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Buffer based on elevation

BenjaminMauck

Hi,

I have a wetland shapefile overlying a 2m LIDAR DEM.

I want to create a buffer around this wetland layer that shows the increase in wetland area if the regional groundwater table increased by 1m in elevation. Thus the width of the buffer is dependent on the catchment slope.

The wetland layer has no associated elevation.

Thank you for your help.

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LukeSturtevant

What type of attribute fields do you have in your polygon layer? How are you analyzing the groundwater table elevation? Do you have a mean slope field for each polygon?

BenjaminMauck

I am using it has a theoretical exercise and assuming a 1m rise in groundwater levels. The wetland .shp is merely location with some vegetation info. I do not have a slope field for every polygon.

Would it be easier to carry this out as a raster calculation?

LukeSturtevant

I may not be fully understanding what you are trying to do, but if you have a DEM you could run it through Slope—Help | ArcGIS for Desktop to get a slope raster. Then run Zonal Statistics as Table—Help | ArcGIS for Desktop using the slope and wetland polygon layer. You could then Join Field—Data Management toolbox | ArcGIS for Desktop with the zonal statistics table to your wetland polygon and then run Buffer—Help | ArcGIS for Desktop based on the mean slope field.

BenjaminMauck

The objective is to identify the new size of the wetlands based in increased groundwater level. So if the groundwater level increase by 1m and the assumption is that all the land surrounding the wetland (up to 1m in elevation above the wetland) will become inundated. So I need a buffer to represent this increase in wetland size based on the current height wetland and the surrounding land of an elevation of 1m that is assumed to be inundated under these conditions. So it is dependent on the elevation relative to the wetland elevation.

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