Abstract
Three-dimensional models are required to virtualize heritage sites. In recent years, different techniques that ease their generation have been consolidated, such as photogrammetry with Unmanned Aerial Vehicles (UAVs). Nonmetric cameras allow relatively inexpensive data collections. Traditional aerial photogrammetry has established methodologies, but there are not commonly used recommendations for the selection of parameters when working with UAV platforms. This research applies the Taguchi Design of Experiments Method, with four parameters (height of flight, forward and lateral overlaps, and inclination angle of the sensor) and three levels (L9 matrix and nine flights), to determine the set that offers the best metric goodness and, therefore, the most faithful model. The Roman civitas of Juliobriga (Cantabria, North of Spain) was selected for this experiment. The optimal flight results of the average signal-to-noise ratio analysis were height of 15 m, forward and lateral overlaps of 80%, and inclination of 0° (nadiral). This research also highlights the noticeable contribution of the inclination in the accuracy of the model with respect to the others, which is 16.4 times higher than that of the less relevant one (height of flight). This leads to propose avoiding inclination angle as a variable, and the sole development of nadiral flights to obtain accurate models.
Highlights
Received: 8 December 2020In recent years, digital images and videos have allowed the consideration of virtualization as a tool to ease the access of visual information of objects/territories
When setting the parameters of a photogrammetric flight developed with Unmanned Aerial Vehicles (UAVs) aimed at the acquisition of information for the virtualization of objects/territories, the control of the UAV itself must be taken into account
It is worth noting that the measurement of distance of the eight stadias was not possible for all the designed flights due to the luxuriance of the grass
Summary
Received: 8 December 2020In recent years, digital images and videos have allowed the consideration of virtualization as a tool to ease the access of visual information of objects/territories. It is easy to obtain virtual itineraries that permit the visualization of all types of locations, providing a tremendously accurate image of the place that is visited, even if it is miles of kilometers away from the user This virtualization provides a large number of advantages, and, the accessibility to information may be the most important one, since after the virtualization, it can be broadcasted in a practically worldwide way, there is another one of great importance. If the virtualization is developed in an appropriate way, it does allow a visual replication of all the elements that exist on a certain location and their metric representation This permits agents to prospect, investigate, manage, or even reproduce the asset. Due to all these reasons, the metric aspects are so important for a virtual recreation
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