This letter introduces the spatial ambiguity functions (SAF's) and discusses their applications to direction finding and source separation problems. We emphasize two properties of SAF's that make them an attractive tool for array signal processing.

Abstract: As technologies permitting both the creation and retrieval of data containing spatial information continue to develop, so do the number of visualizations using such data. This spatial information will often comprise a place name that may be "geocoded" into coordinates

Abstract not found

; Picton and Stuss 1980; Sutton and Ruchkin 1984) because of the biophysical fact that different potential field distributions on the scalp indicate different spatial configurations of intracranial cur-rent sources (Vaughan 1982; Wood 1982; Wood et al. 1984). This interpretation assumes, of course

In this paper, we explore the spatial distribution of the referents of ambiguous toponyms and compare it to the distribution of randomly selected unambiguous toponym pairs. We show that for a number of gazetteers, ambiguous toponyms are spatially autocorrelated and that typical autocorrelations

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-processing). In this work, we propose a method that combines OCR-based text recognition in raster-scanned maps with heuristics specially adapted for cartographic data to resolve the recognition ambiguities using, among other information sources, the spatial object relationships. Our goal is to form in the vector thematic

The emergent nature of structure is a crucial, but often ignored, constraint on authoring hypertexts. VIKI is a spatial hypertext system that supports the emergent qualities of structure and the abstractions that guide its creation. We have found that a visual/spatial metaphor for hypertext allows

between components of the representation. This paper describes the two main purposes of spatial parsers in spatial hypermedia systems and how particular parsing approaches and features influence their effectiveness and responsiveness. An alternative approach that provides better support for ambiguity

Ambiguous visual stimuli highlight the constructive nature of vision: perception alternates between two plausible interpretations of unchanging input. However, when a previously viewed ambiguous stimulus reappears, its earlier perception almost entirely determines the new interpretation; memory