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  • Artikel  (12)
  • discriminant analysis  (7)
  • Monsoon  (5)
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  • 1
    Digitale Medien
    Digitale Medien
    Meridional transport of sensible heat in contrasting monsoon activity: Spherical harmonic analysis (1982)
    Springer
    Pure and applied geophysics 120 (1982), S. 229-248 
    Details
    ISSN: 1420-9136
    Schlagwort(e): Meridional transport ; Monsoon ; Sensible heat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract Spherical harmonic analysis is made of the grid point values of geopotential heights at 700 mb and 300 mb levels for the months April to August for the years 1967 and 1972. The year 1967 is a good monsoon year and 1972 is a bad monsoon year in India. Meridional transport of sensible heat is obtained in wave number domain using spherical harmonic coefficients at 500 mb level form=1 to 10 andn−m=0 to 10, wherem represents the wave number round the globe andn−m gives the numbers of zero points from north pole to south pole excluding the poles themselves. Large northward transports of sensible heat in the month of May and in the monsoon months at the subtropics are characteristic of bad monsoon. Wave 1 transports sensible heat southward (forn−m=0) and wave 2 transports sensible heat northward (forn−m=4). Strengthening of wave 1 is conducive to good monsoon year and strengthening of wave 2 is conducive to bad monsoon year. These are the same features obtained in Fourier analysis. The contrasting features exist in waves 1 and 2 both in good and in bad monsoon and are better defined in the present analysis than in the Fourier analysis of the earlier study. However, waves 1 and 2 reveal clearer contrast in the present analysis than in the Fourier analysis. Bad monsoon activity is associated with large divergence of heart at subtropics and large convergence of heat at extra tropics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00877034
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  • 2
    Digitale Medien
    Digitale Medien
    Results of the studies of monsoon circulation with radon as a tracer (1984)
    Springer
    Pure and applied geophysics 122 (1984), S. 124-132 
    Details
    ISSN: 1420-9136
    Schlagwort(e): Monsoon ; Radon ; MONEX ; Equator ; Arabian Sea ; Indian ocean ; Interhemispheric mixing
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract Radon-222 activity levels have been measured at deck level in regions of the Arabian Sea, Indian Ocean, and Bay of Bengal during the summer monsoon periods of 1973, 1977, and 1979, as part of the Monex programme. The aim of the measurements was to find the source regions of the monsoon air and the variations in its composition under different synoptic conditions. The radon data confirm that the monsoon air is predominantly of southern-hemisphere origin, with a small continental component. The continental component, as indicated by radon values, increases at higher latitudes and seems to vary with different circulation patterns in the synoptic scale. The use of radon as a tracer in monsoon studies is thus demonstrated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00879653
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  • 3
    Digitale Medien
    Digitale Medien
    Water vapour transport of the pre-monsoon period and the general performance of the Indian summer monsoon (1982)
    Springer
    Pure and applied geophysics 120 (1982), S. 67-78 
    Details
    ISSN: 1420-9136
    Schlagwort(e): Monsoon ; Transport ; Tropical meteorology ; Water vapour
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The advective monthly mean transfer of water vapour in the layer below 700 mbar is investigated for India for the years 1962 to 1972 and for the months January to September. The average zonal and meridional components of the transfer of water vapour for India are obtained. They are further averaged for different combinations of the pre-monsoon months from January to May and are correlated with the summer monsoon rainfall. The correlation coefficients for zonal transfer of water vapour are either negative or small positive for different combinations of the months mentioned above. The correlation coefficients for the meridional transfer of water vapour are positive. The maximum value is 0.74 for the March to May combination and is statistically significant at the 1% level. An extensive investigation is, therefore, made for the March to May averages of water vapour transfer for four broad regions of India. The parameters of water vapour transfer for these regions are compared with the threshold values and the prediction category, normal or drought, for the subsequent summer monsoon season is determined for all years. The correlation coefficient between the index of drought, as determined from parameters of water vapour transport and rainfall departure, is statistically significant at the 2% level.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00879427
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  • 4
    Digitale Medien
    Digitale Medien
    A note on the necessary condition for baroclinic instability of monsoon zonal current (1982)
    Springer
    Pure and applied geophysics 120 (1982), S. 453-462 
    Details
    ISSN: 1420-9136
    Schlagwort(e): Baroclinic instability ; Monsoon ; Zonal current
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract Analytic expressions are derived for the minimum easterly and westerly jet strengths necessary for baroclinic instability, in terms of their half-widths and location. For this purpose the necessary condition for an internal jet is utilized and the jets and static stability are represented by simple mathematical functions. Dependency of the minimum jet strengths to their half-width and location are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00879829
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  • 5
    Digitale Medien
    Digitale Medien
    Application of a stochastic model to the frequency and duration of monsoon rainfall (1982)
    Springer
    Pure and applied geophysics 120 (1982), S. 79-94 
    Details
    ISSN: 1420-9136
    Schlagwort(e): Monsoon ; Rainfall ; Tropical meteorology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The paper deals with an application of a stochastic model to the frequency and duration of precipitation events. With the aid of the model, the magnitudes ofmth highest rainfall amount in 24 hours' duration with 97.5% probability are obtained for various climatic regimes over a tropical monsoon region. There is good agreement between them-day minimum rainfall estimated through the model and the observed value. The model satisfactorily explains the frequency of the extreme rainfall event.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00879428
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  • 6
    Digitale Medien
    Digitale Medien
    Extensions of linear discriminant analysis for statistical classification of remotely sensed satellite imagery (1980)
    Springer
    Mathematical geology 12 (1980), S. 367-376 
    Details
    ISSN: 1573-8868
    Schlagwort(e): discriminant analysis ; remote sensing ; satellite imagery
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Mathematik
    Notizen: Abstract Linear discriminant analysis is a commonly used statistical tool for the classification of surface features using satellite surface reflectance data. Extensions of this basic tool promise substantial improvements. In particular, we examine the added effectiveness of the integration of spatial autocorrelation into the discriminant model, the resolution of nonhomogeneous pixels, and data based prior probability estimates of class membership.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01029421
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  • 7
    Digitale Medien
    Digitale Medien
    A new look in exploration and development of old producing properties (1980)
    Springer
    Mathematical geology 12 (1980), S. 377-398 
    Details
    ISSN: 1573-8868
    Schlagwort(e): discriminant analysis ; petroleum exploration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Mathematik
    Notizen: Abstract Stepwise linear discriminant analysis and regression function techniques were used to classify and analyze the data from 224 oil, gas, and dry holes drilled to the base of the Silurian Geologic System in southeast Ohio, U.S.A., from 1968 to 1975. These are 8.7% of all wells drilled in the same geographical area over the time interval. The wells were divided into six groups depending on the amount of control the drilling company had over their ultimate completion. Thirteen environmental (geologic and engineering) factors plus location data were collected about each well. Successive groupings of oil and gas wells were used to determine an environmental index which was used to establish the hydrocarbon producing potential of the next group. Discriminant analysis was used to determine whether the wells within each group were classified properly and regression analysis was used to determine a production estimating function. Geophysical well data were used to estimate whether gas or oil was expected. With this dichotomy, production estimating functions which explain 74% of the variation for oil wells and 78% of the variation for gas wells were formulated. Using the discriminant function for these groups as a ranking function the following results were obtained: For oil wells, 18.5% Type II errors for the productive group and 24.4% Type II errors for the nonproductive group; for gas wells, 5.4% Type II errors for the productive group and 17.1% Type II errors for the nonproductive group. By accepting the above Type II errors one is significantly able to reduce the number of noneconomic wells completed that originally should have been considered dry holes. The inverse was tested with three wells and yielded 33% Type II errors. Any area in which adequate data are available is amenable to these types of analysis with their attendant diagnostic capabilities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01029422
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  • 8
    Digitale Medien
    Digitale Medien
    Application of discriminant analysis and generalized distance measures to uranium exploration (1980)
    Springer
    Mathematical geology 12 (1980), S. 539-558 
    Details
    ISSN: 1573-8868
    Schlagwort(e): discriminant analysis ; variable selection ; uranium favorability ; generalized distance measures ; regional variables ; geochemical fingerprint
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Mathematik
    Notizen: Abstract The National Uranium Resource Evaluation (NURE) Program has as its goal the estimation of the nation's uranium resources. It is possible to use discriminant analysis methods on hydrogeochemical data collected in the NURE Program to aid in formulating geochemical models that can be used to identify the anomalous areas used in resource estimation. Discriminant analysis methods have been applied to data from the Plainview, Texas Quadrangle which has approximately 850 groundwater samples with more than 40 quantitative measurements per sample. Discriminant analysis topics involving estimation of misclassification probabilities, variable selection, and robust discrimination are applied. A method using generalized distance measures is given which enables the assignment of samples to a background population or a mineralized population whose parameters were estimated from separate studies. Each topic is related to its relevance in identifying areas of possible interest to uranium exploration. However, the methodology presented here is applicable to the identification of regions associated with other types of resources.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01034743
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  • 9
    Digitale Medien
    Digitale Medien
    Harmonic analysis of cephalopod suture patterns (1981)
    Springer
    Mathematical geology 13 (1981), S. 23-35 
    Details
    ISSN: 1573-8868
    Schlagwort(e): harmonic analysis ; cephalopod sutures ; discriminant analysis ; norm of reaction ; heterochrony
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Mathematik
    Notizen: Abstract Harmonic (Fourier) analysis provides a series of multivariate descriptors that exactly quantifies the shapes of cephalopod suture patterns in the Subclasses Nautiloidea and Bactritoidea, and in four of the eight orders of the Ammonoidea. The method allows the calculation and graphic display of the mean suture patterns of the subclasses and orders studied, and exactly measures the morphological differences between groups. Discriminant analysis provides significant differentiation of the four ammonoid orders using only the harmonic amplitudes of the sutures. Discriminant analysis also indicates significant differences between the two symmetric halves of sutures in Acanthoclymenia neapolitana, and thereby measures the withingenotype norm of reaction in that species. Twelve sutural harmonic amplitudes are significantly correlated with ontogenetic changes in apertural size and shape in Koenenites cooperi. Specific harmonic amplitudes increase monotonically in the ontogeny of K. cooperi, but do not change within the phylogeny of its family, the Gephuroceratidae. This method permits statistical testing of assumptions of heterochronous evolution in cephalopod lineages.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01032007
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  • 10
    Digitale Medien
    Digitale Medien
    A prior probability method for smoothing discriminant analysis classification maps (1982)
    Springer
    Mathematical geology 14 (1982), S. 433-444 
    Details
    ISSN: 1573-8868
    Schlagwort(e): smoothing ; discriminant analysis ; remote sensing ; satellite imagery
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Mathematik
    Notizen: Abstract A statistical method is presented for smoothing discriminant analysis classification maps by including pixel-specific prior probability estimates that have been determined from the frequency of tentative class assignments in a window moving across an initial per-point classification map. The class at the center of the window is reevaluated using the data for that location and the prior probability estimates obtained from the window area. An example using Landsat spectral data demonstrates the effectiveness of the method and shows an increase in classification accuracy after smoothing.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01077532
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  • 11
    Digitale Medien
    Digitale Medien
    Multivariate models for landslide hazard evaluation (1983)
    Springer
    Mathematical geology 15 (1983), S. 403-426 
    Details
    ISSN: 1573-8868
    Schlagwort(e): slope instability ; landslide hazard ; multivariate models ; discriminant analysis ; multiple regression analysis ; land evaluation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Mathematik
    Notizen: Abstract As part of a long-term project aimed at a better understanding of the geological and geomorphological factors that control slope instability phenomena in Southern Italy, multivariate models for assessing landslide incidence hazard were developed and tested in two Calabrian sample areas characterized by different geological-geomorphological conditions. Discriminant analysis, based on a large set of mappable geological and geomorphical variables, is able to discriminate rather successfully between stable and unstable areas or slope units. Multiple regression analysis has also proved to be a useful tool in predicting actual and potential landslide hazard. Consequently, geomathematical models may provide a feasible approach to environmental hazard assessment, particularly when applied within the framework of a wider multidisciplinary project for land evaluation and planning.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01031290
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  • 12
    Digitale Medien
    Digitale Medien
    Spatial pattern recognition by decomposition (1984)
    Springer
    Mathematical geology 16 (1984), S. 217-236 
    Details
    ISSN: 1573-8868
    Schlagwort(e): nonlinear regression ; discriminant analysis ; decomposition of mixtures ; pattern recognition ; geochemistry ; sedimentology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Mathematik
    Notizen: Abstract The decomposition problem—the assignment of sample observations to component populations—is studied in a spatial context. The observations are spatially located and the assignment to component populations takes into account the value of each observation as well as the values of neighboring observations. Both parameter estimation and assignment rules use a new method that integrates a standard multivariate decomposition algorithm with nonlinear regression. The method is illustrated and tested with artificial data. The distribution of the trace component Cr2O3 in recent Lake Michigan sediments is, then, analyzed by the method. It yields a pattern of component populations that is correlated with the Lake's bottom structure and depositional environments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01032688
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