I am trying to make smoother contour lines for a map, but none of the usually recommended methods of smoothing a DEM (according to google) are working for the file I have. I have tried smoothing and simplifying the contour lines produced from the DEM, but get a bunch of orthoganal straight lines. Then I read that it is really best to smooth the raster anyways, so I tried boundary clean and majority filter but when I select my raster file to input I get an error that says "Error 000864 Input raster: The input is not within the defined domain. Error 000863: Invalid GP data type." I am inputting a raster though, so I don't understand what the problem is. I am a beginner here though, so maybe there is something really obvious I am missing?
To give a little bit of background, I created this DEM by drawing paths in google earth, saving as .kml, converting to .csv using TCX Converter, then cleaning up the file and saving as .xslx and importing into ArcMap, then exporting as a point shapefile. I don't know if something about the way I created my DEM is making it "odd."
Below is a picture of the contour lines that I currently have.