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Classifying Imagery Using ArcGIS: ERROR

Question asked by on May 31, 2019
Latest reply on Jun 17, 2019 by

I am trying out the 'Classifying Imagery Using ArcGIS' at Esri Training page. I am currently at the following exercise and step:

  • Exercise: Create a land cover map using unsupervised classification
    • Step: Classify the data

The instruction is clear enough (although it was not indicated where we can check that the raster has 256 different pixel value). Despite the straight-to-the-point instruction, the 'Iso Cluster Unsupervised Classification' tool keeps throwing back errors at me. And the errors are not one, but 3! I am attaching a screenshot of it below:



I am not sure what I did wrong but this is quite discouraging since I am very eager to explore ArcMap's capacity for image classification finally. Any help would be great cause the errors are not making sense to me in relation to the instruction given. I am using ArcGIS Desktop 10.5.1 and operating on Windows 10.


P/S: Oh, and if someone can tell me how it manages to find that the raster is made up of 256 different pixels would be great too.