Objective extraction of channel heads from high-resolution topographic data

Channel network extraction from high resolution topography using wavelets

[1] The availability of high resolution topography from LIDAR offers new opportunities for objectively extracting the channels directly from a DEM using local topographic information, instead of inferring them indirectly based on global criteria, such as area or area-slope threshold relationships. Here we introduce the use of wavelet filtering to delineate threshold curvatures for defining vall...

The LiDAR-side of Headwater Streams Mapping Channel Networks with High-resolution Topographic Data

Extraction of buildings from high resolution satellite data

This paper describes the methods that can be used to detect building objects under the circumstances of high object density and scene complexity seen in 1-metre high resolution satellite imagery. In order to reduce the building hypothesis space in early processes, a local Fourier analysis does an analysis of the dominant orientation angle in a building cluster. This serves to extract the focuse...

Extraction of Buildings from High-resolution Satellite Data and Lidar

Acquiring accurate detection and description of buildings is a difficult object recognition problem due to a high complexity of the scene content and the object representation. Since most urban scenes deliver very rich information, a robust separation of fore (objects to be reconstructed) from background (irrelevant features) is an essential process in object recognition system, but is difficul...

Object-Oriented Method for Automatic Extraction of Road from High Resolution Satellite Images

As the information carried in a high spatial resolution image is not represented by single pixels but by meaningful image objects, which include the association of multiple pixels and their mutual relations, the object based method has become one of the most commonly used strategies for the processing of high resolution imagery. This processing comprises two fundamental and critical steps towar...