Showing papers in "Cartographic Journal in 1988"
TL;DR: This paper proposes a new algorithm based on selecting local maxima and minima for contour lines digitised in a stream mode based on evaluating the efficiency of existing algorithms and suggesting new ones.
Abstract: When contour lines are digitised in a stream mode, excessive data is generated. Some algorithms are needed to remove this excess. In this paper, these algorithms are reviewed and compared, and finally a new algorithm is proposed based on selecting local maxima and minima.
26 citations
TL;DR: In this paper, the use of specialised symbols superimposed on a base map enables safe, quick and independent mobility of the physically disabled population, but does a pictorial representation of disability become psychologically demoralising to the user?
Abstract: Maps are generally used for territorial interpretation by the able-bodied population. The same principle has been used in this study to improve the mobility of the physically disabled population. The use of specialised symbols superimposed on a base map enables safe, quick and independent mobility. The physical barriers can be broken down, but does a pictorial representation of disability become psychologically demoralising to the user? The success of the map under discussion depends on whether the social barriers can be broken down too.
10 citations
TL;DR: A new algorithm based on finding the zero-crossings of the convoluted values of the second derivative of the Gaussian with the signal derived from the raster data is given.
Abstract: The problem of critical points detection is important not only in the field of cartography but also in pattern recognition, image processing, computer vision, and artificial intelligence. In this paper, a new algorithm for critical points detection in raster data is given. The algorithm is based on finding the zero-crossings of the convoluted values of the second derivative of the Gaussian with the signal derived from the raster data. In addition, the results of the critical points detected by this algorithm are compared with those selected by humans. Moreover, the importance and usefulness of critical points detection in digital curves is outlined.
6 citations
TL;DR: The development of mapping in Palestine paralleled increasing interest by Western nations in the area as mentioned in this paper and the growth of a range of maps for an important area of the Holy Land is exemplified.
Abstract: The development of mapping in Palestine paralleled increasing interest by Western nations in the area. By concentrating on the city of Jaffa, the growth of a range of maps for an important area of the Holy Land is exemplified. Cartography by nations, armies, companies and individuals was undertaken for political/military, religious, survey and legal and economic purposes. A bibliography of maps is given.
4 citations
TL;DR: Objectives are outlined that all potential 'mapmakers' should be aware of the basic principles governing both 'optimal mapping' and 'cartographic design'.
Abstract: As it becomes increasingly possible for a 'non cartographer' to easily produce maps by means of digital systems, whether they use a 'mapping package' or Geographical Information System, concern is expressed over the quality of the resultant level of communication achieved by the map. It is suggested that all potential 'mapmakers' should be aware of the basic principles governing both 'optimal mapping' and 'cartographic design'. This paper outlines these objectives.
3 citations
TL;DR: A light-hearted account of the kinds of maps used, and required by British mountaineers, is given in this article, with a background paper for the Working Group of "Mountain Maps" held in Glasgow in September 1987.
Abstract: A light-hearted account of the kinds of maps used, and required by British mountaineers. A background paper for the Working Group of "Mountain Maps" held in Glasgow in September 1987
3 citations
TL;DR: The shape, form and pace of the development of Scottish geological cartography during the first half of the nineteenth century are described in this paper, where the part played by Scottish scientific societies in publishing geological maps is assessed, comparison being made with that of the Geological Society of London.
Abstract: The shape, form and pace of the development of Scottish geological cartography during the first half of the nineteenth century are described. The part played by Scottish scientific societies in publishing geological maps is assessed, comparison being made with that of the Geological Society of London. The attempts made to devise graphic representations of the strata, and the problems encountered in publishing the results, are also discussed.
2 citations
1 citations
TL;DR: In the early 1970s, the AA Cartographic Department had a very good case for production by means of computer aided techniques as discussed by the authors, and the benefits of data analysis, data structure and digitisation became clear.
Abstract: INTRODUCTION The commercial companies engaged in the publishing of small scale mapping have been watching the development of computer aided cartography for many years. The subjects of papers presented to the British Cartographic Society at its annual symposium and winter lectures have gradually changed from a miscellany of topics to the almost total domination by computer allied areas. It has been a slow and gradual learning curve for those engaged in an arena influenced by production schedules, presentation and profit. It has also been difficult for us to appreciate how the stark, and frankly often ugl~, output from automatic pen plotters could have a beanng on a small industry that depended on the visually attractive as well as practical nature of its product. It seemed for so long that although the new methods and tech~iq~es were having a radical effect on large scale mappIng It could hardly affect us, no matter how hard we tried to reason. Inevitably as hardware and software improved, the day when we might become involved crept closer until some of us were convinced it was at hand. The one element that seemed as far away as ever was the quality of output. When the benefits of data analysis, data structure and digitisation became clear it was apparent that the AA Cartographic Department had a very good case for production by means of computer aided techniques. After all we produced maps in a variety of scales of one area (Great Britain), updated regularly, and the subject of the maps at these various scales was the same, roads. Of course there are other features to portray but here also digitising could help.
1 citations
TL;DR: An assessment is made of the commercially available videodisc systems and technical aspects of their use and the design issues which must be considered before applying such technology to a mapping system are detailed.
Abstract: An assessment is made of the commercially available videodisc systems and technical aspects of their use are outlined. The design issues which must be considered before applying such technology to a mapping system are then detailed. These include the area of the map sheet for each frame, which map series to store, the hardware configuration used and updating of the system.
1 citations
TL;DR: The problems of graphic database interchange standards from across the CAD spectrum are examined: from microCAD to mainframe CAD, and some solutions to these problems are looked at.
Abstract: Computer-Aided-Design (CAD) is the emerging force to be reckoned with in the world of surveying and mapping. CAD provides the technology for mapmakers to integrate, at different degrees of sophistication, the many facets of map making into a linked information chain so that maps are easy to make, revise, view, understand and communicate. Implicit in the CAD concept is the recognition that maps, which represent the end products of the mapping cycle, are shared graphic databases to be used in other information cycles. The uses to which these graphic databases can be applied are only limited by the imagination of man. To harness the full power of CAD technology, standards for graphic interchange formats must be firmly established. This paper examines the problems of graphic database interchange standards from across the CAD spectrum: from microCAD to mainframe CAD, and looks at some solutions to these problems.