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Update on Landscape Modeler: it is due to be available on the Esri Marketplace on December 5, 2013.
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11-12-2013
09:29 AM
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The problem is kind of the reverse of a typical sampling problem. Usually, you know your population (N) and want to find the appropriate sample size. In your case, it is easy to get the sample size, but you have to figure out an N value first. The methodology you outline for determining N seems valid...at least it's logical and explainable. I think I would have done exactly the same thing.
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07-16-2012
10:44 AM
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Pete, What I want to know is how to determine the sample size(10%, 20% etc.). The tool you mention is good because it gives you the locations of your sample features but it expects you to know what sample size to use. I have run the PAAT on a 2% sample and a 10% sample of features set up 90% confidence and it gives me the same result. Should I use 2% to finish my assesment faster or should I stick to a bigger sample? Thanks, Ovidio Ovidio, to generate the sample size, use the Auto Calculate function in the Data Reviewer Sample Check (Data Reviewer --> Select Data Check --> Advanced Checks --> Sampling Check). The Auto Calculate function lets you generate a statistically significant sample size by specifying a confidence interval and a margin of error on the confidence interval. Once the tool generates the sample size, you can then use the Browse Results dialog in Data Reviewer to visit the features and read the locations of the features with the PAAT. Alternatively, once the Sampling Check has generated the sample size, you can set up the PAAT's grid with a number of grid cells equal to the sample size. Either method will work. Pete
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01-11-2012
02:03 PM
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Ovidio, I would use the Sampling Check Auto-calculate function in ReViewer to get a statistically significant sample size, then set up your PAAT grid with that number of grid cells.
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01-03-2012
11:30 AM
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Not sure I understand your question...an ASTER DEM is already a raster file with pixel values = elevation.
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07-09-2010
09:45 AM
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