3.2.1. Data entry

There are basically two ways:

• Data entry by constructing or digitizing in a TDH-project with the QGIS-tools itself

• Data entry in an external program or software and then importing the position and/or technical data into TDH e.g.:

  • coordinates from manholes from measurement

  • position and/or technical data from another GIS or CAD system

  • using data from the surveyor (e.g. property boundaries) as a basis for defining catchment borders

  • other

Data entry in TDH needs some understanding of the underlying data model `SIA 405`_, but is supported with forms that link the different tables correctly together.

3.2.1.1. QGIS standard tools

To digitize th network elements, you need to work with the standard QGIS tools:

• Select the layer you want to edit

• Toggle Editing if necessary

• Enable snapping if necessary

• Choose the add feature tool