Profile Tool
=============

The profile tool is primarily used to review the channel profile but can also be used to review table data for specific features.

.. image:: ../../img/115-Profile-Tool/profil001.png

Raster Profile
--------------

Create a Raster

1. Set up the raster in the Profile Tool widget.
   In this example, the grid elevation raster is used.
   To create a grid elevation raster, use the Saga-Rasterize tool.
   On the Main QGIS Menu, click Processing>Toolbox.

.. image:: ../../img/115-Profile-Tool/profil002.png
  
2. Enter the search term Rasterize in the Processing Toolbox search feature.
   Double click the Saga Rasterize tool.

.. image:: ../../img/115-Profile-Tool/profil003.png


3. Change the dialog box as shown below and click Run.
   Cell size is the grid element size.
   Fit = cells will ensure that the raster pixels are centered on the grid elements.
   Saga-Rasterize is a good raster generator for FLO-2D data because it builds a raster with hidden null data.
   QGIS has many raster generators, and they all work slightly differently.

.. image:: ../../img/115-Profile-Tool/profil004.png


The raster that is created is a temporary layer called Rasterize.
This layer should be saved to a permanent layer using the QGIS Save As feature.
This feature is found by right clicking the layer.

.. image:: ../../img/115-Profile-Tool/profil005.png


Plot a profile of a polyline on the raster.
-------------------------------------------

The profile tool works for Levee, Channel and Street polylines that are digitized in the user layers only.
This example will test it on a channel polyline.

1. Click the Raster profile radio button and set the raster.
   This example uses Grid Elevation raster.

.. image:: ../../img/115-Profile-Tool/profil006.png
 

2. Click the FLO-2D Info Tool and click on a channel
   segment.

.. image:: ../../img/115-Buttons/floinfo.png

.. image:: ../../img/115-Profile-Tool/profil007.png

3. Select the segment and the elevation profile along the segment line is plotted in the FLO-2D Plot area and the Raster data along the channel line is
   printed to the FLO-2D Table.
   Any data that can be rasterized can be plotted in this manner.
   The table can be copied to an Excel sheet and saved.

.. image:: ../../img/115-Profile-Tool/profil008.png

.. |profil009| image:: ../../img/115-Profile-Tool/profil009.png