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

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Synthetic geological map obtained by remote sensing An application to Palawan Island. F. Bénard & C. Muller

Document type:: Multivolume work

Structure type:: Chapter

Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 Synthetic geological map obtained by remote sensing An application to Palawan Island F.Bénard & C.Muller Institut Français du Pétrole, Rueil-Malmaison, France ABSTRACT: This project was undertaken to compensate for the lack of new data for the blanks of maps and to link spot datings due to bad outcrops on Palawan Island. A synthetic map of all the available data, including new field work and datings, is based on remote-sensed documents. Good results were obtained using black-and-white prints of Landsat MSS (band 7). Faults N60E on the E. coast show a recent normal movement, and the sinistral movement of the meridian zones is confirmed by field work. The geological units shown on the preexisting maps are identified and separated into subunits characterized on remote-sensed documents by their morphology - texture - tone properties. These subunits are superimposed on the geological units. This map suggests new hypotheses for further investigations on both the tectonic and lithological aspects. RESUME : Cette étude a été entreprise pour pallier le manque de données récentes, les lacunes des cartes et pour uniformiser les datations rendues ponctuelles par les difficultés d'affleurement de l'Ile de Palawan. Une carte synthétique, s'appuyant sur les données de télédétection homogénéise les données préexistantes et inclue les résultats de travaux de terrain récents accompagnés de nouvelles datations. Des images noir et blanc de Landsat MSS (bande 7). L'interprétation, visuelle sur agrandissements au 1/500 000 s'appuie essentiellement sur la morphologie. Deux directions majeures ressortent : l'une à N60 avec un mouvement normal récent sur la côte Est ; l'autre méridienne de jeu senestre récent confirmé sur le terrain. Pour chaque unité lithologique cartographiée, des figurés représentent les zones caractérisées, sur images, par leur homogénéité en morphologie, texture, teinte, reflet de variations lithologiques. Cette carte récente suggère de nouvelles hypothèses pour les études ultérieures tant eh tectonique qu'en lithologie. INTRODUCTION This study is part of the "Geodynamics of SE Asia" program undertaken several years ago by the Institut Français du Pétrole. The aim of remote-sensing interpretation is to obtain more geological and structural information by using this method in regions covered by dense vegetation, difficult of access to the field, and to supplement field observations which have been more or less restricted to coastal regions. Revised age determinations of sedimentary sequences are based on investigations of calcareous nannoplankton. Palawan (Fig. 1) is a narrow elongated SW-NE trending island (about 470 km long) which is part of the Philippines Archipelago. It is bounded to the north by the South China Sea and to the south by the Sulu Sea. The island is predominately mountainous reaching its greatest altitude at 1953 m (Cleopatra Needle). The slopes of the mountain ranges are narrow and steeper to the NW, reflecting the asymmetry related to NW vergent overthrusts. Located in an equatorial zone, it is covered by dense vegetation and rocks undergo strong alteration. MSS data are the only remotely-sensed information available for Palawan island. It can be shown that good results are obtained with careful physiographic studies. The geological map is a synthesis of remote-sensing interpretation combined with previous data from the literature mainly L. Fricaud, 1984 and field survey, J. Letouzey, 1985. This island is covered by three Landsat images (number 125-52, 125-53, 126-54). Sets from different dates were used (see references). Due to cloudy and hazy conditions, only band 7 gave useful information. Swath number 29 (center 10'36 lat, 119°42 long) taken by the synthetic aperture radar on board the SIRA shuttle was also studied. It covers a narrow transect of the island south of Mount Capoas. 1 METHODOLOGY All geological and structural information was reported on transparent overlays placed on black and white prints. The same method can be applied to MSS and radar images, even if the elements detected are different in each case (Floyd and Sabins, 1983). Particular attention was paid to physiographic elements. Exemples given in Fig. 2 demonstrate how this kind of information extracted from satellite imagery can be interpreted in terms of geology. Results are compiled on a 1:500 000 scale map with Lambert Conformal Conic Projection (0NC number L 11). To minimize difficulties related to dense vegetation in these tropical areas, attempts have been made to recognize "photofacies" representing a homogenous area on remotely sensed documents. It is characterized by specific criteria such as elevation, drainage pattern, landforms, texture, tone, etc. These characteristics are the results of interaction between lithology, tectonics, elevation and vegetation. On a first map all photofacies recognized were represented. Some of their characteristics may provide information on the lithology (hard or soft, bedded, heterogeneous, etc.). By comparing this document with other available geological data from the literature and field work, it was possible to compile the synthetic geological map on which the main sample locations are also shown. Accurate geological boundaries can be drawn if there is a possible correlation between the "photofacies" detected and a geological unit having a known lithology. This comparison with given data is important for interpreting the photofacies characteristics (hardness, structural fabrics). If two formations are different in age but similar in lithology, they have a same "photofacies". In this case, formation boundaries from previous maps are shown as dotted lines. However, such problems can be solved only by detailed field work.

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