Criminal Sentence 481: Painter or Police Officer?

From a book I'm reading:

"I'll canvas the area over there."

Oh, and this was spoken by a police officer.

To canvass, with two S's, is to inquire, as in to canvass the neighborhood by knocking door to door and asking residents questions.

Canvas, on the other hand, isn't a verb. It's a noun and it's that thing on which painters create their art. Or maybe someone is going to put canvas on that area over there.