Portraying earth Flashcards
What is the only true, undistorted representation of earth?
Globe
What is true about maps as a representation of earth?
They have some form of distortion
Which geographic relationship between a map and the true earth does map scale describe?
Distance
Which type of map scale is shown as “1:20,000”
Fractional
Which type of map scale is useful for quick distance estimates and stays accurate if the size of the map is altered?
Graphic
What is not true about small scale maps?
They portray a small area
Which map projection type is ideal for all uses?
None
What is not true about a map projection?
It is always accurate with no distortion
Where is the greatest distortion in a map projection?
Farthest away from the point of tangency
Which type of map projection accurately portrays the shape of continents but not their size?
Conformal
Which map projection is conformal?
Mercator
Which map projection typically shows only one hemisphere, commonly mapping poles?
Planar
Which areas of earths surface are “interrupted” in goode’s projection to minimize shape distortion?
Oceanic regions
What allows map users to assess the reliability of the contents of a map
Data source
What provides an explanation of the symbols on a map?
Legend
Which patterns of isolines show the gentlest gradient?
Slightly right of the center of the map
What is not true about isolines?
Lines far apart show no change in data
What is the ground based system used to correct GPS measurements?
WAAS
What refers to the systems that combine layers of spatial data using high powered computing?
GIS
What are orthophoto maps primarily based on?
Collections of aireal photos
What is the remote sensing system that uses sound waves?
Sonar
