Sankey charts, also known as network diagrams or flow diagrams, are a powerful data visualization tool that have gained popularity due to their ability to effectively convey complex data flows and relationships. These maps, named after the British engineer Sir Charles F. P. Sankey who popularized their use in the late 1800s, are particularly useful in fields like engineering, science, business, and data analysis. In this article, we’ll delve into the art and science of creating Sankey charts, exploring their applications and the key features that make them stand out.

Introduction

Sankey charts are an interconnective mapping solution that visually represents data by showing links and their relative volumes. They show a series of vertical and horizontal ‘flows’ or ‘threads’, where each thread represents a flow of data or resource, and the width of the thread indicates the quantity or quantity of the flow. The points of connection between threads represent the sources and destinations of the data, and the flow direction represents the movement or the flow of that information.

Understanding the Structure

A basic Sankey chart consists of three main components:

1. Links: These are the connecting lines that represent the flow between different elements. The thickness and color represent the magnitude of the flow. In the horizontal direction, these links are known as ‘input sources’ and ‘output sinks’; in the vertical direction, they are labeled as ‘transformations’.

2. Nodes: These are the endpoints, representing either input or output sources, or transformation states. Each node has a unique identifier and might have data or attributes associated with it.

3. Values: These are the quantitative data associated with each link. They are usually depicted as labels along the linking lines, often in the form of percentages or volume values.

Creating Sankey Charts

Creating a Sankey chart requires a reliable visualization software like Tableau, Power BI, Google Sheets, Python libraries like Plotly, or specialized chart-making tools like Sankey Diagrams for Excel. Here’s a step-by-step guide for creating a simple Sankey chart:

1. Data Preparation: Organize your data, including input/output sources, transformation states, and the values (quantity or magnitude) to link between them in a tabular format.

2. Choosing a tool: Select a tool that supports Sankey chart creation based on your data and visualization preferences.

3. Building the chart: Input your data, and use the drag-and-drop interface or programming language to construct the nodes, links, and values.

4. Customizing appearance: Adjust colors, labels, and other visual elements to enhance readability and enhance the overall presentation.

Applications

Sankey charts find various applications across industries and research areas:

1. Energy systems: They can represent energy flow in power plants, transmission grids, or renewable energy transitions.

2. Supply chains: Clearing up the movement of goods and services through different stages and stakeholders in a complex supply network.

3. Data analysis: In business, they help understand data flows between departments, products, or customer segments.

4. Environmental impact assessment: Tracking the flow of resources and materials in industrial processes, highlighting areas for improvement.

5. Transportation: Visualizing traffic patterns, transportation routes, or fuel consumption in vehicles.

Key Takeaways

• Sankey charts clearly illustrate data flows and relationships in a structured and organized manner, making it easier for audiences to understand complex systems.

• They can be used as a substitute for textual data, saving space and enhancing readability.

• They facilitate comparison and quantification of information, especially when discussing changes and percentages.

• Customization options in modern tools allow for creative and dynamic representations, catching the viewer’s attention and enhancing data storytelling.

• Using Sankey charts effectively is about selecting the appropriate type, choosing appropriate data points, and interpreting the results to convey a meaningful message.

In conclusion, Sankey charts are a powerful数据分析 and visualization tool that deserve a place in everyone’s data scientist’s toolkit. They are more than just a chart; they are an artful science that simplifies complex flows and helps us make sense of the invisible connections in our world. By mastering the creation and interpretation of Sankey charts, you can unlock the rich insights hidden within your data and communicate them with confidence and clarity.

SankeyMaster

SankeyMaster is your go-to tool for creating complex Sankey charts . Easily enter data and create Sankey charts that accurately reveal intricate data relationships.