Manually Digitizing A Line Graph Image

The following steps manually digitize a linear cartesian graph with one curve. These steps are essentially the same as the steps involved in manually digitizing a point graph.

  • Import the testcase.png case from the Samples directory, using File/Import as shown. Not shown are the other methods of importing: using the "-import" command line option, by copying and pasting, and by dragging and dropping
  • Click on the Axes Point button before entering axes points. These will define the coordinate system
  • Click on one of the axes to add the first axes point, then enter its graph coordinates
  • Click on one of the axes to add the second axes point, then enter its graph coordinates
  • Click on one of the axes to add the third axes point, then enter its graph coordinates
  • Click on the Curve Points button before entering curve points. These will contain the digitized graph data
  • Click on the curve to add a curve point. Repeat until the graph is covered with a sufficient number of curve points. If this step is too slow and tedious, you can first automatically digitize entire segments at a time using segment fill
  • Export the curve points into a tabular text file using the File/Export As menu option as shown. Not shown are the other methods of exporting the curve points from the curve geometry window: copying and pasting, and dragging and dropping


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Last-modified: 2007-10-04 (木) 18:08:35 (3945d)