Lines on maps Flashcards

1
Q

Describe radial lines

A

data radiates outwards from a central point. Data is plotted at points on the line which are joined or segments. Every variable uses the same scale.

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2
Q

When should you use radial lines?

A

To show the relationship of continuous variables to a central point.

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3
Q

What are the strengths of using radial lines?

A

Show relationship of many variables to a central point.
Can show direction (compass points)
Can compare different subjects easily - overlap polygons.
Shows data trends-(high/low/outlier).

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4
Q

What are the weaknesses of using radial lines?

A

Limited data applies.
Difficult to read exact data if overlaps
Difficult to find a suitable scale when data has a wide range of values.

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5
Q

Describe desire lines

A

straight arrows pointing from the source to the destination of movement.

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6
Q

When should you use desire lines?

A

To show the direction of movement.

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7
Q

What are the strengths of using desire lines?

A

Shows direction of movement
Shows spatial distribution
Clear/visual

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8
Q

What are the weaknesses of using desire lines?

A

Doesn’t show volume of movement
Many lines can overlap and become unclear
Take no account of route.

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9
Q

Describe flow lines

A

arrows pointing from source to destination, arrow width shows the volume of movement.

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10
Q

When should you use flow lines?

A

To show the amount of and direction of movement.

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11
Q

What are the strengths of flow lines?

A

Shows DIRECTION and VOLUME > as width of lines proportional to value
Can give exact data
Clear/visual

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12
Q

What are the weaknesses of flow lines?

A

Many lines can overlap and become unclear.

Difficult to construct and read scale for proportional flow lines if range of values is large.

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13
Q

Describe isolines

A

lines on a map joining all points of equal value. Key types: coutours (equal height); isobars (equal pressure) and isovels (equal velocity (speed).

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14
Q

When should you use isolines?

A

To show data and distribution when change is gradual.

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15
Q

What are the strengths of isolines?

A

Shows DATA and DISTRIBUTION
Can see areas of equal value
Can see gradual changes

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16
Q

What are the weaknesses of isolines?

A

Small lines/numbers/overlap is unclear
Only show continuous data
Only work with large data sets and gradual change