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:: 84214806X

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

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

Scope:: VII, 465 Seiten

Year of publication:: 1974

Place of publication:: Ottawa, Ontario

Publisher of the original:: Canadian Inst. of Surveying

Identifier (digital):: 84214806X

Illustration:: Illustration, Diagramme, Karten

Signature of the source:: T 15 B 1305

Language:: German

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:: VEGETATION DAMAGE CHAIRMAN. - A. REINHOLD

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: LARGE-SCALE 70 MM COLOUR PHOTOGRAPHY AS AN AID TO DETECTING JARRAH DIEBACK. F. J. Bradshaw

Document type:: Multivolume work

Structure type:: Chapter

442 obvious areas of infection. However the early stages of ui the disease, where some of the understorey only are dying, s< cannot be detected on these photographs. tl Pi The same method of interpretation was first c< attempted in the southern forest in 1966 but with little success. The main reason for this appeared to be that fewer of the understorey species were susceptible, coupled with a higher proportion of marri in the overstorey. The death of the susceptible component of the stand therefore Ac had much less effect on the surface reflectance. Further, although the disease was spreading rapidly at that time, very little of it was at an advanced stage. It is worth fc noting here that while decadent jarrah crowns could be me detected on these photos, this factor alone was of little (2 value as an indicator of .dieback in many areas in the south. he Most crowns in the area were secondary crowns with a number tl of dead leaders as a result of past wildfires. Unless the cc disease was well advanced, symptoms in the understorey were me the only real guide even for ground reconnaissance, 01 le Attempts to detect diseased areas with colour and a] colour infra-red photos at conventional scales were also ui unsuccessful• It was concluded that a system of dieback mapping gi based on the detection of disease symptoms in individuals wj of the understorey offered greatest promise of success. te Limited trials by the author in 1968 and 1969 with large- Bi scale 70 mm photography were encouraging and established the f] basis for the project described in this paper. The early ac trials indicated that: tl 1S (i) Colour was superior to colour infra-red for A detecting dying understorey. (ii) A scale of about 1: 3,000 was necessary to detect o\ and identify dying banksia, zamia and blackboy. To differ- Ai entiate between healthy and dying blackboy it is necessary ue to differentiate between the colour of the central 15-20cm ce of blackboy crown and its outer fringe. cl (iii) Transparencies were superior to prints because of the improved resolution which permitted greater effective ar magnification of the image. Live zamias and sometimes ra blackboys are difficult to see on prints of this scale but are more readily seen on transparencies. (The presence of live susceptible species is an important diagnostic property) 1: 1: (iv) Photographs taken under cloud were superior to re those taken under a clear sky because the flat illumination na eliminated shadows which obscured a high proportion of the op understorey and also eliminated bright reflections from. shiny flat leaves which hampers colour differentiation. Ir The cost of complete coverage with large-scale photographs was prohibitive so that a two-stage program 2x

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