ISSN:0143-1161    

DOI:10.1080/01431168708948630

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0143-1161    

DOI:10.1080/01431168708948632

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0143-1161    

DOI:10.1080/01431168708948633

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0143-1161    

DOI:10.1080/01431168708948634

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0143-1161    

DOI:10.1080/01431168708948635

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Supervised maximum likelihood classification was compared with a supervised binary decision tree for crop classification from multitemporal LANDSAT MSS data. Similar levels of classification accuracy were obtained using both algorithms, but the ease of training and computational simplicity of the binary decision tree suggest that this algorithm may be a viable alternative to the maximum likelihood for the analysis of data sets with high dimensionality such as multitemporal LANDSAT MSS data.

ISSN:0143-1161    

DOI:10.1080/01431168708948636

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Méthode d'introduction de centres initiaux pour l'algorithme d'agrégation autour de centres mobiles. Cette approche, fondée sur des his-togrammes de données, permet de fixer correctement les centres des classes initiates pour réaliser une classification sans connaissance a priori. La performance de la methode proposée a été étudiée à travers un example de classification multispectrale sur des données Thematic Mapper

ISSN:0143-1161    

DOI:10.1080/01431168708948637

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The imaging process of a sensor is affected by the motion of the target. The simple optical image undergoes blurring due to target motion, but the more complex aperture synthesis process of the Synthetic Aperture Radar (SAR) results in a shift in the position of the moving target. The different parts of an extended non-linear target (such as an ocean eddy) are differentially shifted in the image plane and this leads to a geometric distortion of the shape of the target. In this paper, we have attempted to analyse this distortion factor for the case of an ocean gyre and have tried to express it as a function of the velocity of the gyre. The relationship thus arrived at has been applied to the innermost ring of an Atlantic Ocean gyre image by Shuttle Imaging Radar A. The velocity values (speed and direction) are retrieved under the assumption that the target ocean ring is circular in nature. The method appears promising for deriving the velocity field of the ocean gyres through SAR observations from remote platforms. Simultaneous optical observations, if available, will allow the estimation of velocity for ocean gyres/eddies with arbitrary shapes, without the necessity of assuming circularity.

ISSN:0143-1161    

DOI:10.1080/01431168708948638

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Abstract. Digital image enhancement of selected LANDSAT Multispectral Scanner (MSS) image data for the coastal area of eastern Saudi Arabia reveals large sandbanks in relatively clear water, 8-10 m deep. LANDSAT MSS imagery of wave length range 0-5-0-6 μm was masked digitally to remove onshore spectral data and the contrast range of sea areas enhanced to display tonal variations which correspond in form to major barchanoid-shaped shoals on the sea floor. The shape, scale and orientation of the sandbanks suggest that they may be submerged aeolian dunes. If these sandbanks are submerged dunes, they predate the last eustatic sea level rise (8000-10000 years Bp) and must have been stabilized by cementation prior to submergence in order to survive palaeo-wind and current erosive action.

ISSN:0143-1161    

DOI:10.1080/01431168708948639

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor