Surface Volume Units

[FarshadShafiei1]

Hi, I finally managed to create DEM from bathymetry points and calculate the volume, but the output does not make sense. I guess I need to modify the units or coordinates. I don't know how. Here is the output (My input surface is the elevations of the bed in meters above sea level (m asl) in GCS_WGS_1984 and decimal degrees and my Plane Height is the reservoir full supply level (FSL) which is 556.87 m asl:
Plane_Height, Reference, Z_Factor, Area_2D, Area_3D, Volume
556.87, BELOW, 1.00, 0.053866900608273, 126.88623569244, 1.3850421777189
 

[DarrenWiens2]

I don't have access to 3D Analyst, but as with a lot (all?) of the tools in Spatial Analyst, the results will be in terms of the linear unit of your input data. So, in your case, cubic degrees. Project your DEM to get units that make more sense.

[FarshadShafiei1]

My input surface is from Topo To Raster (Type: File Geodatabase Raster Dataset), but when I want to use Raster--> Project, it doesn't let me to choose the Raster file as Input Dataset or Feature Class (The Raster file is not shown_attached screenshot). Do I need to convert the Topo To Raster to a different format first?

 

[DarrenWiens2]

That's only for vector data. Try the Project Raster tool: