AUTONOMOUS SURVEYING OF UNDERFLOOR VOIDS

The present disclosure provides a method of processing depth data and image data from a robotic device having a camera and a depth measurement device mounted to a chassis of the robotic device to generate a data set representative of a three-dimensional map of an environment in which the robotic device is located. The camera is arranged to generate image data relating to the environment. The depth measurement device is arranged to generate depth data relating to the environment. The method comprises generating image data and depth data at a first location of the robotic device in the environment, whereby to generate a first data set comprising a plurality of data points. The method further comprises moving the robotic device to at least a second location in the environment. The method further comprises generating image data and depth data at the second location, whereby to generate a second data set comprising a plurality of data points. The method further comprises associating each data point of the first data set with the spatially nearest point of the second data set, if any, within a predefined distance from the first data point. The method further comprises replacing data points from the first data set with the associated data points from the second data set by reference to the distance of the data point from the location of the robotic device when the data point was generated.