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Data collection methods

The collection process when considering the data needed, can be split into two catergories.
The collection of data at the location the basic principle is collecting the data directly on site (primary data), whereas Data collection using existing information (secondary data) is also possible.

  • Data collection methods
  • Alphanumeric database

    is the equivalent to a type of written inventory but stored in a computer. Independently to the geometry of an object can furnishings, instruments, materials, conditions and other information be collected and described.

    Collecting data by hand

    Is technically the easiest and thereby most popular way to gain measured data. It is perfectly suited to collecting easy geometry. Using a handheld edm device it is possible for a person to measure longer distances alone. Measuring complex rooms by hand is a lot more time consuming and in some instances more difficult.

    Total Stations

    have in the past years established themselves as one of the most accurate and efficient ways to obtain coordinate geometry. An instrument which measures distances as well as vertical and horizontal angles. This instrument has revolutionised the surveying world and made many aspects of surveying not just more accurate but also more manageable

    Photogrammetry

    is a collective term for different methods of photo analysis and measurement. Important to note is that this method of data collection is secondary and is influenced by many factors which must be taken into account. This method is then used when a lot of detail is required.

    Laserscanning

    is a process, which can in a relatively short space of time measure a huge amount of single points. The result of this process is a three-dimensional point cloud, that portrays the surrounding of the instrument.

    Vectorisation

    of digital paper plans is when first percieved the quickest and cheapest way to producing a CAD-drawing of a property. The very poor accuracy as well as the uncertainty based on how actual the data is, make this form of data collection and processing only worthwhile in a few areas. For the presentation of room objects is this process acceptable. By this process one must be careful when calculating areas and volumes .