I am using ArcMap and HEC-RAS to model the flood extent in Morpeth.
When trying to use the RAS Geometry-> Stream Centreline Atributes function the error message Operator '=' is not defined for the type DBNull and string "RiverWansbeck1" appears. RiverWansbeck1 being the stream centerline.
Does anyone know what this means and how I can fix it so it will work?
Thanks.
I am not a hydro or a hec user but the error code you are getting is a null value where it was not expected. If you are reading from a dataset/database/FC One or more of the fields being used contains a null value.
If you are coding: You need and test to account for a null values.
Not sure what you are doing, but many times " = " an assignment statement (aka something is given the value of)
If it is a check for equality " == " is often used (aka is something equal to something else)
So your results need to be assessed in terms of assignment or equality checking for the language that is being used.