Hello All,
I have a bit of sticky problem and was hoping someone might be able to provide some guidance towards a solution.
The Problem:
I have two DEM Rasters stored in a GDB. One is from 2018 and is approx 0.762 meter x 0.762 cell size, well call it Raster A (fig.1). The other is from 2009 and is approximately 10 meter x 10 meter cell size, well call it Raster B (fig. 1). Raster A is the Topography of a barrier island, while Raster B is the bathymetry surrounding it. My Issue lies in that between the two dates there has been significant erosion of the beach profile so that there is a pretty steep discontinuity between my high-resolution, current data and my older, low-resolution data (fig. 2, fig. 3).
Figure 1
Figure 2
Figure 3: Ideally the slope would look something like the red line drawn.
The Goal:
I need to figure out a way to determine a method which appropriately smooths between the Raster A and Raster B so that the discontinuity is no longer present along the entire coastline (approx. 22 kilometers). Some areas of the coastline exhibit a wider discontinuity than others.
Possible Solutions:
At the moment my only solution is to delete a slice of Raster B around Raster A and then interpolate between the two rasters. I will likely have to make this slice wide enough to encompass all the discontinuous areas. In Figure 4 you can see the first attempt at creating a buffer zone covers the lower section well enough, but not the upper section.
Figure 4: The boundary to the left is the end of the high-res DEM (Raster A). Everything right of that line is Raster B.
I appreciate any and all suggestions!
Thanks,
Russell
Russell
If you convert both rasters to points and use Append to put them into one feature class. If you use an exact interpolator (IDW for example) would won't loose anything. The output cell size should be the smaller of the two rasters. You could also try some of the interpolators that smooth the output, viz., EBK for example.
-Steve