K-means Clustering in R Libraries {cluster} and {factoextra} for Grouping Oceanographic Data

Lemenkova, P.

Автор: Lemenkova Polina
Журнал: International Journal of Informatics and Applied Mathematics
Том: 2
Номер: 1
Год издания: 2019
Издательство: International Society of Academicians
Местоположение издательства: Turkey
Первая страница: 1
Последняя страница: 26
DOI: 10.6084/m9.figshare.9891203
Аннотация: Cluster analysis by k-means algorithm by R programming applied for the geological data analysis is the scope of the presented paper. The research object is the Mariana Trench, a hadal trench located in west Pacific Ocean. The study evaluates the similarity of the geological data by the analysis of their attributes. The original observation data set contained samples varying in parameters: geology (sediment thickness), tectonics (locations on the tectonic plates), volcanism (igneous volcanic areas), bathymetry (depth ranges) and geomorphology (slope steepness and aspect). The data pool was divided to the clusters using k-means algorithm with aim to detect similarities. Clustering was chosen as a main statistical method, since it enables detecting similar groups within the original data set by unsupervised classification. Technically, the research was performed using R language and its statistical libraries. The main R libraries include {cluster}, {factoextra}; minor libraries include {ggplot2}, {FactoMiner}, {openxlsx}, {carData}, {rio}, {car} and {flashClust}. Several clusters were tested from two to seven, the optimal number is defined as five. The results show visualized computations:correlation matrix of the factors; comparison of the bi-factors showing pairwise correlation; pairwise comparative analysis showing influence of the variables as bi-factors: sediment thickness correlating with slope angles; correlation of the volcanic igneous areas with slope angles and aspect degree. Four variables affect geomorphology: slope angle, sediment thickness, aspect degree, bathymetry and volcanism. The paper includes listings of R programming codes for repeatability of the algorithms in similar research.
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K-means Clustering in R Libraries {cluster} and {factoextra} for Grouping Oceanographic Dataстатья

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