The role of digital components in photogrammetric instrumentations

Bibliographic data

Monograph

Persistent identifier:: 830281363

Title:: The role of digital components in photogrammetric instrumentations

Sub title:: symposium of Torino, Italy ; 2nd - 4th October 1974

Scope:: ca. 200 Seiten in getrennter Zählung

Year of publication:: 1974

Place of publication:: Torino, Italy

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 830281363

Illustration:: Illustrationen, Diagramme

Signature of the source:: T 15 B 1280

Language:: English

Additional Notes:: Literaturangaben

Other Title:: Nebentitel: Digital components in photogrammetric devices

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Corporations:: International Society for Photogrammetry, Commission, 2

Adapter:: International Society for Photogrammetry, Commission, 2

Founder of work:: International Society for Photogrammetry, Commission, 2

Other corporate:: International Society for Photogrammetry, Commission, 2

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2015

Document type:: Monograph

Collection:: Earth sciences

Chapter

Title:: TRENDS IN DESIGN OF DIGITAL EQUIPMENT FOR PHOTOGRAMMETRIC INSTRUMENTS. U. V. Helava

Document type:: Monograph

Structure type:: Chapter

3 follow each other at two to three year intervals. This contrasts drasti cally with the traditional ten to twenty year cycle of photogrammetric equipment. The objective of this paper is to identify trends in the design of digital components for ph<>;ogrammetric equipment, and to show where such trends may lead when extended on the basis of developments in digital technology. In discussing the trends in the design of digital equipment for photogrammetric instruments, it is not practical, nor necessary to attempt to cover its entire scope. Some illustrative examples, such as coordinate recorders, servos, and analytical plotters give clear indications about the trends and their extensions on the basis of developments in general digital design. These examples will be discussed later in this paper. However, before that we must digress a little and have a look at digital design trends in the wide world outside photogrammetry. TRENDS IN DETAIL DESIGN Detail design of digital electronic devices, including those likely to find use as components of photogrammetric instruments and systems, has an overwhelming trend toward integration. The technology has evolved very rapidly from the discrete component level to medium scale integra tion (MSI) and from there to large scale integration (LSI). Lately, concepts like giant scale integration (GSI) and very large scale inte gration (VLSI) have appeared in the literature. Another way to describe this evolution is to say that the device complexity has progressed from a few active elements (such as transistors) per device to. thousands of elements (LSI) and is on its way toward hundreds of thousands of elements per device. Associated with increasing device complexity is a dramatic reduction in the cost of active and passive elements. Decreasing cost of elements leads to a parallel reduction of cost per function. Thus, the cost of equivalent computer power, as an example, has decreased, and keeps de creasing by one half approximately every two years. Similar reductions in the cost of digital functions performed digitally are observable throughout the industry, but are more difficult to quantify because there is no stable comparison base. The integration trend poses problems for the designer. First the technology is very complex and specialized. Very expensive manufacturing facilities are needed, and the realization of designs requires that numer ous rules and constraints be meticulously followed. Second, full cost advantages accrue only when the device is manufactured in very large quantities. When only a few devices of special design are produced, the cost per device is very expensive indeed. The design responsibility has been shifting to the semiconductor manufacturer, who designs and produces functionally defined devices, expected to find wide acceptance and use

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