The full colour pin measures approx 32mm across comes complete with descriptive card.
An orbiting observatory that measures the amount of water in the top 5 cm (2 inches) of soil everywhere on Earth’s surface will soon be placed in a polar orbit around Earth. It is called SMAP. This is an acronym made from the name of the satellite. SMAP stands for Soil Moisture Active Passive. A detailed description can be found in the SMAP Handbook (PDF, 4.09 MB).
The topsoil layer is the one in which the food we eat grows and where other vegetation lives. Moisture in the soil indirectly affects us in a variety of ways. In the course of its observations, SMAP will also determine if the ground is frozen or thawed in colder areas of the world.
SMAP is designed to measure soil moisture over a three-year period, every 2-3 days. This permits changes, around the world, to be observed over time scales ranging from major storms to repeated measurements of changes over the seasons.