Actes du Symposium International de la Commission VII de la Société Internationale de Photogrammétrie et Télédétection: Actes du Symposium International de la Commission VII de la Société Internationale de Photogrammétrie et Télédétection

Laidet, L.

Actes du Symposium International de la Commission VII de la Société Internationale de Photogrammétrie et Télédétection (Volume 2)

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Persistent identifier:: 1669258823

Title:: Actes du Symposium International de la Commission VII de la Société Internationale de Photogrammétrie et Télédétection

Sub title:: Toulouse, 13 - 17 Septembre 1982

Year of publication:: 1982

Place of publication:: Toulouse

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1669258823

Language:: English

Editor:: Laidet, L.

Corporations:: International Society for Photogrammetry and Remote Sensing, Commission VII, Interpretation of Data

Adapter:: International Society for Photogrammetry and Remote Sensing, Commission VII, Interpretation of Data

Founder of work:: International Society for Photogrammetry and Remote Sensing, Commission VII, Interpretation of Data

Other corporate:: International Society for Photogrammetry and Remote Sensing, Commission VII, Interpretation of Data

Document type:: Multivolume work

Volume

Persistent identifier:: 1669259897

Title:: Actes du Symposium International de la Commission VII de la Société Internationale de Photogrammétrie et Télédétection

Scope:: XV, 415 Seiten

Year of publication:: 1982

Place of publication:: Toulouse

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1669259897

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(24,7,2)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist ermittelt.

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

Editor:: Laidet, L.

Corporations:: International Society for Photogrammetry and Remote Sensing,, Commission VII, Interpretation of Data

Adapter:: International Society for Photogrammetry and Remote Sensing,, Commission VII, Interpretation of Data

Founder of work:: International Society for Photogrammetry and Remote Sensing,, Commission VII, Interpretation of Data

Other corporate:: International Society for Photogrammetry and Remote Sensing,, Commission VII, Interpretation of Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: WG VII-1 METHODOLOGIE POUR L'AMELIORATION ET LA CLASSIFICATION THEMATIQUE DES DONNEES VISIBLES ET INFRAROUGE. - METHODOLOGY FOR ENHANCEMENT AND THEMATIC CLASSIFICATION OF VISIBLE AND INFRARED DATA.

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: [SESSION 1 1.6.] THE EFFECT OF DATA REDUCTION ON IMAGE INTERPRETATION by N A McEVOY and M H B THOMAS [...]

Document type:: Multivolume work

Structure type:: Chapter

data acquired 1 the ground required in der to Lon techni- _ number of . Monitor (OCM) 5 now planned 1 is known as 1985 ; McEvoy je data, tans gorm are 4 16. The ically commonly npressLon If the data. n hatios o$ btain this med data. This ed and we value of 255 ^. system nite . 25 fo T. 54545 Of h a Linear d to be to calculate Lc effects. o any high ning some t is unlikely wn to better By comparison, the error due to compression and reconstruction is comapa- tively small and can be regarded as an acceptable price to be paid for the Amprovement in coverage. 4 DETERMINATION We have used a simple power Law expression to determine chlorophyll concentrations. This is an algorithm which is widely used amongst experimenters. Explicitly, the chlorophyll concentration, C, is gtven by : 53 de «(Y where L, , L ze atmospherically corrected radiances in CICS bands 1 and 3 a , b = adjustable constants. ? The constants a and b are nonmally determined by Least-squares fitting to sea-thuth measurements and their values can vary considerably. Data compression causes errors in L, and Lg, which then cause errors in the value of C. Theory shows that the percentage error in C is directly proportional to ithe percentage evons in Ly and Lg and to the value of b but {independent of a. In our experiments, we have used values of b ranging from -2 up to -8.286, which represents the range used by experimen- ters. Errors in the chlorophyll concentration were found to be almost directly proportional to b as predicted by theory. Using b=-§.286 (the worst case) errors were found to be 22%ams. This figure should be compared with the errors in chlorophyll concentration due to the other system errors (see section 3). In particular a 2% error in the atmospheric correction will Lead to an error in C of approximately 60%, for b=-8.286. We should also consider the errors which are found in surface measu- nements. Because of the variation in concentration from point to point, a surface measurement may be quite unrepresentative of the average concentra- tion within a CICS pixel (800m square). Errors from this source can be up to 50% (Charlton, 1979). 5 COVERAGE IMPROVEMENT We have considered a satellite carrying an instrument package similar £o ERS-1, namely : ‘ OCM - 2.8 Mbit/s SAR (wave mode) - 600 kbits/4 Mtimeter - 10 kbits/4 Wind 4cattermeter - 1 kbit/s

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