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+# LBCS Activity Dimension with Detail Descriptions
+Activity is one of five dimensions in land-based classifications. Each dimension is an attribute that takes
+the appropriate four-digit code. Only by using all five dimensions can one fully represent all land uses
+and describe their characteristics. See the other dimensions before applying LBCS.
+
+## Activity
+#### An observable characteristic of land based on actual use.
+Activity refers to the actual use of land based on its observable characteristics. It describes what
+actually takes place in physical or observable terms (e.g., farming, shopping, manufacturing, vehicular
+movement, etc.). An office activity, for example, refers only to the physical activity on the premises,
+which could apply equally to a law firm, a nonprofit institution, a court house, a corporate office, or any
+other office use. Similarly, residential uses in single-family dwellings, multifamily structures,
+manufactured houses, or any other type of building, would all be classified as residential activity.
+
+## Function
+#### The economic use or type of establishment using the land.
+Function refers to the economic function or type of establishment using the land. Every land-use can
+be characterized by the type of establishment it serves. Land-use terms, such as agricultural,
+commercial, industrial, relate to establishments. The type of economic function served by the land-use
+gets classified in this dimension; it is independent of actual activity on the land. Establishments can
+have a variety of activities on their premises, yet serve a single function. For example, two parcels are
+said to be in the same functional category if they serve the same establishment, even if one is an office
+building and the other is a factory.
+
+## Structure
+#### Type of structure or building type on the land.
+Structure refers to the type of structure or building on the land. Land-use terms embody a structural or
+building characteristic, which indicates the utility of the space (in a building) or land (when there is no
+building). Land-use terms, such as single-family house, office building, warehouse, hospital building, or
+highway, also describe structural characteristic. Although many activities and functions are closely
+associated with certain structures, it is not always so. Many buildings are often adapted for uses other
+than its original use. For instance, a single-family residential structure may be used as an office.
+
+## Site
+#### The overall physical site development character of the land.
+Site development character refers to the overall physical development character of the land. It describes
+"what is on the land" in general physical terms. For most land uses, it is simply expressed in terms of
+whether the site is developed or not. But not all sites without observable development can be treated as
+undeveloped. Land uses, such as parks and open spaces, which often have a complex mix of activities,
+functions, and structures on them, need categories independent of other dimensions. This dimension
+uses categories that describe the overall site development characteristics.
+
+## Ownership
+#### Legal and quasi-legal ownership constraints of the land.
+Ownership refers to the relationship between the use and its land rights. Since the function of most
+land uses is either public or private and not both, distinguising ownership characteristics seems
+obvious. However, relying solely on the functional character may obscure such uses as private parks,
+public theaters, private stadiums, private prisons, and mixed public and private ownership. Moreover,
+easements and similar legal devices also limit or constrain land-use activities and functions. This
+dimension allows classifying such ownership characteristics more accurately.
+
+source: [LBCS standards document](https://www.planning.org/lbcs/)