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

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Spectral signature of rice fields using Landsat-5 TM in the Mediterranean coast of Spain. S. Gandia, V. Caselles, A. Gilabert & J. Meliá

Document type:: Multivolume work

Structure type:: Chapter

Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 257 Spectral signature of rice fields using Landsat-5 TM in the Mediterranean coast of Spain S.Gandia, V.Caselles, A.Gilabert & J.Melia Department of Thermology, Faculty of Physics, University of Valencia, Spain ABSTRACT: This work gives the first results of a study carried out in an agricultural area of the Spanish Mediterranean coast using Thematic Mapper images. Three cover types, rice, citric - vegetable orchard and urban area are classified in the zone by using a vegetation index. Bands 4 and 5 seem to be more suitable for a possible classification of two varieties of rice. Key words: Thematic Mapper, vegetation index, rice plants. RESUME: Ce travail donne les premiers résultats d'une étude réalisé dans une zone agricole de la côte méditerranéenne espagnole en utilisant des images du Thematic Mapper. Trois types de couverture du sol (riz, agrumes-legumes et une zone urbaine) ont été classées. Les canaux 4 et 5 semblent les plus convénianu» pom une distinction de deux variétés de riz. Mots clés: Thematic Mapper, index de végétation, cultures rizières. 1. INTRODUCTION The application of radiometric measurements to the study of the spectral response of rice has originated a number of publications. A fair amount of the experimental measurements have been ground-based radiometric ones and have mainly addressed to establishing correlations among parameters of an agricultural interest such as production, influence of the use of different fertilizer treatments (Patel, 1985), (CCE.1978), (Berg, 1980), etc. Air - flight images as well as images carried out from satellites, especially with the Landsat MSS have also originated frequent works (CCE, 1984). The Thematic Mapper (TM) sensor of the Landsat 5 provides better achievements with respect to the MSS which gives it a greater potentiality in regards to thematic mapping techniques. In regions with high ground parcelation the increase of spatial resolution from 80 m (for the MSS) to 30 m (for the TM) is essential. In the same way, the inclusion of new spectral bands, B1 (0.45 - 0.52 pm), B5 (1.55 - 1.75 pm) and B7 (2.08 - 2.35 pm) allow a more complete definition of spectral signatures. The increased quantization level of 6 bits (0 - 63) to 8 bits (0 - 255) is very important in areas where besides high parcelation, different agricultural cultivations alternate with urban areas. D. L. Toll (Toll, 1985) carries out an important study comparing the different characteristics of TM and MSS sensors for land cover classification. The present work gives the first results of rice studies carried out in an area of the Spanish Mediterranean coast from measurements supplied by the satellite Landsat 5 (TM). 2. STUDY SITE DESCRIPTION AND DATA USED Approximately a third of Spanish rice production is obtained at the south of the city of Valencia (Spain) which is an area eminently agricultural. The area of cultivation (about 15.500 ha) expands along the lands bordering the lake "La Albufera" and the proximities of the outfall of the Jucar river, "Ribera Baixa". This is a high populated area where rice cultivations alternate with citrics and vegetables. The lands dedicated to the cultivation of rice are slowly but constantly decreasing because they are being substituted by orchards and citrics. The map of figure 1 shows the referred area and the two studied zones. But this seaboard stripe is also undergoing a strong urban pressure characteristic of tourist areas. Similarly La Albufera lake and its surroundings is an area of general interest due to the alterations produced in the natural environment. The heterogeneity of land cover types besides the big ground parcelation impose the use of satellite measurements with high spatial resolution for the classification of the ground. In this study two neighbouring zones of about 7 km 2 each have been chosen (figure 1). The lower one (Sueca) representative of the different land cover types: rice, citric - Figure 1. Training sites located in the Mediterranean coast of Spain. vegetable orchards and urban areas and has been defined in order to separate these three land cover classes. The upper zone (La Albufera) mainly contains rice fields. The work has been centered in this area in order to study the spectral response of rice. In both zones, reference parcels have been chosen, with the caracteristics shown in Table I. The varieties Bahia (91%) and Sequial (8%) cover almost exclusively the whole production.The net efficiency is about 6500 kg/ha. Parcels with other varieties (Rubino, Pierina and Lido) have been taken in order to study reflectivities. These latter parcels are considered experimental from a production point of view. The citric - vegetable class presents a great internal variability due to the different degree of vegetated cover of the ground. In these class other types of cultivations such as vegetables have been included in order to discriminate them from rice.

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