-1

eCognition has the ability to perform an accuracy assessment for classified data by using an error matrix based on a TTA mask. The image shows the results of the accuracy assessment.

Is there a threshold in which the accuracy assessment results are considered satisfactory?

enter image description here

3

I recommend reading Russell Congalton's book Assessing the Accuracy of Remotely Sensed Data: Principles and Practices for a comprehensive analysis of the subject.

Looking at your accuracy assessment, I see two red flags suggesting that the accuracy of the classified product is poor. First, an overall accuracy of 0.4 can be interpreted as saying 6 times out of 10, the class will not correspond to reference data. Second, the Kappa Index of Agreement (KIA) of 0.17 indicates (very) poor agreement between the classified results and reference data

To fully answer your question regarding thresholds for accuracy assessments, Congalton's book references work from Landis and Koch (1977) stating the following (Note that KHAT is comparable to KIA):

Landis and Koch (1977) characterized the possible ranges for KHAT into three groupings: a value greater than 0.80 (i.e., 80%) represents strong agreement; a value between 0.40 and 0.80 (i.e., 40–80%) represents moderate agreement; and a value below 0.40 (i.e., 40%) represents poor agreement.

References:

Congalton, R. G., & Green, K. (2008). Assessing the accuracy of remotely sensed data: principles and practices. CRC press.

Landis, J. R., & Koch, G. G. (1977). The measurement of observer agreement for categorical data. biometrics, 159-174.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.