Video - Maps and Dispersion (Vocabulary Flashcards)

Vocabulary flashcards covering dispersion concepts, reference and thematic maps, map projections, and distortion.

Dispersion

Spread of a phenomenon over an area; how far things are spread out.

Clustered (agglomerated)

Spatially close together.

Dispersed/Scattered

Spread out.

Reference Map

Displays boundaries and names to identify geographic areas; used for locating features.

Thematic Maps

Maps designed to illustrate a specific theme or variable across geographic areas (e.g., distribution, density).

Choropleth Map

A thematic map that uses colors or shading, easy to recognize distribution

Dot (Density) Map

A thematic map that uses dots to show the distribution or density of a phenomenon.

Isoline Map

Familiar with topographic maps and terrain representations, continuous phenomenon

Proportional Symbol Map

A thematic map where symbol size is proportional to a data value.

Cartogram Map

A map in which geographic areas are distorted in size to reflect a variable’s value.

Robinson Projection

A compromise projection with somewhat distorted polar regions; land area and shape are fairly accurate, especially at the eastern and western edges.

Mercator Projection

Preserves direction and shapes but greatly exaggerates size at high latitudes; poles appear much larger than in reality.

Goode's Interrupted Equal-Area Projection

Shows true size and shape of land masses, but distances are distorted; interrupted to reduce distortion.

Equal-Area Projection

Preserves area across the map, but shapes and distances may be distorted.

Map Distortion

Alteration of shape, distance, relative size, or direction caused by projecting the earth onto a 2D map.

Shape Distortion

Distortion of geometric shapes on a map projection.

Distance Distortion

Alteration of distances between locations on a projection.

Relative Size Distortion

Distortion of the apparent size of geographic areas on a projection.

Direction Distortion

Distortion of directional relationships (angles) on a projection.

Map Distortions

Relative size, Distance, Shape, and Direction

Cartogram

robinson projection

mercator projection

goodes equal area interrupted map

choropleth map

dot (density) map

isoline map

proportional symbol map