an observable fact or event. (source #5)

A vegetation index (also called a vegetative index) is a single number that quantifies vegetation biomass and/or plant vigor for each pixel in a remote sensing image. The index is computed using several spectral bands that are sensitive to plant biomass and vigor. The most common vegetation index is the normalized difference vegetation index (NDVI). (source #10)

color in an image (such as a photograph) of an object that does not actually appear in the object but is used to enhance, contrast, or distinguish details. (source #5)

a network of uniformly spaced horizontal and perpendicular lines (as for locating points on a map). (source #5)

Ratio of the distance covered by the air to the time taken to cover it. The instantaneous speed corresponds to the case of an infinitely small time interval. The mean speed corresponds to the case of a finite time interval. It is one component of wind velocity, the other being wind direction). (source #8)

a metric unit of length equal to 1000 meters. (source #5)

metre (m), also spelled meter, in measurement, is a fundamental unit of length in the metric system and in the International Systems of Units (SI). It is equal to approximately 39.37 inches in the British Imperial and United States Customary systems. (source #7)

a group of numbers, symbols, etc., that are arranged in rows and columns. (source #7)

the solid rock that lies under the surface of the ground. (source #7)