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Staff
Posts: 203
Registered: ‎02-12-2016

Re: Accuracy Assessment Issues

[ Edited ]

If you run Accuracy Assessment, open the same image file you uploaded, then Report > Accuracy Report. Your accuracy report should show the result Ian posted, even starting at older versions 2014 and later.

 

If you run Accuracy Assessment and use Edit options (e.g. Edit > Create/Add Random Points...), the accuracy report could list blank classes.

 

If the previous posts do not explain what you are observing, you should submit a Support ticket to investigate this more thoroughly.

 

Regards,

Jeff

mc
Occasional Contributor
Posts: 7
Registered: ‎10-05-2018

Re: Accuracy Assessment Issues

Thank you both for the advice.  I sort of combined the two.  If I add points and add reference classes and save the table, close and re-add the image, then run Accuracy Assessment, it works.  The only trouble then is it doesn't use the Class_Names but 'Class 1', etc.  But I can live with that - easier than scrolling through multiple lines/pages of values.  thanks again for the help.

Technical Evangelist
Posts: 710
Registered: ‎10-01-2015

Re: Accuracy Assessment Issues

Hi mc,

 

are you you sure it isn't using Class_Names? The file you sent had an attribute column called Class_Name (no "s"), which wouldn't be recognized as a column to use for the names. 

 

Cheers

 

 

 

Ian Anderson
Chief Product Owner, Desktop Remote Sensing
Hexagon Geospatial
mc
Occasional Contributor
Posts: 7
Registered: ‎10-05-2018

Re: Accuracy Assessment Issues

Fairly certain.  The 'Class_Name' field has names in it.  As you say, it didn't use the names but if I run without saving and reopening (the one with 256 values), it does put class names in.  But it won't be a big deal.  Even if the classification goes to more classes, they'll be aligned by rows and it's easy enough to refer back to the attribute table.  Thank you again for your help.

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