Albedo is the ratio of the amount of electromagnetic energy reflected from the surface to the amount of energy incident on it. Apogee is a point in the elliptical orbit of a terrestrial satellite which is farthest from earth. Ascending node is the point at which a satellite travelling south to north crosses the equator. Bathymetry is the science of measuring and charting the depths of objects under water. Cartogram is a map where geographical areas are distorted in proportion to the value of an attribute. Choropleth is a thematical map. Here areas are either colored or shaded to denote the density of the mapped phenomenon. Conflation is a method to align the features of two geographic data layers. A boundary shared equally by two geographical areas is called conjoint boundary.
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