Web based tool to extract data from plots, images, and maps



Projects Available!

June 11, 2014

I have started adding descriptions of a few interesting projects related to WebPlotDigitizer on the discussion forum. These projects are free to be picked up by anyone who wishes to contribute. Even partial contributions will be highly appreciated. Many of these do not require the intimate knowledge of the WebPlotDigitizer code. Look for the posts with [Available Project] in the subject line. If you find something interesting then drop a line in the forum or email me personally. Also, feel free to add to the existing discussions or start something new.

Interpolate Between Dashed Lines and Data Points

June 10, 2014

Thanks to Numeric.js, WebPlotDigitizer can now perform cubic spline interpolations between detected data points (3.3 beta). With this new capability, we can now extract data at definite X-values from XY plots with dashed or dotted lines. This can also be used to interpolate between data points or even smoothen noise in the data.

A new algorithm called "X Step w/ Interp." has been added into the Version 3.3 beta alongside the existing X Step and Averaging Window algorithms for data extraction. The "Width" parameter controls the degree of smoothing for the algorithm. The images below show the effect of changing the Width parameter from 0.1 to 2

This new algorithm works a lot better than the current X-Step algorithm and so this might completely replace the existing algorithm in the app. Also, with this addition, I am considering wrapping up version 3.3 features and focus on updating the user manual and tutorial videos.

Discussion Forum

June 7, 2014

If you have any suggestions, ideas or concerns about WebPlotDigitizer or just wish to discuss data extraction from images, then feel free to join the new discussion forum: https://groups.google.com/d/forum/image-digitization

The version 3.x code base is showing promise and I am open to ideas. Want a desktop version? Want to use this in a different application? Need some new features? Just drop a line on the forum.

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