The test information can be used for assessing fertility needs and determining approximate locations for varying fertilizer and lime applications. A network of satellites controlled by the Defense Department that are designed to help ground based units determine their current location in latitude and longitude coordinates. GPS is only one technology that is used in Precision Farming to assist you to return to an exact location to measure fertility, pests and yield. An interpolation technique for obtaining statistically unbiased estimates of surface elevations from a set of control points. Latitude is the north to south position.
Longitude is the east to west position.
Precise locations are described in degree, minutes and seconds. To take two or more maps or data sets and combine them together into a single coherent map or database without redundant information. An aerial photograph that corrects distortion caused by tilt, curvature and ground relief. There are usually at least 4 of these satellites that are in view 24 hours a day. The DoD has intentionally introduced error into the signal that is available to civilian users allowing for an accuracy of appropriately 50 yards without differential correction.