## 5 Data Processing  
In general, the use of laser scanning in the documentation of monuments has become very widespread, but it has also brought a large increase in data [34,35]. Over 48 GB of data were acquired in five days, including photographic ones. The schematic procedure is shown in Figure 7. The BLK360 is a highly sophisticated device aimed at maximum simplicity. However, if you take dozens of scans, they cannot be processed online on the tablet. The data are further processed almost fully automatically in the Leica Cyclone REGISTER 360 software (BLK Edition) without much possibility to influence the process. At best, the scans are automatically joined based on the correlation and a report is created. However, it is necessary to make a large overlap of scans, which can only be based on experience. For simple objects, the scans join well automatically based on overlap, typically more than 50% for more complex ones, sets of joined scans are created, which must be joined into one manually via tie points. However, the result is a relatively high-quality 3D model with texture. Any vectorization must be done in other software like REVIT for example; BLK360 is primarily intended for quality 3D models. The situation is different for the ZEB-REVO--this device is intended to create plans or as an input for BIM. The device automatically saves the data after the measurement, which is simply transferred via cable and USB to a computer and uploaded directly in compressed form to the GeoSLAM HUB software. A 3D model is created here; this can be transferred by mouse-clicking to another module, where a floor plan and two side views are created. However, the simplest ZEB-REVO model does not have a camera and you cannot see what is being scanned; this can have processing consequences. With long and complicated object documentation, such as a narrow high tower or a very large object, the partial bifurcation of the resulting model can occur due to the accumulation of errors from the IMU. In general, however, automatic processing can affect parameters; their setup is a matter of experience. When documenting an object, a vector model is usually required as a result, most often as a floor plan and cross-sections. The Geoslam software serves as a \"Draw\" module, which allows the vectorization of the created orthogonal projections of the point cloud to floor plan and to defined point cloud cross-sections. Next, a vectorization procedure can be applied, which works semi-automatically. It is necessary to define the amount of vectorized information by data thresholding before starting automatic vectorization. This procedure finds vectors automatically, but for complex and irregular objects, especially historical ones, it is necessary to edit the result, often fundamentally. Even so, it is possible to create a floor plan of the building in a few hours. Figure 8: Laser scanner BLK360 during the measurement inside the _mellah_. From the point of view of close-range photogrammetry in the IBMR (SfM) form, the situation is known; if enough of overlapping images is taken, a 3D textured model in form of point cloud and textured mesh can be created based on image correlation. The number of photos taken depends on which camera was used, mainly on camera-lens, the size and complexity of the documented object and the required accuracy and detail of the output, and on the possibilities of access to the object. You can use several types of professional software, such as Metashape, Zephyr, etc. [36; 37]. Many authors have compared the performance and results of various software for close-range photogrammetry [38]. There is also open-source software like Mic-Mac, Bundler, Photosynth, 123 catch, etc., which can be successfully used as a low-cost photogrammetric solution; in this case, only both suitable digital camera and a computer are necessary. If hundreds of pictures were taken, it is necessary to use an efficient workstation and the process can take hours.