.. badge:: Full Course
   :color: blue

Pseudo-Stratigraphy and Remote Sensing
======================================

.. raw:: html

   <!-- Replace VIDEO_ID with the actual YouTube video ID for 10_em_pseudo_strat -->
   <div style="position:relative;padding-bottom:56.25%;height:0;overflow:hidden;max-width:100%;">
   <iframe src="https://www.youtube.com/embed/VIDEO_ID_10_em_pseudo_strat"
           style="position:absolute;top:0;left:0;width:100%;height:100%;"
           frameborder="0" allowfullscreen></iframe>
   </div>
   <p><em>▶ Pseudo-Stratigraphy and Remote Sensing (~~3 min)</em></p>

| **Clip:** 10  |  **Duration:** ~3 min  |  **Recording segment:** ~47:00 → ~50:00

----

Prerequisites
-------------

:doc:`09-grey-zone-combining`

Overview
--------

Geophysical and remote sensing data can be integrated into EM as pseudo-stratigraphic units — hypothetical nodes that represent detected features before physical excavation. When excavated, pseudo-SUs are equalized to real SUs. This supports open, evolving datasets.

.. figure:: /_static/screenshots/clip_10/0001_geophysical_data_blender.jpg
   :alt: Geophysical survey data imported and visualised in the Blender 3D scene.
   :width: 90%

   Geophysical survey data imported and visualised in the Blender 3D scene.

Key Concepts
------------

- Pseudo-SUs represent detected features from non-invasive surveys.
- Geophysical data (GPR, magnetometry) can be visualised directly in Blender.
- Equalization: pseudo-SU → real SU when physically excavated and confirmed.
- EM supports open datasets that evolve over time — data is never final.

Screenshots
-----------

.. figure:: /_static/screenshots/clip_10/0002_wall_detection_phases.jpg
   :alt: Wall features detected at different depths interpreted as three building phases.
   :width: 90%

   Wall features detected at different depths interpreted as three building phases.

.. figure:: /_static/screenshots/clip_10/0003_pseudo_sus_epochs.jpg
   :alt: Pseudo-SUs (100, 101, 102) assigned to provisional epochs.
   :width: 90%

   Pseudo-SUs (100, 101, 102) assigned to provisional epochs.

.. figure:: /_static/screenshots/clip_10/0004_equalization_concept.jpg
   :alt: Equalization: a pseudo-SU becomes a real SU after excavation confirms it.
   :width: 90%

   Equalization: a pseudo-SU becomes a real SU after excavation confirms it.

Try It Yourself
---------------

Add a pseudo-SU to the playground EM and assign it a tentative epoch based on the geophysical evidence.

.. note::

   A video walkthrough for this tutorial will be available on the Extended Matrix YouTube channel.

.. seealso::

   :doc:`EM Data Architecture and Python Library <11-data-architecture>`