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:: 4 Renewable resources in rural areas: Vegetation, forestry, agriculture, soil survey, land and water use. Chairman: J. Besenicar, Liaisons: M. Molenaar, Th. A. de Boer

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Application of multispectral scanning remote sensing in agricultural water management problems. G. J. A. Nieuwenhuis, J. M. M. Bouwmans

Document type:: Multivolume work

Structure type:: Chapter

489 Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 Application of multispectral scanning remote sensing in agricultural water management problems G.J.A.Nieuwenhuis Institute for Land and Water Management Research (ICW), Wageningen, Netherlands J.M.M.Bouwmans Government Service for Land and Water Use (LD), Utrecht, Netherlands ABSTRACT: A method has been developed for the automatical mapping of évapotranspiration from digitally taken reflection and thermal images. This method has been tested in combination with field measurements and agro- hydrological model calculations. We found that an important improvement of the hydrological description of an area can be achieved by combining the remote sensing approach with conventional methods. Especially the spatial variation in soil physical characteristics can be determined more accurately by applying remote sensing techniques. Satellite and airplane images acquired after a dry period supply information about the occurrence of drought damage. Because of the fast changing weather conditions in humid areas like the Netherlands remote sensing in water management will mainly depend on scanning techniques from airplanes. 1 INTRODUCTION Remote sensing techniques can be applied to obtain information about the hydrological characteristics of an area. In a remote sensing study project per formed in the eastern part of the Netherlands (East Gelderland) we developed a method to automatically derive an évapotranspiration map from reflection and thermal infrared multispectral scanning images. In formation about regional évapotranspiration of crops is important for optimal water management in agri culture and for the determination of the effect of man-made changes in the overall hydrological situa tion. In the framework of the mentioned study project experience is obtained especially with the detection of drought damage. From an economical point of view prevention of damage caused by excess of water is also important in the Netherlands. Untili now only Figure 1. Location of the three study areas in the Netherlands limited experience has been obtained with remote sensing like MSS techniques and radar. Probably remote sensing images taken directly after the winter period can supply information about the regional distribution of areas with water excess. At the beginning of the growth stage information about excess of water might be obtained through differences in germination. We are currently testing the usefulness of remote sensing to solve water management problems. In several projects we are investigating whether the additional use of remote sensing is technically and financially advantageous in determining the effects of hydrolog ical measures. In this paper we give an overview of the MSS re search. The concerning study areas are indicated in Figure 1. 2 THEORY AND METHODS 2.1 Relation between instantaneous crop temperature and 24 hour évapotranspiration rate For the translation of instantaneous to daily values the TERGRA-model has been developed (Soer 1977). In terpretation of thermal images with the aid of the TERGRA-model is rather complicated, however, because of the large number of input parameters that are re quired. For an operational use of remote sensing techniques simplified procedures are of importance. For this aim Jackson et al. (1977) related midday surface-air temperature differences linearly to 24 hour évapotranspiration and net radiation values. To estimate the slope of this relationship a crop depen dent analytical expression has been derived by Seguin and Itier (1983). With the approach of Jackson absolute estimates of crop évapotranspiration are obtained. As heat images are mainly applied to determine reductions in évapo transpiration this approach has been adjusted (Nieuwenhuis et al. 1985). The surface air temperature difference in the ap proach of Jackson has been replaced by the temperature difference that exists between the crop that is transpiring under the actual restriction of the soil moisture condition and that transpiring under optimal soil moisture conditions (T C ~T*). The net radiation term was replaced by the 24 hour potential évapotrans piration rate of the crop. With this adjustment they obtained:

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