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

Bibliographic data

Multivolume work

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:: [TP-2 SPECTRAL SIGNATURES]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: The change of spectral signatures of beech and spruce by forest damage. W. Kirchhof & H. Hoffmann

Document type:: Multivolume work

Structure type:: Chapter

In the NIR strong influence of biomass or number of branches piled up of the same species on reflectance was confirmed. Saturation was reached for 5-7 branches. The measurement results of tree components of damaged beech and spruce trees emphasize the importance of the IR-region for damage classification. The spectral reflectance of beech branches decreases with increasing damage level. The reflectance curves of spruce branches show also in the IR a more consistent course. In the NIR the plateau level reduces with increasing degree of damage, yellowing is of minor importance. For wavelengths greater than 1,4 pm the curves for spruce branches raise with increasing degree of damage. This may be explained by augmented water stress, because also at the NIR- plateau attenuation in the water absorption bands reduces with increasing damage level. The spectral behaviour of the reflectance curves for beech and spruce in the visible region is largely influenced by discolouration, which seems not necessarely to be an indicator of damage. As already mentioned by Kenneweg, 1989, recent experience with damage interpretation indicates the important role of structural elements of tree crowns rather than colour. The interpretation of the curves in figure 6 and 8 for the visible as source of information on damage is difficult and may be misleading. For data evaluation additional statements on discolouration and its regional variation in respect to the degree of damage should be available. Caused by discolouration a red shift of the reflexion peak in the visible of about 10 nm and a variation of shape at the beginning of the slope to the NIR plateau was observed. These phenomena have to be further investigated, also with respect to their detection by future spectral high resolution instruments and their application in classification of forest species and forest decline. The results proved the influence of primary effects of damaged trees by measurement of tree components of beech and spruce. Secondary effects are mainly produced by crown struc ture change, increase of shadow areas and radiation from the background. Background radiation will be in fluenced by the degree of damage resulting in morphological and structural changes of the tree and its components. Higher amounts of sun and sky radiation will then penetrate to the undercover or the ground and will be reflected. It adds to the reflectance signal of the tree. As a consequence spectral reflectance of developing background or undercover vegetation may become an important factor for higher degrees of damage, as reported by Koch, 1987, and Herrmann, 1988, for beech undercover of severely damaged pines. References Anonymuons 1987, Waldschaeden in der Bundes republik Deutschland, Schriften BM Ernährung, Landwirtschaft, Forsten, A., Heft 349 Collins, W; Chang, S.H.; Raines, G; Canney F.; Ashley, R. 1983, Airborne Biogeophysical Mapping of Hidden Mineral Deposits, Econ. Geol., 78: 737-749 Guttmann, S.; Kirchhof, W.; Lamberty, M.; Roth, Th.; Schramm, M.; Zwenger, I.; 1987, Multispektrale Auswertung und Klassifikation von Flugzeug-Scanner-Daten im Untersuchungs gebiet Frankfurter Stadtwald, In: 2. DLR Statusseminar, Oberpfaffenhofen, 26-52 Hermann, K.; Rock, B.N.; Ammer, U.; Paley, H. N. 1988, Preliminary assessment of airborne imaging spectrometer and Thematic Mapper data acquired for forest decline areas in the Federal Requblic of Germany. Remote Sensing of the Environment 24, 129-149 Hildebrandt, G. 1976. Die spektralen Refle xionseigenschaften der Vegetation, Proc. XVI IUFR0 World, Oslo Hoffmann,H.; Kirchhof, W. 1989a, Verglei chende reflexionsspektroskopische Vegeta tionsmessungen im Labor und Gelände an Rot buchen und Fichtenzweigen, Teil 1: Ver suchsaufbau, Labormessungen, Modellierung, DLR-JB 552-08/89, 50 S., Oberpfaffenhofen Hoffmann,H.; Kirchhof, W. 1989b, Verglei chende reflexionsspektroskopische Vegeta tionsmessungen im Labor und Gelände an Rotbuchen und Fichtenzweigen, Teil 2: Geländemessungen, Vergleich mit Labordaten. Eignungstests verfügbarer Spektralbänder, DLR-JB 552-09/89, 56 S., Oberpfaffenhofen Hoque, E.; Hutzier, P.J.S.; Hiendl, H. 1990, Studies on reflective features of norway spruce and their possible applications in remote sensing of forest damage. Toxicological and Environmental Chemistry, Vol. 27, P. 209-215 Johnson, P.L. 1969, Remote Sensing in Ecology, Univ. Georgia, Athens Kenneweg, H. 1989, Remote sensing approaches to assessment and diagnosis of forest decline, in: Air pollution and forest decline, eds. Bucher I.B., Bucher-Wallin, I. , Birmensdorf, p. 217-221 Kirchhof, W.; Guttmann, S.; Schramm, M.; Zwenger, I.; Lamberty, M. 1988, Spectral characterisation of forest damage in beech, oak and pine stands, ESA SP-284, p. 623-624 Kirchhof, W.; Mauser, W.; Stibig, H.J. 1986, Investigation of the information content of Landsat Thermatic Mapper and SPOT multiband image data using simulated multispectral 55

Access restriction

Copyright

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

Multivolume work

Volume

Chapter

Chapter

Table of contents

Cite and reuse

Volume

Chapter

Image

Image fragment

Citation links

Citation recommendation