When I sketch quickly I am trying to get the idea of where trees, buildings, water etc. are placed in comparison to each other. This includes the need to understand the size of one item in relation to another. For me, it is sometimes difficult to get the angles and lines of buildings to show the correct perspective.
As well, there is a need for me to get the feel or the essence of the place. Usually, this is best displayed in the items in nature, not in the buildings themselves. It becomes about documenting a time, and place. I just completed a quick and cheeky road trip to Florida which allowed me to do just that. A time to sketch and photograph where I was and the feelings that were there.