Research on the motion behaviour of arctic glaciers provides important information about the influence of global temperature changes on the climate system and especially the global sea level rise. In the past years dramatic changes could be observed for some of the Greenland outlet glaciers. Jacobshavn Isbrae is one of the fastest and most productive glaciers in Greenland and is therefore an in...

We have developed a new concept of empirical calibration scheme for airborne laser scanner (ALS) intensity by means of portable brightness calibration targets, which can be laid out in the flight target area. The accurate radiometric calibration of these targets is based on laboratory measurements with CCD-based laser backscatter instrument and terrestrial laser scanner reference measurements i...

Terrestrial laser imaging systems offer a new means for rapid precise mapping of objects up to ranges of up to a few hundred metres from the instrument location. The high sampling frequency (e.g., several kilohertz) available from such instrumentation can provide a spatial data density of directly observed co-ordinates far in excess of that available with photogrammetric techniques. For structu...

This paper presents a new method for constructing quickly and automatically precision tree models from point clouds of the trunk and branches obtained by terrestrial laser scanning. The input of the method is a point cloud of a single tree scanned from multiple positions. The surface of the visible parts of the tree is robustly reconstructed by making a flexible cylinder model of the tree. The ...

Bridge structures are subjected to deterioration due to excessive usage, overloading, and aging material. For the last two decades, a significant amount research has been developed for collecting data for structural health monitoring. Yet, visual investigation with an on-site inspector remains the predominant method. This is true despite the highly subjective and time consuming aspects of this ...

For the representation of objects or scenes different representation forms are utilised. While for some tasks a point cloud representation or a triangulation of the point cloud is sufficient, a boundary representation or a wireframe model is necessary for other applications. For these the determination of feature lines is essential. In the past the generation of feature lines was a manual task....

Recent advances in Light Detection And Ranging (LiDAR) enable digital acquisition and storage of the entire waveform of backscattered laser pulse energy. Pre-requisites for extracting target radiometric and geometric properties via waveform analysis include defining a model for accurately determining peaks in the return energy waveform and a method for transforming waveform peak amplitudes to a...