Notes

• Input data is assumed to follow the geographic convention, where angles are measured in degrees and clockwise from north (i.e., the positive Y-axis).
• Colors were deliberately avoided to ensure the charts remain legible in printed (grayscale) form.
• The statistics in the Raw Data Plot are defined as:
  • md: mean direction (in degrees)
  • mrl: mean resultant length (range: 0 to 1)
  • csd: circular standard deviation (range: 0 to 2)
• In the Rose Diagram, the radius of each sector is proportional to the square root of the group's relative frequency. This means the area of each sector reflects the actual group frequency. In contrast, the Wind Rose diagrams use bar lengths and sectors that are directly proportional to the group's relative frequencies.
• The percentage of zero (0) speed values, representing calm conditions, is displayed in the charts. Please note that only valid numeric values are accepted; do not use placeholders such as -1, 999, or NaN for zero speeds.
• While somewhat rudimentary, the Vector Stick plot can be made more readable by adjusting the vector length and separation parameters.

Credits

Libraries and frameworks used in Directional Charts:

• Bootstrap 5 - CSS Framework

• Papa Parse - CSV data parsing

• Day.js - date and time manipulation

• Konva - canvas rendering and visualization

Support This Project

Thank you for using the tools and charts available on this site. Everything here is completely free to use:

• No watermarks on charts
• No daily usage limits
• No fees, subscriptions, or feature restrictions

This platform is maintained independently with the goal of providing accessible and reliable charts for technical and professional use. While there is no charge to use the site, there are ongoing costs involved in hosting, maintenance, and continued development.

If you find the service valuable and would like to support its sustainability, any contribution is sincerely appreciated. Secure donations are accepted via Buy Me a Coffee and PayPal.

About

Directional Charts is a website dedicated to providing free and useful directional data visualizations. It's maintained by me, Leo Guzman, a software developer with a passion for open-source technologies and all things geospatial.

I welcome any suggestions for improvements or bug reports. Please feel free to email me at: kuma@mailfence.com

Privacy Disclaimer

This site does not use cookies, third-party trackers, or advertising identifiers. Basic usage metrics (e.g., page views, device type, country) are collected anonymously via Cloudflare Web Analytics, a privacy-first service that does not store IP addresses, does not use cookies, and does not identify individuals. No personal data is collected, shared, or sold.

Terms and Conditions

1. Use of Directional Charts is at your own risk.

2. The information provided is for general purposes only and should not be relied upon or used as the sole basis for making decisions.

3. We do not warrant the accuracy, completeness, or usefulness of this information.

4. We are not responsible for any losses or damages that may result from the use of Directional Charts.

5. We reserve the right to modify or discontinue any part of Directional Charts without notice.

6. By using Directional Charts, you agree to these terms and conditions.