Introduction to Charts Flashcards
What’s the difference between maps and charts?
Maps typically contain visual information, charts procedural.
In plain words, what does height-to-diameter ratio of a cone mean?
How steep the cone is.
How are MORA grids formed?
From latitude and longitude.
Define: hypsometry.
Measurement of land elevation relative to SL.
What does spacing between contour lines indicate?
The gradient (slope) of the land.
List the three most common/useful ways of projection.
(1) Plane
(2) Cylindrical
(3) Conic
Define: contour lines.
Lines joining points of equal elevation.
Define: hypsometric charts.
Charts that use contour lines and/or layer tinting to indicate terrain elevation.
What is another name for conformal charts?
Orthomorphic charts.
Define: MORA.
Minimum Off-Route Altitude.
MORAs provide a safety margin above terrain and obstacles in a graticule.
What are the two most desirable properties of a chart?
(1) Constant scale
(2) Accurate angles
Regarding cylindrical projection, indicate:
(a) projection shape
(b) number of touching points
(c) point of origin
(a) cylinder
(b) infinite, along the GCT
(c) centre of the reduced Earth
What are the chart requirements regarding scale, and why is scale important?
On any point on a chart, scale must be constant in all directions.
Constant scale over the entire chart is desirable.
In constant scale, shapes are correct and angles are accurate.
Regarding plane projection, indicate:
(a) projection shape
(b) number of touching points
(c) point of origin
(a) flat plane
(b) one
(c) on the surface opposite to the point of contact
Define: reduced Earth.
Generating globe used for a projection.
