This paper explains the characteristics of Transverse Mercator projections, the relationship of plane grids to USGS map cells, and the reasons DRG's and other USGS digital products are projected on the UTM.
âº If two amounts are proportional, they change at the same rate so that the relationship between them does not change: 1  Weight is proportional to size. 2  How far you go is directly proportional to how fast you go (= as one thing increases, the other increases at exactly the same rate).
proportion. 1  ad valorem - A type of customs duties, from Latin, meaning in proportion to the value.. 2  analogy - Comes from Greek analogia, a proportion, such as 2/10 = 10/X, a way of calculating unknown quantities.