Remote sensing for resources development and environmental management: Remote sensing for resources development and environmental management

Damen, M. C. J.

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Multivolume work

Persistent identifier:: 856342815

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856342815

Language:: English

Additional Notes:: Volume 1-3 erschienen von 1986-1988

Editor:: Damen, M. C. J.

Document type:: Multivolume work

Volume

Persistent identifier:: 856343064

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Scope:: XV, 547 Seiten

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856343064

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(26,7,1)

Language:: English

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

Editor:: Damen, M. C. J.

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:: 3 Spectral signatures of objects. Chairman: G. Guyot, Liaison: N. J. J. Bunnik

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: CAESAR: CCD Airborne Experimental Scanner for Applications in Remote Sensing. N. J. J. Bunnik & H. Pouwels, C. Smorenburg & A. L. G. van Valkenburg

Document type:: Multivolume work

Structure type:: Chapter

S утро. Fig. 4 CAESAR sensor system. Fig. 5 CAESAR raw image acquired during the third test flight, April 23, 1985. Area :•Ouderkerk a/d Amstel, Netherlands Channels : 520, 685 and 785 nm Height : 2000 ft Pixels : 0.15 x 0.50 m tions of cable shieldings have been carried out prior to the final acceptance tests. RADIOMETRIC CALIBRATION AND PREPROCESSING Relative radiometric calibration is required for quantitative comparison of data corresponding with a single multispectral image and with temporal series of multispectral images. In case of absolute radiometric calibration, the transfer function is known between the spectral radiance at the entrance pupil of the instrument and the measured detector signal. Within the accuracy limits which can be achieved, an absolutely calibrated scanner can be used for multispectral radiance measurements. Abso lute calibration is only required if the user wants to apply radiometric corrections by means of exter nal data (from other instruments or models) and for the retrieval of object parameters from physically defined radiance values. The CAESAR system has been calibrated relatively and absolutely. For a calibration of the sensor part, a dedicated facility has been built. For each detector element and each spectral band the response function is measured, including the measurement of the darkcurrent. By means of a calibrated detector the radiance at the entrance pupil of the CAESAR modules is determined, providing input data for the absolute calibration. The same calibration facility has been used for geometric calibration. Test targets have been applied. An equally important part of the radio- metric calibration is the determination of the transfer functions for all channels between the analog input signal and the resulting digital words after analog to digital conversion. By the NLR for this purpose an electrical calibration facility has been designed and built. During the data preprocessing system corrections are applied for the removal of radiometric and geo metric errors. Aircraft velocity and attitude data are measured by an inertial navigation platform during flight. These data, together with position data are registered together with CAESAR sensor data and synchronisation data provided by an inter nal clock. After data conversion from high density tape to computer compatible tape, selected CAESAR data are preprocessed on a mainframe computer. All radio- metric calibration data stored in look-up tables are applied to radiometric correction of each single pixel value. Geometric correction software developed earlier for preprocessing of airborne side-looking radar data, has been modified in order to comply with the different scanning geometry of the down- and forward-looking channels of CAESAR. Geometric distortion are to a large extent removed by means of algorithms based on a motion model using flight altitude and navigation platform data. After the required image resampling data from different spectral channels and different dates of overflight can be registered. Precision registra tion of images acquired over land can be performed as a next step by means of ground control points. In such a way CAESAR data can be used as overlays for existing map projections. CONCLUDING REMARKS During 1986 a performance demonstration programme will be executed in The Netherlands in close co operation with users. The aim of this programme is a first validation of the capabilities of CAESAR for land and water observation. It will be investi gated for which applications high resolution CAESAR data can be used in combination with available high resolution satellite data in a multistage approach. LAN] Sherry C Depártame ABSTRACT: in the vii analysts : for agrici 1985. The combinatic criterion them accor images we] to verify the maxirm. bands. Clc time consi analyses, were decic RÉSUMÉ: Le le MSS. Ce Pour teste carré de ] principale combinaisc de l'entre bandes sel visualle c bandes pot Ensuite, c pour 3,4 o résultats : de la prot combinaisc 1. INTRODU Since 1982 (TM) , was (LANDSAT) System (MS seven bett three band infrared ( one from t reflected into 8 bit resolution 80m resolu sensor has and radian consequent larger dat design was considerin' of vegetat et al. 198' improve cri accuracy L strip fiel< problem en< to decide ] efficient!;

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