Filtering Method of Airborne Laser Scanner Data by Entropy
نویسندگان
چکیده
منابع مشابه
Robust Filtering of Airborne Laser Scanner Data for Vegetation Analysis
Airborne laser scanning (ALS), often referred to as lidar or laser altimetry, is a remote sensing technique which was originally designed to measure the topography of the Earth’s surface. While the first commercially available airborne laser scanners recorded only the time of one backscattered pulse, state-of-the-art systems record several echoes for each emitted laser pulse. Thereby a 3D data ...
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The extraction of points on the bare Earth from point clouds acquired by airborne laser scanning is the most time consuming and expensive part in the production of digital elevation models with laser scanning. Current algorithms for filtering point clouds assume the Earth’s surface to be continuous in all directions. This assumption leads to smoothed terrain representations in case of height di...
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 کاملA Quality Assessment of Airborne Laser Scanner Data
A Toposys-1 airborne laser scanner (ALS or LIDAR) measurement campaign was arranged in June 2000 (Kalkkinen) and another campaign with helicopter-borne TopEye laser scanner was arranged in September 2002 in southern Finland (Masala, Otaniemi). The Toposys flying altitudes were about 400 and 800 m above ground and for the TopEye, 100, 200, 400 and 550 m flying altitudes were used. Reference meas...
متن کاملThree-dimensional Modelling of Breaklines from Airborne Laser Scanner Data
Airborne laserscanning allows a very detailed sampling of the landscape within a more or less automated recording procedure. For the representation of models computed on the basis of this data mostly raster or triangulated irregular networks (TINs) are used, which do only implicitly store breakline information. For high quality surface modelling breaklines must be explicitly stored within the d...
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ژورنال
عنوان ژورنال: Journal of the Japan society of photogrammetry and remote sensing
سال: 2009
ISSN: 0285-5844,1883-9061
DOI: 10.4287/jsprs.48.235