This theme is used for documentation and evaluation of geological attributes of the heading face. Besides general descriptions the user can input data for lithology, discontinuities, hydrology, rock samples (together with detailed analysis results) and a lot more. 2doc provides the possibility to import and digitize heading face sketches - that way the main aspects of the sketch can be transformed into queryable digital information, i.e. the areas of the documented lithological units on the heading face can be calculated automatically by 2doc using data provided by the digitalization. Furthermore 2doc automatically generates intersection lines (Structural data, Lithology) as construction basis for geological horizontal and vertical sections.

With this theme areas of similar geological conditions can be defined along the axis of the tunnel. The type of the homogeneous division as well as the characteristics associated with that type can be freely defined by the user. Applications of this theme are numerous i. e. it can be used for recording tectonical or lithological units or for recording hydrological homogeneous divisions. Other data collected in 2doc can be evaluated with respect to these homogeneous divisions. A good example would be the evaluation of fabric data as great circle diagrams in the 2doc tunnel tape where all discontinuities within a defined homogeneous division can be shown in one diagram.

The theme geological descriptions allows the description of geological features that are related to larger sections along the tunnel axis. I.e. the theme can be used to document rock mass or bedrock but can also be used to describe other characteristics like the prognosed influence on a parallel tunnel etc. A main field of application of this theme is the documentation of geological features coming out of the prognosis documents. This way the prognosis data can be juxtaposed with the actual condition documented while driving the tunnel (for instance from the theme geological heading face documentation). Each documented section can be classified using a type and a characteristic within that type complemented by descriptive text and external documents.

Analog to the geological heading face documentation this theme can be used to document the tunnel wall of sections along the tunnel axis. Thereby 2doc provides three different ways of documentation: Documentation of horizontal or vertical sections, documentation of the unwinded tunnel wall as well as the documentation of projection planes. Besides general descriptions the user can input data for lithology, discontinuities, hydrology, rock samples (together with detailed analysis results) and a lot more. From the tunnel axis the assigned profile 2doc calculates the shape of the documented plane. This way sketches done on paper can be scanned and imported and georeferenced directly in 2doc. As with the theme geological heading face documentation input forms and reports can be adapted to the specific geological environment of the tunneling project. This allows an efficient collection and adapted presentation of data.

The theme RMR Classification is used for documenting the properties of bedrock according to the classification of Bieniawski. 2doc allows a simple and efficient collection of the RMR parameters for sections along the tunnel axis. The calculation of the associated indices is done automatically. For specific adaption of the Bienawski classification to the geological environment 2doc provides appropriate configuration possibilities that modify the weighting of the classes when calculating the index.

If orthophotos - that are georeferenced deskewed digital images - of the heading face are available, these photos can be integrated in 2doc by the use of this theme. The photos are stored georeferenced in the 2doc database and can therefore optionally be used as background image in different visualizations. A prominent example would be the presentation of the vector diagram in the theme 3D subsurface measurement that allows the display of heading face orthophotos. This way the geological situation at the specific position in the tunnel can be presented alongside the movement of the measuring points - a valuable input for interpretation of the collected data.