•show larger area map and has bigger scale (1:50 000)
•shows physical and man-made features
•shows less detail but has a a key
•more expensive to make
What are the characteristics of a topographical map?
A Orthophoto map is a birds eye view picture map combined with a topographical map
What is a Orthophoto map?
•smaller area map, has smaller scale but the picture is enlarged of a certain area (1:10 000)
•shows more detail
•is in black and white
•has no key
What are the characteristics of a Orthophoto map?
The amount by which the represented reality has been reduced on a map
What Is the definition of scale?
This is the the amount by which represented reality has been reduced and is shown as a fraction eg. 1: 50 000
What is a fraction scale?
A straight line marked off in cm's representing the ground distance in km
What is a linear scale?
1:50 000 = 1cm on the map is equal to 50 000cm on the ground in reality
What is an example of a word scale?
There are four ways:
•contour lines= all places on this line are above sea-level
•spot height= the exact height of the dot, is equal to 1 decimal place
•trigonmetric beacon= trig beacon no. Is measured in meters above sea-level
•bench mark= the point on the road above sea level
How many ways can altitude can be expressed and what are they?
The point of intersection between 2 lines of longitude an lines of latitude
What is a grid reference?
Grid references are used to give exact locations of particular places on the map.
What are grid references used for?
Latitude is always south and longitude is always east
What is specific with grid referencing in south Africa?
An approximate way it describing the position of one place in relation to another.
What is direction?