Mapping Flashcards
what is three dimensional, most accurate model of the earth, and not convenient because of its size
globe
what is 2-dimensional and is not as accurate as the globe
maps
all maps have
distortion
what are mapmakers called
cartographer
different ways of drawing the world map
projections
distorts the areas near the poles
mercator projection
shows earths poles and distorts landmass shaped away from the center
gnomonic projection
least distorted and useful for mid-latitudes, most distorted near the equator
polyconic projection
lines that measure north and south (equator)
latitude
lines that measure east to west (prime meridian)
longitude
latitude and longitude are broken down into (think time wise) ex. 30 degree 54’ 20’’
minutes and secs, 60 mins in a degree, 60 secs in a min
where is the equator located (degrees)
0 degrees latitude
where is the prime meridian located (degrees)
0 degrees longitude
where is the north pole located
90 degrees N
where is the south pole located
90 degrees S
how many hours is one rotation for earth
24
how many degrees per hour
15
because there are 24 time zones every 15 deg longitude is
a 1 hour difference
which way does the world spin
counterclockwise
time zones on the east are ________ of the west
ahead
why are time zones not always straight
they avoid cities so its less confusing
what is a topographic map
a map showing relief features such as mountains, hills, and valleys (2D representation of a 3D world)
what are contour lines
lines joining in points of equal elevation relative to sea level
contour lines next to each other show what
change in elevation
what is the contour interval and what happens every 5th contour interval
difference in elevation between 2 lines that are next to each other, index contour which is always bold and shows a number
contour lines that are closer together represent:
contour lines that are farther apart represent:
steeper slope
gentler slope
contour lines that form a circle show
hills or mountains
what is it called when hatch marks or teeth are shown on the contour lines pointing to the center
depression
what do contour lines never do
never cross, split, or divide
contour lines make a __ shape when crossing a stream and a __ shape when going up on a valley
u,v
slope and gradient are measures of ________
steepness
equation for gradient
change in elevation/ distance traveled
topographs can sometimes show a picture/plot that show the what
shape of the surface of the ground
