Ascertain Dimensions is a term used to describe the process of measuring something. It involves taking precise measurements of an object or area in order to determine its size and shape. This is often done using specialized tools such as rulers, calipers, and tape measures. The measurements taken can then be used to create a detailed map or blueprint of the object or area. Knowing the exact dimensions of an object or area can be important for many reasons, such as when designing a building or creating a product.