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

.. only:: html

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

        :ref:`Go to the end <sphx_glr_download_user-guide_model-gallery_spatial_plot_piecewise_norm_spatial.py>`
        to download the full example code. or to run this example in your browser via Binder

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

.. _sphx_glr_user-guide_model-gallery_spatial_plot_piecewise_norm_spatial.py:


.. _piecewise-norm-spatial:

Piecewise norm spatial model
============================

This model parametrises a piecewise spatial correction
with a free norm parameter at each fixed node in longitude, latitude
and optionaly energy.

.. GENERATED FROM PYTHON SOURCE LINES 13-16

Example plot
------------
Here is an example plot of the model:

.. GENERATED FROM PYTHON SOURCE LINES 16-38

.. code-block:: Python


    import numpy as np
    from astropy import units as u
    from gammapy.maps import MapCoord, WcsGeom
    from gammapy.modeling.models import (
        FoVBackgroundModel,
        Models,
        PiecewiseNormSpatialModel,
    )

    geom = WcsGeom.create(skydir=(50, 0), npix=(120, 120), binsz=0.03, frame="galactic")
    coords = MapCoord.create(geom.footprint)
    coords["lon"] *= u.deg
    coords["lat"] *= u.deg

    model = PiecewiseNormSpatialModel(
        coords, norms=np.array([0.5, 3, 2, 1]), frame="galactic"
    )

    model.plot(geom=geom)





.. image-sg:: /user-guide/model-gallery/spatial/images/sphx_glr_plot_piecewise_norm_spatial_001.png
   :alt: plot piecewise norm spatial
   :srcset: /user-guide/model-gallery/spatial/images/sphx_glr_plot_piecewise_norm_spatial_001.png
   :class: sphx-glr-single-img


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

 .. code-block:: none


    <WCSAxes: >



.. GENERATED FROM PYTHON SOURCE LINES 39-42

YAML representation
-------------------
Here is an example YAML file using the model:

.. GENERATED FROM PYTHON SOURCE LINES 42-47

.. code-block:: Python


    bkg_model = FoVBackgroundModel(spatial_model=model, dataset_name="dataset")
    models = Models([bkg_model])

    print(models.to_yaml())




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

 .. code-block:: none

    components:
    -   type: FoVBackgroundModel
        datasets_names:
        - dataset
        spectral:
            type: PowerLawNormSpectralModel
            parameters:
            -   name: norm
                value: 1.0
            -   name: tilt
                value: 0.0
            -   name: reference
                value: 1.0
                unit: TeV
        spatial:
            type: PiecewiseNormSpatialModel
            frame: galactic
            parameters:
            -   name: norm_0
                value: 0.5
            -   name: norm_1
                value: 3.0
            -   name: norm_2
                value: 2.0
            -   name: norm_3
                value: 1.0
            lon:
                data:
                - -308.21500000000003
                - -308.21500000000003
                - -311.78499999999997
                - -311.78499999999997
                unit: deg
            lat:
                data:
                - -1.785
                - 1.785
                - 1.785
                - -1.785
                unit: deg
    metadata:
        creator: Gammapy 1.3.dev296+g18b65d5cc
        date: '2024-05-07T18:22:24.821261'
        origin: null






.. _sphx_glr_download_user-guide_model-gallery_spatial_plot_piecewise_norm_spatial.py:

.. only:: html

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

    .. container:: binder-badge

      .. image:: images/binder_badge_logo.svg
        :target: https://mybinder.org/v2/gh/gammapy/gammapy-webpage/main?urlpath=lab/tree/notebooks/dev/user-guide/model-gallery/spatial/plot_piecewise_norm_spatial.ipynb
        :alt: Launch binder
        :width: 150 px

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

      :download:`Download Jupyter notebook: plot_piecewise_norm_spatial.ipynb <plot_piecewise_norm_spatial.ipynb>`

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

      :download:`Download Python source code: plot_piecewise_norm_spatial.py <plot_piecewise_norm_spatial.py>`


.. only:: html

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

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