Hi there, 

I am creating a spatially varying roughness file as part of some hydrodynamic modelling I am doing on the GBR. I followed the steps found in another thread to produce a spatially varying roughness file. However, when I generate this file and check it, inside the file are a lot of negative values. I have specified the values I wanted using the polygons and assign values under the operations tab. 

Am I missing a step here as to why it keeps producing a file like this?

I have attached my file so you can see.

Kind regards
​​​​​​​Eleanor