MAPWORK

Question 1

WHAT IS BEARING

Answer 1

a direction given as an angle measured from north in a clockwise direction

Question 2

WHAT IS TRUE BEARING

Answer 2

an angle between 0 and 360 degrees measured from the true north line to the line joining the two places that are given in the question

Question 3

MAGNETIC BEARING

Answer 3

an angle measured from the magnetic north line to the line joining the two places that are given in the question

Question 4

MAGNETIC DECLINATION

Answer 4

the angle given in degrees between true north and magnetic north

Question 5

TRUE NORTH

Answer 5

is the geographical north pole

Question 6

MAGNETIC NORTH

Answer 6

the direction that a compass gives as north. it is not the same as true north

Question 7

IN SOUTH AFRICA

Answer 7

magnetic north is always found to the west of true north

Question 8

SCALE
- what is a world scale

Answer 8

“1cm on the map represents 50000cm or o,5km on the ground”

Question 9

SCALE
- what is a ratio scale

Answer 9

“1:50 000”

Question 10

SCALE
- what is a line scale

Answer 10

the line has to be measured

Question 11

DISTANCE
- topographic maps

Answer 11

for every 1cm on the map it represents 50 0000cm in reality

Question 12

DISTANCE
- orthophoto maps

Answer 12

for every 1cm on the map it represents 10 000cm in reality

Question 13

WHAT IS AREA

Answer 13

area is the amount of surface occupied by a feature

Question 14

WHAT IS COORDINATES

Answer 14

give the exact position of a place or feature on a map

Question 15

WHAT IS LATITUDE

Answer 15

• given in degrees
• point north or south (eqautor)
• lines drawn horizontally

Question 16

WHAT IS LONGITUDE

Answer 16

• given degrees
• point east or west (greenwhich meridian)
• lines drawn vertically

Question 17

HOW DOES ALTITUDE WORK

Answer 17

• the height or altitude of a place on a map is given in meters
• gives an indication of the relief or shape of the land and wether its steep or gentle gradient

Question 18

HOW ARE THEY INDICATED

Answer 18

• spot height
• bench marks
• trigonometrical beacons
• contour lines

Question 19

WHAT IS A SPOT HEIGHT

Answer 19

a dot on a map with a num next to it, indicating the height

Question 20

WHAT IS A BENCHMARK

Answer 20

height shown along a road or railway line indicated by an arrow and a number representing the height

Question 21

WHAT IS A TRIGONOMETRICAL BEACON

Answer 21

a physical marker of height that is built on land. every beacon has a specific number (top) and a num representing the height (bottom)

Question 22

WHAT IS CONTOUR LINES

Answer 22

a line drawn on a topographic map to indicate elevation

Question 23

TYPES OF COUNTOUR LINES

Answer 23

• even slope
• gentle slope
• steep slope
• stepped slope
• vertical slope
• convex slope
• concave slope
• valley
• spur
• pass
• poort or water gap
• ridge and saddle
• watershed
• mesa
• butte

Question 24

WHAT IS GRADIENT

Answer 24

measure of steepness

Question 25

WHAT ARE CROSS SECTIONS

Answer 25

is a side view or profile of a natural relief feature on a map

Question 26

PLOTTING A CROSS SECTION

Answer 26

as a graph with a horizontal distance between two points shown on the x-axis and the height of the contour line shown on the y-axis

Question 27

VERTICAL EXAGGERATION

Answer 27

the amount by which the vertical scale of a cross section is larger then the horizontal scale

Question 28

INTERVISIBILLITY

Answer 28

refers to whether one point on the map can be seen from another point