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Last Post 30 Jun 2016 08:47 AM by  anon
Run ENVI filter tools on LiDAR Canopy Height rasters
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anon



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30 Jun 2016 08:47 AM
    Hi, I originally posted this in the ENVI forum, but I'm re-posting it here because there seems to be a bug in that forum (thousands of posts in a foreign language are making the forum impossible to follow). I'm new to ENVI software, but I've got one simple thing that I'm hoping to do! I'm trying to perform a texture analysis on a series of LiDAR-generated canopy height models in either ENVI or ArcGIS. The height model rasters are in ArcGIS GRID format, and I'm hoping to analyze the texture of a value field representing the height of the forest canopy. I don't mind converting the rasters to another format, but I need to make sure that the height values stay exactly the same. What is the easiest way to go about this? Is there any way to just import the co-occurrence filter tools (specifically mean, entropy, correlation, and variance) into ArcGIS? If not, what's the best file format to import these GRID files so that they retain the same height values that I see in ArcGIS? Thanks VERY MUCH for your help! Jamie

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    01 Jul 2016 10:58 AM
    Hi Jamie, I am afraid that you may need to consult with ESRI to determine how to use ArcGIS to convert your GRID raster into another raster format without changing the pixel values. ENVI can read a wide variety of raster formats, including its own ENVI format, which ArcGIS can write, and TIFF etc. If you are comfortable writing some IDL code to perform the co-occurence measures, and adding that to ArcGIS via Python, then there is a mechanism to do so. You will find information about that in a Help document that is included with the ENVI installation. You can find that Help by going to the Start menu and choosing All Programs > ENVI 5.3 > Help > Tools for the ArcToolbox Help. In that document, under Authoring Custom Tools Tutorial, you should find instructions for doing this. Peg
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