I would like to find local maximum with the moving window 3x3 of a raster image but I don't know how to do this.
Could you please suggest me the way to do this?
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FocalStatistics resources.arcgis.com/en/help/main/10.2/index.html#//… with a statistics type of 'maximum'. You must have a spatial analyst license for this tool.– Michael StimsonCommented Dec 2, 2014 at 6:04
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For anyone who found this page while looking for how to delineate individual canopies, this topic links to this paper: int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLI-B8/563/… It gives step by step instructions on how to delineate canopies in a forested environment from rasters.– alistairCommented Feb 19, 2019 at 16:40
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While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review– BeraCommented Feb 19, 2019 at 18:28
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1 Answer
As mentioned by @Michael Miles-Stimson, the first step is to compute a new raster with the value of the minimum in your neighbourhood. This can be done using Focal Statistics tools.
The second step consists in finding the values of the original raster that are equal to your maximum values. This can be done using the Con tool
Con("raster"=="focal_stat_max", 1)
Note that the "non maximum" will be set to NoData in this case, but you can enter another value if you want (e.g. 0)
Con("raster"=="focal_stat_max", 1, 0)
Finally, you convert this as point using raster to point (optional)
