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All Outputs (57)

The Douglas-Peucker algorithm for line simplification: Re-evaluation through visualization (1990)
Journal Article
Visvalingam, M., & Whyatt, J. D. (1990). The Douglas-Peucker algorithm for line simplification: Re-evaluation through visualization. Computer graphics forum : journal of the European Association for Computer Graphics, 9(3), 213-225. https://doi.org/10.1111/j.1467-8659.1990.tb00398.x

The primary aim of this paper is to illustrate the value of visualization in cartography and to indicate that tools for the generation and manipulation of realistic images are of limited value within this application. This paper demonstrates the valu... Read More about The Douglas-Peucker algorithm for line simplification: Re-evaluation through visualization.

Trends and concerns in digital cartography (1990)
Journal Article
Visvalingam, M. (1990). Trends and concerns in digital cartography. Computer aided design, 22(3), 115-130. https://doi.org/10.1016/0010-4485%2890%2990070-s

Digital cartography is the technology concerned with the construction and use of computer-based systems for the practice of cartography and its applications. The paper starts with a brief introduction to cartography and cartographic maps. It then pro... Read More about Trends and concerns in digital cartography.

The Douglas-Peucker algorithm for line simplification : re-evaluation through visualisation (1989)
Preprint / Working Paper
Visvalingam, M., & Whyatt, J. D. The Douglas-Peucker algorithm for line simplification : re-evaluation through visualisation

The primary aim of this paper is to illustrate the value of
visualization in cartography and to indicate that tools for the
generation and manipulation of realistic images are of limited value
within this application. This paper demonstrates the v... Read More about The Douglas-Peucker algorithm for line simplification : re-evaluation through visualisation.

Management of digital map data using a relational database model (1989)
Preprint / Working Paper
Visvalingam, M., & Sekouris, N. M. Management of digital map data using a relational database model

This end-of - grant report formally concludes the OS/CISRG
collaboration on the one year project entitled "Management of Digital
Map Data Using a Relational Database Model". This introductory
section provides the background to the project, an over... Read More about Management of digital map data using a relational database model.

Cartography, geographical information systems and maps in perspective (1988)
Preprint / Working Paper
Visvalingam, M. Cartography, geographical information systems and maps in perspective

From the Introduction:
The aims of this paper are two-fold. The paper seeks to provide
support for the ICA proposition that there is a need to redefine
cartography and maps. It then explores the various issues which may
either provide guidelines... Read More about Cartography, geographical information systems and maps in perspective.

Directory of research and development based on Ordnance Survey small scales digital data (1987)
Book
Visvalingam, M., & Kirby, G. (1987). Directory of research and development based on Ordnance Survey small scales digital data. University of Hull

From the Foreword:
Although Digital Topographic Data can be used to assist in the
production of some Ordnance Survey (OS) maps it has been clear
for some years that the justification for the capture of digital
data has to be that users require it... Read More about Directory of research and development based on Ordnance Survey small scales digital data.

Problems in the design and implementation of a GKS-based user interface for a graphical information system (1987)
Preprint / Working Paper
Visvalingam, M. Problems in the design and implementation of a GKS-based user interface for a graphical information system

State-of-the-art Graphical (mainly Geographical)
Information Systems (GIS) began life in the early 1970s and
are now well established on multi-user computer systems.
They support the capture, storage, retrieval, mathematical
manipulation and disp... Read More about Problems in the design and implementation of a GKS-based user interface for a graphical information system.

From line geometry to area topology (1986)
Preprint / Working Paper
Kirby, G. H., Visvalingam, M., & Wade, P. R. From line geometry to area topology

Area objects are represented on a computer by geometric or locational information (which describe the course of their boundaries), topological information (which describe the areal units to which boundaries belong), and geographic or other informatio... Read More about From line geometry to area topology.

Proceedings of the meeting on Research based on Ordnance Survey small-scales digital data (1986)
Presentation / Conference Contribution
(1986, January). Proceedings of the meeting on Research based on Ordnance Survey small-scales digital data. Presented at Annual Conference of the Institute of British Geographers, Reading

Preface:
Ordnance Survey digital data captured from 1:50 000 or smaller scale source maps will differ from the coded features of the large scale data in that it will be node structured and should thus support research of a methodological and applied... Read More about Proceedings of the meeting on Research based on Ordnance Survey small-scales digital data.

The signed Chi-score measure for the classification and mapping of polychotomous data (1981)
Journal Article
Visvalingam, M. (1981). The signed Chi-score measure for the classification and mapping of polychotomous data. The Cartographic journal, 18(1), 32-43. https://doi.org/10.1179/caj.1981.18.1.32

Several polychotomous characteristics, when expressed in chi-score form, exhibit distributions in property space which deviate from the inherent assumptions of the more commonly used methods of cluster analysis. This paper suggests a novel approach t... Read More about The signed Chi-score measure for the classification and mapping of polychotomous data.

Making a national atlas of population by computer (1980)
Journal Article
Rhind, D. W., Evans, I. S., & Visvalingam, M. (1980). Making a national atlas of population by computer. The Cartographic journal, 17(1), 3-11. https://doi.org/10.1179/caj.1980.17.1.3

This paper describes the conceptual and practical problems encountered and solved in producing a multi-colour atlas of population characteristics in Great Britain. The atlas itself is in A4 format; it consists of some thirty-four maps of Great Britai... Read More about Making a national atlas of population by computer.

The signed Chi-square measure for mapping (1978)
Journal Article
Visvalingam, M. (1978). The signed Chi-square measure for mapping. The Cartographic journal, 15(2), 93-98. https://doi.org/10.1179/caj.1978.15.2.93

When interest extends beyond purely univariate considerations there is no fixed rule governing the ordering of spatial samples for mapping and statistical analysis. Ratios and numerical differences have conventionally been the basis for comparing sam... Read More about The signed Chi-square measure for mapping.

Indexing with coded deltas—a data compaction technique (1976)
Journal Article
Visvalingam, M. (1976). Indexing with coded deltas—a data compaction technique. Software: Practice and Experience, 6(3), 397-403. https://doi.org/10.1002/spe.4380060313

The paper describes the coded delta scheme, which is one of the methods used by the Census Research Unit, University of Durham, for compacting the 1971 U.K. census data. It evaluates the merits and limitations of the technique in relation to the char... Read More about Indexing with coded deltas—a data compaction technique.

Well-point techniques and the shallow water table in boulder clay (1974)
Journal Article
Visvalingam, M., & Visvalingam, M. (1974). Well-point techniques and the shallow water table in boulder clay. The Journal of soil science, 25(4), 505-516. https://doi.org/10.1111/j.1365-2389.1974.tb01145.x

The reliability of water-table measurements in clay soil is currently under review (Twocock, 1971; Bonell, 1971; Visvalingam, 1972). This paper summarizes some of the experimental results from a boulder clay catchment in East Yorkshire. The experimen... Read More about Well-point techniques and the shallow water table in boulder clay.

The neutron method for measuring soil moisture content - a review (1972)
Journal Article
Visvalingam, M., & Tandy, J. D. (1972). The neutron method for measuring soil moisture content - a review. The Journal of soil science, 23(4), 499-511. https://doi.org/10.1111/j.1365-2389.1972.tb01680.x

THE various methods of measuring the soil moisture content and its variations in space and time have been reviewed by many authors (Taylor, 1955; Marshall, 1959; Todd, 1960; Ballard and Gardner, 1965; Cope and Trickett, 1965). The moisture content is... Read More about The neutron method for measuring soil moisture content - a review.