Book Image

Time Series Indexing

By : Mihalis Tsoukalos
Book Image

Time Series Indexing

By: Mihalis Tsoukalos

Overview of this book

Time series are everywhere, ranging from financial data and system metrics to weather stations and medical records. Being able to access, search, and compare time series data quickly is essential, and this comprehensive guide enables you to do just that by helping you explore SAX representation and the most effective time series index, iSAX. The book begins by teaching you about the implementation of SAX representation in Python as well as the iSAX index, along with the required theory sourced from academic research papers. The chapters are filled with figures and plots to help you follow the presented topics and understand key concepts easily. But what makes this book really great is that it contains the right amount of knowledge about time series indexing using the right amount of theory and practice so that you can work with time series and develop time series indexes successfully. Additionally, the presented code can be easily ported to any other modern programming language, such as Swift, Java, C, C++, Ruby, Kotlin, Go, Rust, and JavaScript. By the end of this book, you'll have learned how to harness the power of iSAX and SAX representation to efficiently index and analyze time series data and will be equipped to develop your own time series indexes and effectively work with time series data.
Table of Contents (11 chapters)

Trying something radical

In this section, we are going to try a different kind of visualization for visualizing an iSAX index, just in case it reveals any extra kind of information. So, we are going to use a Radial Tree structure instead of a regular tree. For that, we need to go to the TreeRadialTidy directory inside the ch06 directory and replace the JSON file found in the files directory with 100k.json – the correct file is already there. However, if you want to use your own data, you should update that file.

Next, we should run the Python HTTP server and point our web browser to http://localhost:8000/. The generated output is presented in Figure 6.5:

Figure 6.5 – Using a Radial Tree structure

Figure 6.5 – Using a Radial Tree structure

What kind of information can we get from Figure 6.5? Is that better than a regular tree structure? I do not know whether it is better or not, but it surely presents the same information in a totally new way!

One advantage of the radial tree...