Metric land measure is a system of measurement used in many countries around the world. It is based on the metric system, which was developed in France in the late 18th century. The term 'metric land measure' refers to the measurement of land in terms of meters, centimeters, and millimeters. ARE is an abbreviation for 'are', which is a unit of area equal to 100 square meters. DECARE is an abbreviation for 'decare', which is a unit of area equal to 10, 000 square meters.