A Piecewise Linear Representation Method of Hydrological Time Series Based on Curve Feature

According to the characteristics of the hydrological time series data, such as the linear drift, the amplitude expansion, the steady migration and the time curve, a new piecewise linear representation method of hydrological time series based on curve feature is proposed in this paper. The method is based on the characteristic points of time series to obtain the characteristic angle and time sampling interval, in the effective extraction of the curve characteristics of the time series, the original data is compressed effectively. The experimental results show that the method has the advantages of high efficiency, simple realization and direct effect, and has good adaptability to the data in hydrology field.