Fuzzy objects for geographical information systems

Cross, Valerie; Firat, Aykut

doi:10.1016/s0165-0114(99)00010-x

Cited by 80 publications

(22 citation statements)

References 26 publications

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“…Much of the subsequent work has focused on sub-and super-State scale regions in the US (for a review, see Shortridge, 1987), though as the examples above show there is also a great richness to be found at the community and small-group level. Plainly such features are a subset of the more general division of cognitive spatial objects and therefore fit well within the current research trend that aims to explain and manipulate all geographical features as perceived entities given a semantic solidity and manipulated within an ontological framework (for examples and reviews, see Cross and Firat, 2000;Mennis, 2003;Agarwal, 2005).…”

Section: The Nature Of Vernacular Areassupporting

confidence: 56%

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Mapping vernacular geography: web-based GIS tools for capturing 'fuzzy' or 'vague' entities

Evans

Waters

2007

IJTPM

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Most people don't use a formal geographical vocabulary, however they do use a wide variety of geographical terms on a daily basis.Identifiers such as "Downtown" are components of a vernacular geography which is vastly more used than the coordinates and scientifically defined variables beloved of most professional analysts. Terms like these build into the jointly-defined world-views within which we all act. Despite its importance for policy making and quality of life, attention is rarely paid to this vernacular geography because it is hard to capture and use. This paper presents tools for capturing this geography, an example of the tools' use to define "High Crime" areas, and an initial discussion of the issues surrounding vernacular data. While the problems involved in analyzing such data are not to be underestimated, such a system aims to pull together professional and popular geographical understanding, to the advantage of both.

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Section: The Nature Of Vernacular Areassupporting

confidence: 56%

“…Equally, such attribute information can provide the input into a more formal cognitive/semantic/ontological GIS (for reviews see Mennis, 2003;Cross and Firat, 2000;Agarwal, 2005).…”

Section: Discussionmentioning

confidence: 99%

Mapping vernacular geography: web-based GIS tools for capturing 'fuzzy' or 'vague' entities

Evans

Waters

2007

IJTPM

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“…Without baseline test data, it is also difficult to produce error descriptions using alternative, fuzzy models (Altman 1994;Cross and Firat 2000), because this approach also relies on functions to describe error distributions. However, the law of error propagation, using standard errors, as well as fuzzy methods would be useful for determining error contributions for different coordinate sources (maps, gazetteer, and GIS layers, for example) where test data are available.…”

Section: Discussionmentioning

confidence: 99%

The point-radius method for georeferencing locality descriptions and calculating associated uncertainty

Wieczorek

Guo

Hijmans

2004

International Journal of Geographical Information Science

324

319

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Natural history museums store millions of specimens of geological, biological, and cultural entities. Data related to these objects are in increasing demand for investigations of biodiversity and its relationship to the environment and anthropogenic disturbance. A major barrier to the use of these data in GIS is that collecting localities have typically been recorded as textual descriptions, without geographic coordinates. We describe a method for georeferencing locality descriptions that accounts for the idiosyncrasies, sources of uncertainty, and practical maintenance requirements encountered when working with natural history collections. Each locality is described as a circle, with a point to mark the position most closely described by the locality description, and a radius to describe the maximum distance from that point within which the locality is expected to occur. The calculation of the radius takes into account aspects of the precision and specificity of the locality description, as well as the map scale, datum, precision and accuracy of the sources used to determine coordinates. This method minimizes the subjectivity involved in the georeferencing process. The resulting georeferences are consistent, reproducible, and allow for the use of uncertainty in analyses that use these data.

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“…Recent efforts have been paid on the establishment of consistent framework for a fuzzy object-oriented model based on the standard for the object data management Ž . 25,26 group ODMG object data model. The design of fuzzy relational databases with the fuzzy ER model 2 has been investigated in Ref.…”

Section: Related Workmentioning

confidence: 99%

Conceptual design of fuzzy object-oriented databases using extended entity-relationship model

Zhang

et al. 2001

Int. J. Intell. Syst.

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Entity-relationship ᎐extended entity-relationship models play a crucial role in the conceptual design of relational databases as well as object-oriented databases. Recently, several Ž . approaches have been proposed to enhance object-oriented databases OODBs using fuzzy set theory. In this paper, we introduce a fuzzy extended entity-relationship model to cope with imperfect as well as complex objects in the real world at a conceptual level. In particular, we provide the formal approach to mapping a fuzzy extended entity-relationship model to a fuzzy object-oriented database schema. ᮊ

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Fuzzy objects for geographical information systems

Cited by 80 publications

References 26 publications

Mapping vernacular geography: web-based GIS tools for capturing 'fuzzy' or 'vague' entities

Mapping vernacular geography: web-based GIS tools for capturing 'fuzzy' or 'vague' entities

The point-radius method for georeferencing locality descriptions and calculating associated uncertainty

Conceptual design of fuzzy object-oriented databases using extended entity-relationship model

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