### Reconstruction of Data from a Chart or Graph

#### by Danielle Fong

I have here several charts of driving cycles. These are standard plots derived from real traffic data, of velocity versus time. Unfortunately I cannot find the data anywhere. So I hatched a plan: maybe there’s software that will reconstruct data from a graph or chart? Does anyone know? If not, I’ll just write it myself and open source it. It seems like a generally useful thing in engineering and science. It deserves an application (maybe even a web application).

http://www.google.com/search?q=“extract+data+from+a+graph” returns a number of plausible alternatives.

Check out:

http://www.frantz.fi/software/g3data.php

Thanks guys,

Your google-fu is strong.

*bows*

Patience, young padawan, I am an information seeking professional, trained in the use of the google-fu.

Just came across this:

“GraphClick is a graph digitizer software which allows to automatically retrieve the original (x,y)-data from the image of a scanned graph or from a QuickTime movie.”

http://www.arizona-software.ch/graphclick/

Then your post…

Mathematica can do this:

http://groups.google.de/group/comp.soft-sys.math.mathematica/browse_thread/thread/49a15c49ada8c1a8?pli=1