Analysis & Visualization
========================

Once that a simulation is loaded, the user has several options at their disposal to further configure, explore or modify the visualization (:numref:`fig-comparative-analysis`):

1.	Open: Load additional simulation visualizations (up to 3) or load a scenario visualization. Loading a scenario removes all loaded simulations.
2.	Configure: Show the Configure Visualization window, to select the parameters to visualize and in which datasets.
3.	Configure the visualized layers/parameters: show and hide layers, configure the colour scale, etc.
4.	Activate the split functionality with the ”Dual map view” button in the vertical button bar. The user can select which layer is shown on which side. 
5.	Open the legend for the loaded layers.
6.	View parameter values for individual road segments or grid tiles by hovering over or clicking on them. If the parameter has been modified, the delta to the original value is shown in red (negative) or green (positive).
7. Use the timeline playback tool to observe parameter's temporal evolution 

For example, the figure below shows a comparison of NO2 between the baseline and the LEZ Emission scenario in Copenhagen. Since there are several layers open, the user might scroll down through the legend to check the values for each layer. There is also the possibility to hover over the layers to see additional information. The user can display another scenario for comparison, and therefore explore the same layer under different simulations and urban contexts (e.g. compare CO2 levels in a baseline scenario vs high-speed road redesign).

.. _fig-comparative-analysis:
.. figure:: images/F20_ComparativeAnalysis.png
   :width: 100%
   :align: center
   :alt: Comparative Analysis

   Comparative Analysis

:numref:`fig-sim-help` shows the tutorial that can be displayed by clicking on the Help button at the bottom right of the screen. The tutorial explains step-by-step the functionality available for simulation visualizations.

.. _fig-sim-help:
.. figure:: images/image0171.jpg
   :width: 100%
   :align: center
   :alt: Simulation visualization Help

   Simulation tutorial



In the left-side panel, expanding the details of a loaded layer gives access to detailed configuration possibilities for the layer, such as the colour scale, the opacity, the visibility, etc. (:numref:`fig-colour-scale`).

.. _fig-colour-scale:
.. figure:: images/image018.jpg
   :width: 100%
   :align: center
   :alt: Colour scale configuration

   Colour Scale Configuration

Additionally, it is possible to use the Filter tool to create dynamic animations as explained in figures previously. In this case, an example is shown of the parameters that can be set to create an animation of Road Occupancy. First, the user can activate the filter to only show the streets that are being occupied, therefore in hours with less traffic some streets will disappear of the map as there are no vehicles passing by. Then, using the time scale filter, the user can set the timeframes to be visualized in the animation. To ensure a smooth and continuous animation, it is recommended to set the playback button to cover a minimum timeframe of 3 hours (:numref:`fig-filter-example`).

The user can expect to obtain results similar to those shown in :numref:`fig-24h-occupancy` and :numref:`fig-24h-no2`. However, the reviewed settings can also be easily adjusted depending on what the user wants to explore or visualize.

.. _fig-filter-example:
.. figure:: images/F21_Filter_example.png
   :width: 100%
   :align: center
   :alt: Example of filter settings for Road Occupancy animation

   Example of filter settings for Road Occupancy animation

.. _fig-24h-occupancy:
.. figure:: images/F22_24h_Occupancy.gif
   :width: 100%
   :align: center
   :alt: 24h Road Occupancy Simulation

   24h Road Occupancy Simulation

.. _fig-24h-no2:
.. figure:: images/F23_24h_NO2.gif
   :width: 100%
   :align: center
   :alt: 24h No2 Concentration Simulation

   24h NO2 Concentration Simulation