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Equal to frequency did it! arcgis desktop - Count of majority value for each cell? - Geographic Information Systems Stack Exchange
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12-05-2019
05:37 AM
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I ran 10 classifications (Random Trees) in ArcMap. Each time the output will be somewhat different. I have made a final map based on the majority value of each pixel using cell statistics (majority). I have also produced a map where the number of different class values is reported using cell statistics (variety). Now I want a map that reports the count of the majority value. E.g. the majority value was 2, how many times out of the 10 did value 2 occur for each pixel. I know how I could do this using several steps, but as I am running the iteration of 10 classification on 8 different areas this would be extremely time consuming. My question now is, is there a tool or a simple way to estimate or count the number of times the majority value was reported for each cell? Thanks! /Emilie
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12-04-2019
08:59 AM
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Hi! I have a question regarding Random Trees in ArcMap. I am running “train random trees” and then using the output as input in the “classify raster” tool. When I rerun the process above, using the same parameters in the tools, I get a different output. (I am setting the “max_samples_per_class” to 0 in order to make sure all my training data is used.) I am wondering why this is and have a couple of possible ideas; 1. Is a portion of the training data randomly set aside each time to calculate the variable importance, oob error and etc? If so, how much of the data is set aside? 2. Is the output different each time because the choice of which predictorvariable (choice of which 2 bands in the input image that should be compared) to consider at each tree node is randomized? I am struggling with understanding what the tool actually does behind the scenes? Any inputs or ideas are much appreciated Thank you!
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11-19-2019
12:57 PM
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