topograpical maps Flashcards
details on topographical maps
legend and symbols
map scales
contours
compass directions and bearings
4 and 6-figure grids
how are symbols grouped?
in themes on the legend
what are symbols?
things that represent features on the ground
how can scale be shown?
line-scale
statement
representative fraction
line-scale
0____1____2____3km
statement
1cm to 20km
representative fraction
1: 5000000
contour line
line that joins all places of the same height, represents the relief in the terrain depicted
closely-spaced contours represents steep slopes
widely-spaced contours represents gentle slope
no contour line represent flat lant
direction
north
northeast
east
southeast
south
southwest
west
northwest
bearings
measured clockwise from grid north, measured in degrees
eastings
horizontal line
northings
vertical line
how to read a 4 figure grid reference
- find the symbol
- find the bottom left corner of the box it is in
- read along the eastings
- read along the northings
which comes first, eastings or northings?
eastings!!!!!
6 figure grid reference vs 4 figure grid reference
6 fig is more precise
6 fig is used to locate smaller locations
6 fig splits up a grid square into 10 sections along the bottom and the side