Choropleth Maps Flashcards

(16 cards)

1
Q

What does “BOLTSS” stand for in map interpretation?

A

Border, Orientation, Legend, Title, Scale, Source.

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2
Q

How to approach interpreting unusual map patterns?

A

Seek explanations, use as inspiration for exploration, analyze layers for underlying processes.

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3
Q

What are the steps to interpret a thematic map (PQE)?

A

Observe patterns (P), quantify details (Q), identify exceptions (E), explain using prior knowledge.

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4
Q

What is a choropleth map used for?

A

Showing spatial variation influenced by boundaries (e.g., GDP per capita).

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5
Q

Key requirements for choropleth map data?

A

Data must vary spatially and align with enumeration units (not uniform).

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6
Q

How to compare choropleth maps effectively?

A

Use identical legends; boundaries separate areas but don’t carry values.

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7
Q

Why is map scale important for symbol recognition?

A

Ensures symbols/patterns are visible and distinguishable.

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8
Q

How does enumeration unit size affect choropleth maps?

A

Larger units show more detail; varying sizes require standardization (e.g., density calculations).

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9
Q

What issues arise from varying enumeration unit sizes?

A

Shading may misrepresent data; large areas dominate visually.

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10
Q

How to standardize data for choropleth maps?

A

Use ratios (e.g., population/area) or rates (e.g., deaths/population).

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11
Q

What does white indicate in choropleth maps?

A

Missing/no data.

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12
Q

What distinguishes unclassed choropleth maps?

A

No class intervals; each unique value has a unique shade/color.

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13
Q

What are sequential color schemes?

A

Same hue with varying saturation (e.g., light to dark blue).

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14
Q

When to use divergent color schemes?

A

For data centered around a midpoint (e.g., average/zero).

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15
Q

What are qualitative color schemes for?

A

Categorical data (different hues for different categories).

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16
Q

Can color scheme rules be broken?

A

Yes, in specific contexts.