If you have one, a disto, or laser measure could also come in handy, but not essential.
The site analysis is the process that defines the understanding of the site and related issues.
If you have a choice of when to visit the site try to pick a day when there is a bit of blue sky around.
What are the general neighborhood attitudes about the area? Designs and stories can be exported to a 3D web scene and made available to the public or a select group within an organization.