In 1989, the Council of the Photogrammetric Society decided that some record of the use of analogue photogrammetric equipment in Great Britain should be preserved before it was too late. The author agreed to investigate this matter as a research project funded by a number of survey organisations. Work on the project so far has resulted in the completion of two documents. The first is a Catalogue of Analogue Instruments that list some 230 instruments of 30 different types. The second is an Archive that gives further details of the history and use of the 30 different types of instrument. The entry included in his paper, by way of example, is that concerned with the Zeiss Stereoplanigraph.
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Much important archaeological information which is invisible to observers on the ground may be recorded on oblique aerial photographs, often taken with non‐metric cameras. There is a requirement to plot this information on existing topographic maps. The archaeological background is outlined and a digital single photograph mapping system, based on monocomparator, microcomputer and small flatbed plotter, is described. This system is inexpensive and can be used by archaeological personnel without expertise in either analytical photogrammetry or computer graphics. Hence it may be capable of a useful role in map revision; its potential for this purpose is discussed and refinements to overcome its limitations are proposed.
Résumé
Une grande partie des informations archéologiques importantes qui restent invisibles à des observateurs sur le terrain, peut être saisie avec des photographies aériennes obliques, prises le plus souvent avec des chambres non‐métriques. Il est nécessaire de reporter ces informations sur les cartes topographiques existantes. Pour cela on dessine le fond archéologique sur le cliché et l'on utilise un système de cartographie numérique basé sur l'emploi d'une seule photographie, et comprenant un monocomparateur, un micro‐ordinateur et une petite table traçante à plat. Ce système est bon marché et peut être mis en oeuvre par du personnel archéologue n'ayant aucune compétence en photogrammétrie analytique ni dans les sorties graphiques d'ordinateur. Ce système peut jouer, à partir de là, un rôle utile dans la révision des cartes; ses possibilityés dans ce domaine font l'objet d'une discussion tandis que des améliorations destinées à dépasser ses limitations actuelles sont proposées.
Zusammenfassung
Viele wichtige archäologische Informationen, die dem Betrachter im Gelände verborgen bleiben, können auf Schrägluftbildern, die oft mit Amateurkameras aufgenommen wurden, erkannt werden. Dazu besteht dann die Anforderung, solche Informationen auf vorhandene Karten zu übertragen. Der archäologische Hintergrund wird skizziert und für Einzelbilder ein digitales Auswerteverfahren beschrieben, das auf der Verwendung eines Monokomparators, eines Mikrorechners und eines kleinen Flachbettplotters beruht. Dieses System ist billig und kann durch Archäologen ohne jede Erfahrung in analytischer Photogrammetrie oder Digitalgraphik angewendet werden. Es kann auch sinnvoll für die Karlenergänzung sein. Seine Möglichkeiten dafür werden diskutiert und weitere Verbesserungen vorgeschlagen.
With the wider use of small format cameras for photogrammetric purposes and the requirement of companies to maintain a high level of quality assurance, there has been an increasing demand for the calibration and re-calibration of metric, semimetric and non-metric cameras. University College London has developed a technique for calibrating a range of small format cameras and this paper details the methods used and summarises the results obtained.
This paper was the first to be presented at the Thompson Symposium 1984 which had as its theme “The future of photogrammetry”. The paper considers only the acquisition of imagery for large scale mapping and similar purposes. It discusses the role of the standard metric aerial survey camera and makes some proposals for the wider use of smaller format cameras. It also reviews the position with regard to other possible sources of imagery such as vidicon and solid state cameras.
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