Digitizing Pipe Sections
===============================

General
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TDH has no wizard to correctly build pipe_sections and connect them to pipe_points (normal or feed).


.. attention:: Start digitizing in the direction of the flow by starting with the
  **from pipe_point feed start node** and finishing with the **to pipe_point feed end node**.

Digitizing
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* Make sure that the automatic snapping tool is activated for all layers.

* Select the pipe_section layer in that layer panel and then select the edit mode.

* In digitizing mode the cursor will automatically snap to the nearest district heating node or pipe_section.
  When left clicking a line starts to draw.


* With further left clicks anywhere you can define intermediary points of the reach progression.
  You can also directly select another pipe_point_normal to draw a straight channel.

* You finish digitizing the line by right clicking. This will make the **pipe_section** feature attributes window appear and you can start adding data:

.. figure:: images/tdh_pipe_section_form.JPG

Select the function of the pipe_section you want (preselected is 'connection_pipe'):

- connection_pipe
- supply_pipe
- transport_pipe

.. note:: Keep in mind that the finishing point of the line is the last point where you **left** clicked.
  Thus, for digitizing a simple line with 2 points you need two **left clicks** to digitize the line and one
  **right click** to finish the line digitizing.


.. note:: If you do not enter an `name_number` identifier on this form, TDH will enter the `obj_id` also as identifier (you can change later).

* When finished, then click the **OK** button.

* Save the information of this layer by selecting the Floppy icon in the menu bar.

You can re-edit your polygon object selecting the edit mode and then click with the info cursor on the object you want to edit.
If you do not select the edit mode, you can just look at the existing data.

For detailed information about editing see the :ref:`editing-data` chapter.