Map Projections, Coordinates, Scale Topic Flashcards
What shape is the earth?
The earth is an oblate.
This is a spheroid squashed by 1/298th
What is a disadvantage of map projections?
Distortion
What are the three characteristics of a map?
Class
Case
Aspect
Define the map characteristic Class.
It is a developable surface. There is planar cylinder, cone, plane
What are some attributes of cylindrical projection.
The map image is as if you wrapped a cylinder around a globe.
Longitude is equal spacing, parallel a straight lines
Latitude is straight lines but not equally spaced
Top and bottom stretched scale
What is an example of a cylindrical projection?
Mercator conformal cylindrical
What are the characteristics of conic projection?
Like wrapping a cone over one section of the earth.
Longitude lines are diverging straight lines
Latitude are parallel curved lines
What is an example of a conic projection?
Lambert conformal conic
What are the characteristics of a planar projection?
Circular
Longitude lines are straight equally spaced radiating from the centre
Latitude centred circles that are equally spaced
What does the map case refer to?
Where and how the developmental surface intersects with a reference globe.
What is a map aspect refer to?
The position of projection centre.
Equatorial
Polar
Oblique
True or False
Is Earth a sphere?
False
What method do we use to ‘unroll’ the earth and make it flat
Projection
What are the advantages of a globe?
Directions, distances, areas and angles all remain true
What are the disadvantages of a globe?
Small scale with little detail
Difficult to carry around
Bulky to store
Costly to reproduce
What are the four components that are important to preserve in a map
Angles
Area
Distance
Direction
What is a compromise projection?
A projection that maintains only a few of the four components and alters the others
Give an example of a compromise projection
Robinson projection
Longitude is used in ________ to _________ measurements
Ease, West
Latitude is used in _________ to _________
Measurements
North, South
What are Graticules?
In cartography a network of lines representing lines of latitude and longitude
What does UTM stand for?
Universal transverse Mercator
What type of projection is transverse Mercator projection?
Cylindrical
True or false:
The cylinder of a transverse map comes into contact at the equator.
False, it comes into contact at the meridian of longitude
What is a non-coordinate system?
Postal codes/ postal address
A scale is a …
Representative fraction
True or false
Representative fractions have units
False
Large scale map has ______ objects, small scale map has _______ objects.
Large, small
True or false
Large scale maps illustrate more detail than small scale maps.
True
