A storyboard is a visual representation of the story, usually of a video project. A storyboard provides each scene in the narrative and lays out the order and organization of scenes, often with accompanying text. A storyboard often appears like a comic-book page, with each page representing a specific scene. Storymapping is also visual, but it is generally on one page and consists only of text. A storymap allows the reader to break down specific points and ideas into categories using visual organization, generally with squares or circles in which the filmmaker can write.
A storyboard is generally used when developing a video project, as it provides a way for the creator to map out the visual elements of their project. The storyboard always happens before the creation of the video. A storymap is often used to analyze a story by breaking down the different parts and explaining them visually. A storymap can be used to analyze any text, not just a visual one.
A storyboard helps the director or creator of a video to lay out ideas for the final product. A storymap is used to analyze an existing text. Though an individual could use storymapping to brainstorm, it is usually an analysis and not a way of creating a new story, text or piece of video art.
While story mapping can be done by anyone, as it is created with just text, story boarding is a bit more complicated, as it involves drawing and the ability to organize the visuals in a way that makes sense and contributes to the narrative.