What is a topographic survey?

A topographic survey is one which measures the relief of the ground surface and depicts or notes the positions of natural and artificial features thereon. To be clear, the term “topographic” refers to the shape of the terrain. To map a lot’s topography (or “topo” for short), surveyors typically utilize a combination of two items: contours and spot elevations.

Contours are lines having a constant elevation. There are a number of rules for contour lines that surveyors must learn very early on. One such rule is that contours do not cross other contours. Another truth about contours that may not be self-evident is that they can not end in space. Of course, promontories and other unique terrain types do not necessarily follow these rules. The foot interval between contours and the choice as to where to place spot elevations is dependent on site specific features and our client’s project goals.

Common elements of a topographic survey:

1. Contour: A line having a constant elevation.
2. Natural and artificial features: Apparent physical attributes of features such as trees, walls and fences on the map.
3. Utility Features: An approximate depiction of the locations of utility lines, gates, and valves on topographic survey maps. The basis for such depiction is usually a combination of “Call Before You Dig” or “Dig Safe” type markings as well as record information and utility sketches provided directly by the utility owner/operators. It is wise to specify that you would like to see the location, size and type of utilities servicing your property of interest if an in-depth evaluation of the property is what you are after.

About Us:

Franklin Surveys has been conducting business throughout the state of Connecticut since 2014. Our firm and its employees are active members of the Connecticut Association of Land Surveyors (CALS) and the American Association for Geodetic Surveying (AAGS).

For more information on professional land surveying and to read about the services that Franklin Services provide, take a look at our land surveying services page or contact our team.