Proceedings of Symposium on Remote Sensing and Photo Interpretation: Proceedings of Symposium on Remote Sensing and Photo Interpretation

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Multivolume work

Persistent identifier:: 842147969

Title:: Proceedings of Symposium on Remote Sensing and Photo Interpretation

Sub title:: October 7 - 11, 1974, Banff, Alberta, Canada

Year of publication:: 1974

Place of publication:: Ottawa, Ontario

Publisher of the original:: Canadian Inst. of Surveying

Identifier (digital):: 842147969

Language:: German

Other Title:: Nebentitel: Proceedings : Symposium on Remote Sensing and Photo Interpretation

Corporations:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Adapter:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Founder of work:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Other corporate:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Document type:: Multivolume work

Volume

Persistent identifier:: 842148353

Title:: Proceedings of Symposium on Remote Sensing and Photo Interpretation

Sub title:: October 7 - 11, 1974, Banff, Alberta, Canada

Scope:: VII Seiten, Seiten 469 - 878

Year of publication:: 1974

Place of publication:: Ottawa, Ontario

Publisher of the original:: Canadian Inst. of Surveying

Identifier (digital):: 842148353

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: T 15 B 1306

Language:: German

Additional Notes:: Literaturangaben

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

Corporations:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Adapter:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Founder of work:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Other corporate:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

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:: Volume

Collection:: Earth sciences

Chapter

Title:: INTERPRETATION AND ANALYSIS CHAIRMEN. - M. A. FONTANEL - G. HILDEBRANDT

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: DIFFICULTIES IN DETERMINING MEANINGFUL SPECTRAL SIGNATURES OF FOREST TREE CANOPIES. J. Vlcek

Document type:: Multivolume work

Structure type:: Chapter

DIFFICULTIES IN DETERMINING MEANINGFUL SPECTRAL SIGNATURES OF FOREST TREE CANOPIES J. Vlcek Department of Civil Engineering and Faculty of Forestry, University of Toronto, Toronto, Ont. Canada ABSTRACT Determination of spectral reflectance curves (signatures) of forest tree canopies presents many difficult problems. Some of these are: need for elevated observation platforms, lack of suitable field spectroradiometric equipment, need to monitor incident irradiance, bidirectional character of re flectance phenomena, 3-dimensionality of forest crown canopy, biomass, topo graphical conditions of the terrain, site characteristics of the stand and others. This article describes an attempt to determine, in situ, spectral signatures of several tree species found in Gatineau Park and Larose Experimental Forest in the vicinity of Ottawa, Canada. The data was collected in August 1973. Special emphasis was placed on their replicability so that their statistical properties could be assessed. The results show a great difficulty in finding "clean" signatures that could be termed characteristic of the species measured. This is attributed to large statistical variation of the signatures and also to the fact that, toward the end of the growing season, the spectral differences among trees become less pronounced. OBJECTIVE OF STUDY The study was initiated and sponsored by the Forest Management Institute, Department of the Environment, Government of Canada. The objective of the study was determination of daylight reflectance spectra within approxi mate band of 0.4 to l.lym of several tree species grown in the forest in two localities near Ottawa. The trees measured were: white pine (Pinus strobus L.), red pine (Pinus resinosa Ait.), white spruce (Pices glauca Voss), sugar maple (Acer saccharum Marsh.) and trembling aspen (Populus tremuloides Michx.). The work began at the end of July and finished in the first week of September. Spectral reflectance in this study was defined by the ratio (%) spectral radiation reflected in the direction of the instrument incident spectral radiation of daylight (sun & sky) Spectral reflectance so defined differs from laboratory measured quantity in that it depends strongly on the direction of sun's irradiance and the direction in which the reflectance is observed. The bidirectional character of the reflectance can be specified by three angles: zenith angle of the sun

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