Location canvas for me means that you can imagine yourself moving in space or space moving around you. It is the ability to see where you are with eyes closed, objects moving past as you go and turn blind. The ability of the native navigators described in The Last Navigator which could do something like mental triangulation to an amazing degree (good enough fro Mau Pialug to navigate from Hawaii to Tahiti unaided).

For example when I close my eyes and turn my head I see schemes of my environment staying in their place. It is precise enough for me to walk more than ten steps, seeing trees and lamp posts pass and then turn and correctly pointing toward an object when I open my eyes.

Concept canvas means that concepts and ideas are tangible objects that you can arrange and combine consciously. Taking once concepts and projecting it along an analogy toward another concept and 'seeing' how the parts fit. Embedding one concept in another.

For me this is closely related to the visual canvas (which is more like a technical drawing: black and white and more contour lines and description-like features than textures and shades). When I say 'embedding in' that conjours an 'inside'-relation where one concept is in the node of another (often in the way of graphs with edges connecting elements and I can use topological transformations on these (projecting, distortion, neighborhood, containment).