Proceedings of the Symposium on Global and Environmental Monitoring: Proceedings of the Symposium on Global and Environmental Monitoring

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Persistent identifier:: 856665355

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts ; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856665355

Language:: English

Document type:: Multivolume work

Volume

Persistent identifier:: 856669164

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Scope:: XIV, 912 Seiten

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856669164

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: ZS 312(28,7,1)

Language:: English

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

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [THP-5 IMAGE INTERPRETATION AND ANALYSIS]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: A MORE DISCRIMINATING USE OF AERIAL PHOTOGRAPHIC EMULSIONS AND PROCESSING TECHNIQUES. Livio Fent

Document type:: Multivolume work

Structure type:: Chapter

A MORE DISCRIMINATING USE OF AERIAL PHOTOGRAPHIC EMULSIONS AND PROCESSING TECHNIQUES Livio Fent Photographic Science Alberta Forestry, Lands and Wildlife Resource Information Branch Edmonton, Alberta, Canada ISPRS Commission VII ABSTRACT Aerial photographic emulsions have generally been classed into four broad classes: true color, color infrared, black and white panchromatic, and black and white infrared. A number of recent developments have expanded the film use spectrum so that users can now be more exacting and specific in their applications. The introduction of panchromatic-infrared films, a negative process for color infrared film, a greater diversity of color films, plus a greater awareness of average gradient-gamma manipulation have all contributed to a more discriminating user approach in aerial photography. A review of the benefits and applications of these technologies and techniques is undertaken. INTRODUCTION The past five to eight years have seen significant advancements made in the field of photographic emulsion technology. The introduction of tabular, core shell, so called "twin crystal" grains, and the application of DIR (developer inhibiting releasing) couplers have produced emulsions with improved granularity, resolution, and color saturation characteristics [1- 4]. Aerial photography has also had its share of improvements in emulsion technology, partly as a result of the general improvements in the amateur- professional markets, and partly due to specific requirements in the process of vertical imaging. The effects of these changes has been two fold: one, end users of the imagery have become more aware and demanding of products which suit their needs, two, acquisition firms have had to adapt to the proliferation of these new products and also to the more critical demands of their clients. Although the situation has generally been advantageous to both the production and user sectors, some confusion has inevitably arisen regarding the appropriate application of the various film types. The four spectral class types of aerial films have traditionally been black and white panchromatic, black and white infrared, true color negative and positive, and false color infrared. These classes are still valid in the general sense, however, the profusion of newer films and more controlled processing techniques have introduced 759

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