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:: Multitemporal analysis of Thematic Mapper data for soil survey in Southern Tunisia. G. F. Epema

Document type:: Multivolume work

Structure type:: Chapter

245 Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 Multitemporal analysis of Thematic Mapper data for soil survey in Southern Tunisia G.F.Epema Department of soil science and geology, Laboratory for remote sensing, Agricultural University of Wageningen, Netherlands ABSTRACT: The possibilities of Thematic Mapper data for the examination of the dynamics of an area in Southern Tunisia are the subject of this study. A general view is given over the methods to compare Thematic Mapper data of different days. It was shown that different methods and products are complementary for interpretation. The most important changes were in salt content, vegetation and exposition. Recommendations and a start for further research in order to find more subtle changes and for a more quantitative approach havd been described. 1. INTRODUCTION The dynamics of an area may give problems in relating satellite or other remote sensing data to surface characteristics. At the other hand the dynamics of the surface are an important characteristic of the units in an area. Also in arid regions with a very sparse vegetation cover important permanent and non permanent changes of the surface may occur. In this paper the possibilities and constraints of multitemporal analysis of Thematic Mapper data for the study of the dynamics of an arid area in Southern Tunisia (near Kebili) are presented. An extensive description of the area and of the use of Thematic Mapper for mapping this area have been presented by Mulders and Epema (1986) and Epema (1986). Therefore only a very general description will be given. The study area has an arid climate and covers both the margin of a playa and footslopes. Cuesta ridges are present with in front of it the footslopes, which are partly covered with gypsum crust. Moreover dunes of different heights are present on the footslope and in the playa border zone. In this last zone also spring mounds are present. The playa and playa border zone are saline flats with a groundwater depth less than 1 meter. With the exception of the oases the cover with vegetation is small and in the playa even absent. For this area Thematic Mapper tapes were available for 29 January 1983 and 18 May 1985. These days represent the situation after respectively relatively dry and wet circumstances. Changes in multitemporal remote sensing data can be made visible with an interpretation of images of the different days. In order to make a valuable interpretation the type of image and limits of linear stretch must be appropriate. Therefore the spectral characteristics of the units have to be studied first. Then an overview is given of relevant possible differences between these two dates. These are due both to changes of the surface itself and to the effect of difference in sun elevation and turbidity of the atmosphere at Landsat overpass time. Different methods are compared in order to match the data in such a way that relevant changes in spectral reflectance can be read from the data. Then spatial differences in dynamics of reflectance will be shown. Thematic Mapper for 29 January 1983 and for 18 May 1985. The digital numbers on these tapes were converted to reflectance values at the top of the atmosphere. With the aid of tables presented by the NASA (Technical Memorandum 86149; 1984) and more recent reports, characteristics of Thematic Mapper of Landsat 4 and 5 on these two days for the channels (or bands) could be gathered. A procedure leads to linear transformation from digital numbers to reflectance values with only a small intercept. Feature space plots, correlations between spectral bands and principal components were studied in order to get insight in the spectral behaviour of the surface. The feature space plots in fig. 1 are useful to show the main spectral groups. 2. SPECTRAL CHARACTERISTICS Computer compatible tapes were available of Fig. 1. Plots of May reflectance at the top of the atmosphere for band 4 TM with bands 1, 3 and 7.

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