Most people have seen surveyors at work—marking boundaries, determining distances, angles and positions. It’s the kind of essential data necessary for all types of construction projects, and is an ongoing endeavor for all cities. The Municipal Archives holds a variety of records from government agencies responsible for surveying what now are the five boroughs, ranging from Brooklyn maps documenting 19th century road placement to aerial photographic maps from the 20th century.  One notable collection of maps and notebooks depicts waterfront development.