Topographic maps

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Across
  1. 3. A flat model of all of earth's surface
  2. 4. connects points of equal elevation
  3. 7. Pictures of the surface based on these data
  4. 8. Each bit of a digitized image
  5. 10. Difference between the highest and lowest elevation
  6. 14. Half circle from the north and south poles
  7. 16. One half of a sphere that makes earth's surface
Down
  1. 1. A imaginary line that is halfway between the north and south poles
  2. 2. The shape of the land
  3. 5. The height above sea level
  4. 6. Distance on an map to the distance of the earth's surface
  5. 9. Example,hill, plain, and mountain
  6. 11. Distance in degrees of north and south of the equator
  7. 12. Distance in degrees of north and south of the prime meridian
  8. 13. A system of computer hardware and software used to produce interactive maps of many kinds.
  9. 15. A navigational system that uses satellite signals to fix the location of a radio receiver on Earth's surface.