.. 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_point.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_point.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_point.py:


.. _point-spatial-model:

Point spatial model
===================

This model is a delta function centered in *lon_0* and *lat_0* parameters provided:

.. math:: \phi(lon, lat) = \delta{(lon - lon_0, lat - lat_0)}

The model is defined on the celestial sphere in the coordinate frame provided by the user.

If the point source is not centered on a pixel, the flux is re-distributed
across 4 neighbouring pixels. This ensured that the center of mass position
is conserved.

.. GENERATED FROM PYTHON SOURCE LINES 19-22

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

.. GENERATED FROM PYTHON SOURCE LINES 22-43

.. code-block:: Python


    from astropy.coordinates import SkyCoord
    from gammapy.maps import WcsGeom
    from gammapy.modeling.models import (
        Models,
        PointSpatialModel,
        PowerLawSpectralModel,
        SkyModel,
    )

    model = PointSpatialModel(
        lon_0="0.01 deg",
        lat_0="0.01 deg",
        frame="galactic",
    )

    geom = WcsGeom.create(
        skydir=SkyCoord("0d 0d", frame="galactic"), width=(1, 1), binsz=0.1
    )
    model.plot(geom=geom, add_cbar=True)




.. image-sg:: /user-guide/model-gallery/spatial/images/sphx_glr_plot_point_001.png
   :alt: plot point
   :srcset: /user-guide/model-gallery/spatial/images/sphx_glr_plot_point_001.png
   :class: sphx-glr-single-img


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

 .. code-block:: none


    <WCSAxes: >



.. GENERATED FROM PYTHON SOURCE LINES 44-47

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

.. GENERATED FROM PYTHON SOURCE LINES 47-55

.. code-block:: Python


    pwl = PowerLawSpectralModel()
    point = PointSpatialModel()

    model = SkyModel(spectral_model=pwl, spatial_model=point, name="pwl-point-model")
    models = Models([model])

    print(models.to_yaml())




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

 .. code-block:: none

    components:
    -   name: pwl-point-model
        type: SkyModel
        spectral:
            type: PowerLawSpectralModel
            parameters:
            -   name: index
                value: 2.0
            -   name: amplitude
                value: 1.0e-12
                unit: cm-2 s-1 TeV-1
            -   name: reference
                value: 1.0
                unit: TeV
        spatial:
            type: PointSpatialModel
            frame: icrs
            parameters:
            -   name: lon_0
                value: 0.0
                unit: deg
            -   name: lat_0
                value: 0.0
                unit: deg
    metadata:
        creator: Gammapy 1.3.dev283+g0ce322691
        date: '2024-05-06T16:05:15.449595'
        origin: null






.. _sphx_glr_download_user-guide_model-gallery_spatial_plot_point.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_point.ipynb
        :alt: Launch binder
        :width: 150 px

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

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

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

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


.. only:: html

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

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