitude</span></div><div class='xr-var-dims'>(longitude)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>-180.0 -179.8 ... 179.8 180.0</div><input id='attrs-cae7bfc7-c645-4b5e-9e88-9566f203ceed' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-cae7bfc7-c645-4b5e-9e88-9566f203ceed' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-909aa4c7-5066-4005-8d83-9976249750b6' class='xr-var-data-in' type='checkbox'><label for='data-909aa4c7-5066-4005-8d83-9976249750b6' 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>[-180.  180.]</dd></dl></div><div class='xr-var-data'><pre>array([-180.      , -179.833333, -179.666667, ...,  179.666667,  179.833333,
            180.      ])</pre></div></li><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'>-90.0 -89.83 -89.67 ... 89.83 90.0</div><input id='attrs-de972cf7-9205-4dd9-a1a1-423fb4122df1' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-de972cf7-9205-4dd9-a1a1-423fb4122df1' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-b107101d-b6c5-4f90-b33c-bcf8cd55ba0e' class='xr-var-data-in' type='checkbox'><label for='data-b107101d-b6c5-4f90-b33c-bcf8cd55ba0e' 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>[-90.  90.]</dd></dl></div><div class='xr-var-data'><pre>array([-90.      , -89.833333, -89.666667, ...,  89.666667,  89.833333,
            90.      ])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>height</span></div><div class='xr-var-dims'>(latitude, longitude)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>1e+04 1e+04 1e+04 ... 1e+04 1e+04</div><input id='attrs-9d2f04e8-c5ea-461e-8807-cbffbd7a5134' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-9d2f04e8-c5ea-461e-8807-cbffbd7a5134' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-5709dfd1-23dd-4159-b378-b50221ac120f' class='xr-var-data-in' type='checkbox'><label for='data-5709dfd1-23dd-4159-b378-b50221ac120f' 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>geometric height</dd><dt><span>standard_name :</span></dt><dd>height_above_reference_ellipsoid</dd><dt><span>description :</span></dt><dd>height of gravity computation points above the WGS84 ellipsoid</dd><dt><span>units :</span></dt><dd>m</dd><dt><span>actual_range :</span></dt><dd>[10000. 10000.]</dd></dl></div><div class='xr-var-data'><pre>array([[10000., 10000., 10000., ..., 10000., 10000., 10000.],
           [10000., 10000., 10000., ..., 10000., 10000., 10000.],
           [10000., 10000., 10000., ..., 10000., 10000., 10000.],
           ...,
           [10000., 10000., 10000., ..., 10000., 10000., 10000.],
           [10000., 10000., 10000., ..., 10000., 10000., 10000.],
           [10000., 10000., 10000., ..., 10000., 10000., 10000.]],
          dtype=float32)</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-1c7208b8-6ae3-4071-8615-0796c376a347' class='xr-section-summary-in' type='checkbox'  ><label for='section-1c7208b8-6ae3-4071-8615-0796c376a347' class='xr-section-summary' >Attributes: <span>(11)</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>Gravity acceleration (EIGEN-6C4) at a constant geometric height</dd><dt><span>crs :</span></dt><dd>WGS84</dd><dt><span>source :</span></dt><dd>Generated from the EIGEN-6C4 model by the ICGEM Calculation Service (http://icgem.gfz-potsdam.de)</dd><dt><span>license :</span></dt><dd>Creative Commons Attribution 4.0 International Licence</dd><dt><span>references :</span></dt><dd>https://doi.org/10.5880/icgem.2015.1</dd><dt><span>long_name :</span></dt><dd>gravity acceleration</dd><dt><span>description :</span></dt><dd>magnitude of the gravity acceleration vector (gravitational + centrifugal)</dd><dt><span>units :</span></dt><dd>mGal</dd><dt><span>actual_range :</span></dt><dd>[974748.6 980201.9]</dd><dt><span>icgem_metadata :</span></dt><dd>generating_institute: gfz-potsdam
    generating_date: 2021/06/11
    product_type: gravity_field
    body: earth
    modelname: EIGEN-6C4
    max_used_degree: 720
    gentlecut: 540 to 720
    tide_system: tide_free
    functional: gravity_ell (centrifugal term included)
    unit: mgal
    refsysname: WGS84
    gmrefpot: 3.98600441800E+14 m**3/s**2
    radiusrefpot: 6378137.000 m
    flatrefpot: 3.352810664747480E-03 (1/298.25722356300)
    omegarefpot: 7.29211500000E-05 1/s
    long_lat_unit: degree
    latlimit_north: 90.000000000000
    latlimit_south: -90.000000000000
    longlimit_west: -180.00000000000
    longlimit_east: 180.00000000000
    gridstep: 0.16666666666667
    height_over_ell: 10000.0000 m
    latitude_parallels: 1081
    longitude_parallels: 2161
    number_of_gridpoints: 2336041
    gapvalue: 9999999.0000
    weighted_mean: 9.7667904E+05 mgal
    maxvalue: 9.8020189E+05 mgal
    minvalue: 9.7474860E+05 mgal
    signal_wrms: 1.5468191E+03 mgal
    grid_format: long_lat_value
    attributes: longitude latitude gravity_ell
    attributes_units: deg. deg. mgal</dd></dl></div></li></ul></div></div>
    </div>
    <br />
    <br />

.. GENERATED FROM PYTHON SOURCE LINES 38-39

Make a PyGMT pseudo-color map of the grid in a Mollweide projection.

.. GENERATED FROM PYTHON SOURCE LINES 39-49

.. code-block:: default

    fig = pygmt.Figure()
    fig.basemap(
        region="g",
        projection="W15c",
        frame=True,
    )
    fig.grdimage(data, cmap="viridis", shading="+nt0.5")
    fig.colorbar(frame='af+l"gravity [mGal]"')
    fig.coast(shorelines=True, resolution="c", area_thresh=1e4)
    fig.show()



.. image-sg:: /gallery/images/sphx_glr_earth-gravity_001.png
   :alt: earth gravity
   :srcset: /gallery/images/sphx_glr_earth-gravity_001.png
   :class: sphx-glr-single-img


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

 Out:

 .. code-block:: none

    <IPython.core.display.Image object>





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

   **Total running time of the script:** ( 0 minutes  10.521 seconds)


.. _sphx_glr_download_gallery_earth-gravity.py:


.. only :: html

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



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

     :download:`Download Python source code: earth-gravity.py <earth-gravity.py>`



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

     :download:`Download Jupyter notebook: earth-gravity.ipynb <earth-gravity.ipynb>`


.. only:: html

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

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