For technical applications EOF to study the variability of rainfall will reduce the amount of data to only the dominant mode and can explain the changes of precipitation in a clear overview. The algebraic essentials of EOF analysis can be described as follows. In the EOF technique, the data was collected as a grid of the study area. The data are first arranged into matrix where is the rainfall amount collected at the time and station . Which are arranged data as shown figure 1.
The EOF technique is a useful technique in meteorology and oceanography for descriptive multivariate statistics. It is based on a representation of the large data sets in terms of a limited number of orthogonal basis functions while retaining as much as possible of the variation in the data [7].
In the EOF technique the data are first arranged into a matrix where is the rainfall amount collected at the time