What is the term for a professional on-site measurement of the lot lines and dimensions of a property?

The correct term for a professional on-site measurement of the lot lines and dimensions of a property is "survey." A survey involves calculating and mapping the specific boundaries of a property, which is crucial for determining the exact size and limits of a parcel of land. Surveyors utilize precision tools and techniques to create accurate representations of property lines, helping to prevent disputes over land ownership and ensuring compliance with local zoning and development regulations.

In contrast, an abstract is a document that provides a summary of the legal history of a property, while an appraisal refers to the process of evaluating a property's market value based on various factors such as its condition, location, and comparable sales. An inspection typically involves examining a property to assess its condition or identify issues, but it does not focus on measuring the physical boundaries. Hence, "survey" is the appropriate choice for defining the professional measurement of lot lines and dimensions.