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How can I digitize my graph that has one X and two Y axes in Didger? I would like all three variables in the exported data file.

The method to use in Didger to digitize a graph with multiple axes in either direction will depend if you are digitizing from a digitizing tablet or from an imported image.

 

Tablet Digitizing

  1. Open Didger 5 and go to Draw | Tablet | Tablet Calibration and calibrate the tablet using X1 and Y1.
  2. Digitize the line.
  3. Select the line and go to Draw | Resample Polylines.
  4. Choose to Resample along X direction, choose a starting, ending, and increment value, uncheck Create New Line, and click OK.
  5. Once the line is resampled, go to File | Export and export to a DAT file.
  6. Then start a new file (File | New) and calibrate the tablet with X1 and Y2.
  7. Digitize the line.
  8. Resample the line using the same parameters as X1-Y1  (step 4 above)
  9. Export to a DAT file.

 

The X values (X1) will be the same since the lines were resampled using the same parameters. Open the two data files and copy the Y2 data into the data file containing X1 and Y1. Now you will have a data file containing X1, Y1, and Y2 data.

 

Image Digitizing

Didger 3:

  1. Go to File | Import Bitmap | Into Raster Project.
  2. Select the image and click Open.
  3. Click OK and OK in the Bitmap Import Options dialog.
  4. Go to Image | Calibrate Image and calibrate the image using X1 and Y1.
  5. Digitize the line.
  6. Go to File | Export and export to a DAT file.
  7. Go back to Image | Calibrate Image, click Next and simply change the Y values of the calibration points to the corresponding Y2 values.
  8. Click Next, Next, and Finish to exit the calibration.
  9. The line is already digitized, so just go immediately to File | Export and export the data again to a DAT file.


The X data will be the same in the two DAT files because the line did not move, however the Y values will be different. Copy the Y2 data into the data file containing X1 and Y1. Now you will have a data file containing X1, Y1, and Y2 data.

 

Didger 4:

  1. Go to File | Import.
  2. Select the image and click Open.
  3. In the Image Registration and Warping dialog, calibrate the image using X1 and Y1 and click OK.
  4. Digitize the line.
  5. Select the line and go to Tool | Resample Polyline.
  6. Choose to resample along X direction, choose a starting, ending, and increment value, uncheck Create New Line, and click OK.
  7. Once the line is resampled, go to File | Export and export to a DAT file.
  8. Select the line and delete it.
  9. Select the image and go to Image | Image Registration and Warping.
  10. Change the Y values from Y1 to Y2 values and click OK.
  11. Digitize the line.
  12. Select the line and go to Tools | Resample Polyline.
  13. Resample the line using the same parameters as X1-Y1  (step 6 above).
  14. Export to a DAT file.

 

The X values (X1) will be the same since the lines were resampled using the same parameters. Open the two data files and copy the Y2 data into the data file containing X1 and Y1. Now you will have a data file containing X1, Y1, and Y2 data.

 

 

Didger 5:

  1. Go to File | Import.
  2. Select the image and click Open.
  3. In the Image Registration and Warping dialog, calibrate the image using X1 and Y1 and click OK.
  4. Digitize the line.
  5. Select the line and go to Draw | Resample Polyline.
  6. Choose to resample along X direction, choose a starting, ending, and increment value, uncheck Create New Line, and click OK.
  7. Once the line is resampled, go to File | Export and export to a DAT file.
  8. Select the line and delete it.
  9. Select the image and go to Image | Image Registration and Warping.
  10. Change the Y values from Y1 to Y2 values and click OK.
  11. Digitize the line.
  12. Select the line and go to Draw | Resample Polyline.
  13. Resample the line using the same parameters as X1-Y1  (step 6 above).
  14. Export to a DAT file.

 

The X values (X1) will be the same since the lines were resampled using the same parameters. Open the two data files and copy the Y2 data into the data file containing X1 and Y1. Now you will have a data file containing X1, Y1, and Y2 data.

 

Updated October 6, 2016

 

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