geography flashcards ( contour lines )
(40 cards)
What is a landform
its a natural phenomenon on the surface of the earth like valley or plateaus
What is a valley
bends towards higher values ( uphill )( in a v )
What is a spur
contours bend towards the lower values ( downhill )( in a upside down U )
Where does a river flow
to the open side of contours
What is a contour lines characteristics
it indicates height
its the brown lines on map
20 m apart
outo map its 5
never cross
far apart - gentle
close together - steep slope
if lines touch- cliff
what is the difference in altitude between two contour lines known as
contour intervals ( normally 20 m apart )
What is a contour line
a line that combines all places with the same altitude above sea level
What makes it possible to see height on maps
altitude
What are the other ways of indicating altitude
spot heights
benchmarks
beacons
contour lines
What is a slope
a slope indicates the steepness of the land
What is the steepness of the slop indicated as
gradient
What is concave and convex
concave is steep then gentle and convex is gentle then steep
What is an Arial photo
photograph taken from an aircraft
What can Arial photographs be distinguished by
colour and the angle of the photograph
What are the different types of angles you can take Arial photographs
vertical ( 90 )
low oblique ( smaller than 45 )
high oblique ( bigger than 45 )
What is the principle of overlapping Arial photographs
to give a clear and complete image
Name a few phenomena of oblique Arial photos
communication
topography
vegetation
settlemnet patterns
Name an advantage and disadvantage of oblique arial phots
show object form the side
cant show scale
Name an advantage and disadvantage of vertical photo
most objects are visible
black and white images can be confusing
What is the aim of overlapping
to ensure no objects are left out
What is an orthophoto
has the charcateristics of a aria photo and a topographical map that are combined to form a orthophoto map
Why can distances be calculated correctly on orthophoto
It is the correct size (to scale).
It shows things in the right place.
Which scale is used at orthophotos
1:10 000
How is altitude indicated on orthophotos
Contour lines – thin brown lines that connect places with the same height.
Spot heights – small black dots with a number showing exact height (e.g. ● 154 m).
Trig beacons – triangles with height numbers (▲ 210 m).