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I'm trying to run a supervised classification on a landsat 8 (L8 OLI/TIRS COLLECTIONS LAND SURFACE REFLECTANCE ON-DEMAND) imagery. I created a signature file, then ran the Maximum Likelihood classification tool, but the output wasn't what I anticipated- which was to get a classified raster. Instead I got a black and white raster with high to low values ranging from 152-62.

I used the Image Classification Window (training samples, maximimum likihood, etc.) as seen: enter image description here

I created the training samples with the draw polygon option, then used the Training Sample Manager to create he classes. The classes were, Agriculture, Water, Urban, and Bare Earth. The values used were automatically generated by ArcMap, as seen below: enter image description here

The parameters used were as follows: enter image description here

The results were: enter image description here

I tried running an unsupervised classification, and that did s classification, so I'm not exactly sure what I'm doing wrong.

  • What type of classes are you working with? Did you select pixels on screen to generate training data? What values did you assign the classes in the training data? – Aaron Dec 31 '18 at 4:00
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Thank you Aaron21 for your question, it forced me to reexamine the automated values that were generated for the training samples by arcmap. I changed the values to consecutive (1-4) to represent the classes and it worked. My classifications were generated successfully! Key thing to remember when running the tool-ONCE TRAINING SAMPLES ARE CREATED AND MERGED INTO APPROPRIATE CLASSESS, ASSIGN VALUES THAT WOULD CORRESPOND TO EACH CLASS. DO NOT USE THE DEFAULT FIGURES.

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