height above sea level

the difference in elevation between the highest and lowest parts of an area

a navigation system that uses satellite signals to locate a radio receiver on Earth's surface

a sphere that represents Earth's entire surface

a unit used to measure distances around a circle. One degree is equal to 1/360 of a full circle

a flat model of all or part of a surface as seen from above

the process of gathering data for a map by using instruments and the principles of geometry to determine distance and elevations

relates distance on a map to distance on Earth's surface

list of all the symbols used on a map and their meaning

model of the Earth's surface on a flat surface as seen from above