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:: INTERPRETATION OF COLOUR-INFRARED PHOTOGRAPHS FOR THE ASSESSMENT OF FOREST DECLINE IN CENTRAL EUROPE. Claus-Peter Gross, Norbert Heidingsfeld

Document type:: Multivolume work

Structure type:: Chapter

characteristics visible instereoscopic view refer to the three dimensional appearence of a crown in aerial photographs. No matter what type of film or emulsion is being used, the shape of the crown is always visible. The characteristic shape types can easily be assessed. - The description of the shape includes (a) the form of crowns, (b) their coarse struc ture and (c) their fine structure. - The parameter "colour” is generally ana lysed according (a) colour distribution, (b.) saturation and brightness, (c) colour tone, the only factor still to be adepted to the conditions of the flight. - Discolouration symptoms (chlorosis) are de termined seperatly in four steps (Table 2). The combination of both kinds of symptoms results in the final classification of the crown condition, analogous to the system being used for terrestrial inventories (see section 1.1). - The description of the symptoms is supple mented by a photographic documentation of representative trees compiled both in field-work and aerial photography, as well as by a. graphic appendix. 3 CONCLUSION After three years of intensiv work the team Arbeitsgruppe Forstlicher Luftbildinterpreten has now interpretation keys to classify fo rest decline for four main tree species in Central Europe: spruce, beech, oak and pine /1/. A manual in five languages based on the se keys is now being developt with the spon sorship of the European Community - a fact underlining the high standard and progress of the work of the group. The application of this new type of interpre tation keys improves the standardization of evaluation methods and provides the basis for comparison between different inventories. To improve the quality of furture interpre tation results ist is recommended to stan dardize the quality of all aerial imagery surveys, to harmonise the applied interpreta tion keys and, most of all, to attune the in terpreters to the same criteria and to con trol their interpretation results /6/. Table 2. Interpretation Key for "Clorosis" as a supplementary characteristic for the classification of Norway Spruce Chlorosis Level %-Proportion of Canopy with Chlorosis Colour Characteristic in CIR-Aerial Photographs Change of (without Initial Level Chlorosis) general specific 0 1 2 3 0 < 10 no change of the colour characteris tics specific for damage levels 0 1 2 3 1 11 to 25 small areas of red-white or pink marblings 0 1 2 3 2 26 to 60 compact, large areas of pink or white 1 2 3 3 3 > 60 most of the crown or entire crown whitish 2 2 3 3 756

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fullscreen: Proceedings of the Symposium on Global and Environmental Monitoring (Part 1)

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