Digital aerial photography acquired with unmanned aerial vehicles (UAVs) has great value for resource management due to flexibility and relatively low cost for image acquisition. The very high resolution imagery (5 cm) allows for mapping bare soil and vegetation types, structure and patterns in great detail. While image acquisition is relatively straightforward, the creation of orthorectified, ...

To build HiRISE image network with the best possible precision and accuracy, technical issues involving sensor geometry and absolute positioning need to be resolved. High-frequency random patterns, or “jitter”, in the rotation angles cause disagreements between HiRISE CCDs. To generate seamless topographic products, it is important to achieve coherence in the exterior orientation parameters bet...

This paper presents techniques for automatic mapping of Mars landing sites using surface-based images, i.e., those taken by Mars landers and/or rovers. An innovative method for automatic tie point selection is presented that includes five steps: interest point extraction, interest point matching, parallax verification, graph consistency verification and final tie point selection with gridding. ...

Highly organized, universal structures underlying biological and technological networks mediate effective trade-offs among efficiency, robustness and evolvability, with predictable fragilities that can be used to understand disease pathogenesis. The aims of this article are to describe the features of one common organizational architecture in biology, the bow tie. Large-scale organizational fra...

BACKGROUND Pulmonary hypertension (PH) is a lethal disease that is associated with characteristic histological abnormalities of the lung vasculature and defects of angiopoetin-1 (ANG-1), TIE-2 and bone morphogenetic protein receptor (BMPR)-related signalling. We hypothesized that if these signalling defects cause PH generically, they will be readily identifiable perinatally in congenital diaphr...

VLMS is a mobile mapping system, where three single-row laser range scanners, six line CCD cameras as well as a GPS/INS based navigation unit are mounted on a van, measuring object geometry as well as texture along the street. This paper contributes to a method of fusing the data output of VLMS with existing geographic data sources, where focus is cast on the rectification of GPS/INS parameters...

This paper describes a general model for CCD linear array sensors with along-track stereo viewing. The sensor external orientation, which is different for each image line, is modelled with time-dependent piecewise polynomial functions and integrated in the standard photogrammetric triangulation, resulting in an indirect georeferencing model. The continuity of the functions and their first and s...