I have an existing GDS project. We have since flown new LiDAR. I want to import the new data, but I want to over-write the elevation with my new data. The goal is to run FLO-2D with new elevation data, and see how the water depth/elevation at each grid compares (new versus old). According to the GDS manual, File > Import Elevation Points will ADD imported elevation data to the data. Is there a way to instead overwrite elevation data with imported data? If not, is there another suggestion for how to accomplish my goal?
Sorry I missed your post. You can do this with the GDS but instead of importing the data, you can simply use the Interpolate from Multiple Files option. It will overwrite the old elevation data. If you only want to overwrite a specific area, select that area first with a polygon or shapefile. Your data will need to be in the xyz text file format with space delimiter.
This makes a file with ASCII carriage returns, so I simply copied that file and renamed it “filname.txt”. Within the “Interpolate from Multiple Elevation Files” menu, I had to change the file extension pulldown to “.txt” then let the program do the work.