Where the RMSE of Georeferencing is displayed in ArcGIS Pro?

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11-24-2017 12:27 PM
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Honored Contributor

Where the RMSE of Georeferencing is displayed in ArcGIS Pro?

 

I couldn’t figure out where the RMSE of Georeferencing is displayed in ArcGIS Pro.

30 Replies
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MVP Esteemed Contributor

forward and inverse are in the control table apparently

http://pro.arcgis.com/en/pro-app/help/data/imagery/georeferencing-options.htm

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Honored Contributor

I couldn’t find the total RMSE as shown in the screenshots below

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MVP Esteemed Contributor

does it appear after you are done the process? or are these just screen shots as you are going along?  It isn't clear

The interpreting rms error section here suggests you might be more concerned about the individual points.  Perhaps the total has been left out if favor of more detailed information during the collection.

The total error is computed by taking the root mean square sum of all the residuals to compute the RMS error. This value describes how consistent the transformation is between the different control points (links). When the error is particularly large, you can remove and add control points to adjust the error.  Although the RMS error is a good assessment of the transformation's accuracy, don't confuse a low RMS error with an accurate registration. For example, the transformation may still contain significant errors due to a poorly entered control point. The more control points of equal quality used, the more accurately the polynomial can convert the input data to output coordinates. Typically, the adjust and spline transformations give an RMS of nearly zero or zero; however, this does not mean that the image will be perfectly georeferenced.

The forward residual shows you the error in the same units as the data frame spatial reference. The inverse residual shows you the error in the pixel units. The forward-inverse residual is a measure of how close your accuracy is, measured in pixels. All residuals closer to zero are considered more accurate.

Of course if your intent is to reach zero.. then you may fall into the trap of assuming that the minimum number of points that produces a total of zero is the best... this simply isn't the case

A minimum of four links are required to perform a projective transformation. When only four links are used, the root mean square (RMS) error will be zero. When more points are used, the RMS error will be slightly above zero.
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Honored Contributor

What wanted to know here, is where does the RMS Error appear in Pro as it used to be displayed in the “link table” in ArcMap. I fail to find the total RMS anywhere in the Pro.

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MVP Esteemed Contributor

An idea or they have removed it because of total rms error misuse 

Although the RMS error is a good assessment of the transformation's accuracy, don't confuse a low RMS error with an accurate registration.

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Esri Frequent Contributor

Jamal - there is a usability bug for this.  It's in the Product Plan to be improved but do not know what future release.

BUG-000112904 : The box that displays information regarding transformation type, number of control points, and total RMS errors while georeferencing a raster dataset is in an inconvenient location.

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New Contributor III

So the RMSE is not reported at all in PRO? Is this correct?  

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Esri Frequent Contributor

RMSE is supported and reported in AGP - there's a usability bug referenced above to Jamal.

https://pro.arcgis.com/en/pro-app/help/data/imagery/overview-of-georeferencing.htm#ESRI_SECTION1_61F...

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Esri Notable Contributor

Thank you for pointing the bug out Robert LeClair‌.  For anybody on this thread affected by that bug, please visit it on support.esri.com https://support.esri.com/en/bugs/nimbus/QlVHLTAwMDExMjkwNA== and click the Subscribe button.

Not only will that provide you with notifications of the bug's status, but it also provides us a more holistic picture of number of users affected.  Thank you!