منابع مشابه
A Quality Assessment of Repeated Airborne Laser Scanner Observations
This paper describes the height and planimetric errors of repeated ALS (airborne laser scanning) strips with a deeper focus on building extraction. Measurements with Toposys Falcon airborne laser scanner were arranged in May 2003 in Espoo, Southern Finland. A 5 km test area, consisting of urban settlements and forests, were collected from the altitude of 400 m resulting in measurement density o...
متن کاملObservations of gravel beach dynamics during high energy wave conditions using a laser scanner
A 2D laser-scanner was deployed at the high tide runup limit of a pure gravel beach (Loe Bar, Cornwall, England) to measure high-frequency (2.5 Hz) swash hydrodynamics and topographic changes during an energetic wave event. Measurements performed with the laser-scanner were corrected to compensate for levelling and orientation errors, and a variance threshold was applied to separate the beach t...
متن کاملLuminous Phenomena of Earthquakes: Observations and Theories
Over the past few years, different theories (piezoelectric, positive holes, friction-vaporization, exo-electron emission, tribo- or fracture electrification) have been presented for the interpretation of earthquake lights. Although these theories can interpret earthquake luminous, each suffer from particular problems. There are also ambiguities and questions about the location of the light, the...
متن کاملCharacterization of Scanner Sensitivity
Color scanners are becoming quite popular as input devices for desktop publishing. In many applications it is desirable to obtain calibrated color from them. In order to properly calibrate the device for a variety of illuminants, it is necessary to estimate the spectral sensitivity of the scanner. This paper describes a set theoretic approach to this problem. This method is shown to have increa...
متن کاملApplication of Airborne Laser Scanner
This dissertation explores the use of an Airborne Laser Scanner (ALS) for various types of aircraft Terrain-Referenced Navigation (TRN) techniques. Using the methods explored, an ALS-based TERRain Aided Inertial Navigator (TERRAIN) was developed, flight tested, and shown capable of providing meter-level positioning accuracy in real-time. The ALS-based TRN techniques discussed are constrained to...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1965
ISSN: 0252-9211
DOI: 10.1017/s0252921100118342