2

I have classified images in ArcGIS Desktop with the support vector machine classifier, and am now struggling with the accuracy assessment. I have only been able to find tutorials on how to do it manually by creating points manually and calculating the kappa index with excel... but I cannot find any detailed steps on how to 'create accuracy assessment points' or 'compute confusion matrix' through ArcGIS, (under spatial analyst tools).

Any pointers?

closed as too broad by ahmadhanb, whyzar, Andre Silva, BERA, MaryBeth Dec 8 '17 at 15:10

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • Please take the community tour here: gis.stackexchange.com/tour and edit your question to only ask one question. – MaryBeth Dec 8 '17 at 15:10
  • To clarify: Are you wanting to run the accuracy assessment from within the ArcMap / ESRI Geoprocessing Tools? – Keagan Allan Dec 12 '17 at 12:15
  • Yes, that would be preferable. – Cecilia Prinsloo Dec 13 '17 at 14:03
  • 1
    Question has been closed...but as a guide...You need to create the Accuracy Assessment Points. Use the classified image as the input and choose "Classified" as the Target Field. Once its run, choose the "Update Accuracy". Use a digitised polygon of known classes, Ground-Truth as the target field. Run it. Then use that in the confusion matrix. – Keagan Allan Dec 13 '17 at 17:45