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How can I use Didger to digitize a project that uses a logarithmic scale?

 
To digitize a project that uses a logarithmic scale, the project’s projection needs to be set to have Logarithmic axes for the X Axis Type, Y Axis Type, or both prior to digitizing. If the project contains only an image, during the image registration and warping process, the X Axis Type, Y Axis Type, or both axes need to set to be Logarithmic.

 

This can be done in a blank project, by clicking the Map | Set Default Projection command. In the Assign Coordinate System dialog, change the X Axis Type, Y Axis Type, or both to Logarithmic and click OK. Any digitizing will be recorded using the Logarithmic values.

 

This can be done when importing an image during the image registration and warping process in the Assign Coordinate System dialog. When importing an unreferenced image, click the Coordinate System button in the Image Registration and Warping dialog. In the Assign Coordinate System dialog, change the X Axis Type, Y Axis Type, or both to Logarithmic and click OK and OK again. Any digitizing will be recorded using the Logarithmic values.

 

Didger - Image Registration and Warping dialog

 

Updated August 3, 2016

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