The distance that you enter here must be greater than zero.
The mesh spacing must be a greater than zero. It is used for both flow arrows and mesh generation.
The slope angle must be equal to or greater than zero degrees, and less than 90 degrees.
There must be at least two existing DTMs in order to calculate the cut and fill between DTMs.
Insufficient data in the current layer. To create a DTM, activate a layer which has at least three3D loci, or at least one 3D polygon with at least three vertices.
Both of the DTMs you selected must be resident; you must calculate whichever one(s) is(are) non-resident with the "Always recalculate" option turned off.
One or both of the DTMs you selected could not be found.
Both the "from" and the "to" DTMs must be normal DTMs; neither is allowed to be a cut & fill DTM.
The name may not have more than 20 characters.
The name of the DTM and the names of the output layers must be different from each other.
The contour interval must be greater than zero.
The major multiple must be an integer greater than zero.
You must enter a unique name for this DTM and each of its output layers; the name that you entered is already in use.
The DTM name and the output layer names must not be left blank.
The "To" DTM must be totally enclosed by, or have the same border as, the "From" DTM.
You must choose two different DTMs in the popup menus.
Your entry in the selected item is not a valid number.
Neither DTM totally encloses the other.
You must select exactly two DTMs.
The active layer must be one which is associated with an existing DTM.
Could not or did not create the DTM.
To create a new DTM, activate a layer which has at least three 3D loci, or at least one 3D polygon with at least three vertices.
