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

Damen, M. C. J.

Bibliographic data

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:: 2 Microwave data. Chairman: N. Lannelongue, Liaison: L. Krul

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Geological analysis of Seasat SAR and SIR-B data in Haiti. Ph. Rebillard, B. Mercier de l'Epinay

Document type:: Multivolume work

Structure type:: Chapter

157 Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 Geological analysis of Seasat SAR and SIR-B data in Haiti Ph.Rebillard SEP/DTI, Puteaux, France B.Mercier de l’Epinay Université PM. Curie, Paris, France ABSTRACT : Synthetic Aperture Radar data obtained by Seasat in 1978 and by SIR-B in 1984 were registered to the corresponding Landsat MSS data over the Western part of Haiti. Two areas were studied : the island of La Gonave and the Miragoane area. Seasat SAR data were registered to the Landsat data over the island of La Gonave and both Seasat and SIR-B data were compared over the Miragoane area. In both cases, difficulties occured in the interpretation due to the relief which distorted the radar data particularly the Seasat data for which the radar incidence angle was 20 degrees ; futhermore, on the Miragoane area difficulties occured using the SIR-B data due to low radar signal. Structural lines and lithological boundaries were pointed out thanks to the compositional and textual informations provided by the radar and MSS data. Geological interpretation maps of La Gonave and the Miragoane area were drawn : boundaries between rocks Eocene of age and rough basalts were precised as well as 1) domes, 2) ancients faults oriented NE-SW, 3) faults oriented NW-SE linked to the La Gonave anticline and 4) faults oriented E-W integrated in the tectonic model of the Caribbean plate. 1 INTRODUCTION The Western part of Hispaniola has been imaged by Seasat in 1978 and by SIR-B in 1984 (Fig. 1). Two areas were studied: the island of La Gonave and the Miragoane area (Southern branch of Haiti). Seasat SAR data were registered to the Landsat MSS data over the island of La Gonave and a map was produced showing the interest of compositional and roughness informations produced by MSS and Seasat respectively. Over the Miragoane area, both Seasat and SIR-B data were contrasted to the existing maps Seasat SAR acquired data at 20° incidence angle. In this case, surface slopes played a dominant role because of the quasi-specular scattering mechanism. Therefore topography is strongly highlighted in the Seasat images. The effect of foreshortening as well as foldover, in some cases, even make topography effects more dramatic. SIR-B data were acquired with an incidence angle of 60°. In this geometry, the scattering is mostly dominated by the surface roughness at the scale of the wavelength (L band = 25 cm). The roughness characteristics include both the soil roughness as well as the vegetation surficial and volumetric roughness. Surface slopes also impact the scattered return by modulating the scattering from the surface roughness. Surface dielectric constant also plays a role in the scattered intensity. Therefore combined Seasat/SIR-B data contain informations on surface topography as well as on roughness and provide a better knowledge of the surface physical properties. The following paper presents our preliminary results. 2 SPACEBORNE DATA Seasat SAR data were acquired on August 17, 1978 during rev. 737. The swath width was 100 Km and the incidence angle was 23.5°. The SIR-B data (data take KI-086.10) were obtained in October 1984. The SIR-B swath was 14.6 Km wide and the incidence angle was 60° (Ford et al. 1986). Both Seasat and SIR-B were operating in L-band and HH polarization. Coverage of the radar paths are indicated in Fig. 1. Landsat MSS data were obtained on June 29, 1979 (path 009, row 47). Bands 4, 5 and 7 were used during the study. Figure 1. SAR data coverage, 1: Seasat rev. 737, 2: SIR-B data take KI-086.10. 3 DATA REGISTRATION The registration of the Seasat and the Landsat MSS data over the La Gonave area has been made as a pixel to pixel registration using the SEP's Vizir Image Processing System procedures. The Landsat MSS data image was taken as the reference image. Fifty nine ground control points were chosen (Rebillard et al, 1983 ) . Several difficulties occured due to the relief of the island and as a consequence, the registration is not perfect in the center of the study area. In the Seasat images (acquired data at 20° incidence angle), surface slopes played a dominant role because of the quasi-specular scattering mechanism. Therefore topography is strongly highlighted and the effect of

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