How to export a polygon based on elevations using a DTM or a DEM

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I have a Lidar generated DTM and a DEM (accurate to 10x10 feet). I am trying to export a polygon within a boundary which includes all elevations below a specific number. Seems like this should be simple but I am having a hard time. Ideally, I would like this to be accurate to 0.5 ft.

Also, I no longer have a 3d analyst license. If that is the only way to deal with the DTM, I may procure a new license.

Thanks in advance.



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