Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: A team of surveyors takes measurements of ground altitude at horizontal intervals of 1 meter over a 400 square meter area. These measurements can best be used to produce which representation of the area?
a topographical map
Digital Elevation Model (DEM).