### Degrees/Minutes/Seconds (DMS) vs Decimal Degrees (DD)

We can find any location on Earth using latitude and longitude coordinates. And we measure those coordinates with decimal degrees or degrees/minutes/seconds

### Epic Web Maps – The Maps Hall of Fame [Best Maps]

The ultimate list of best maps online. These display state-of-the-art web mapping technology such as live feeds, 3D views and cutting edge visualization.

### Map Scale: Scale Bar, Inset Map and Ratio Text

There are several ways to help readers understand map scale and distance. For example, cartographers use scale bars, locator maps, stated and ratio scale.

### Conic Projection: Lambert, Albers and Polyconic

When you place a cone on the Earth and unwrap it, this results in a conic projection. Examples are Albers Equal Area Conic and the Lambert Conformal Conic.

### The State Plane Coordinate System (SPCS)

The State Plane Coordinate System divides the United States into 124 zones to locate any point with a high level of accuracy (one part in 10,000).

### Map Distortion with Tissot’s Indicatrix

Map distortion is best understood looking at Tissot’s indicatrix. It contains circles and shows how map projections distort shape, size and distances.

### Flow Maps: Linking Movement with Direction Lines

Cartographers use lines to show the movement of phenomenon (people, ideas or money) in flow maps. To show the magnitude, they change the width of flow lines

### Cartogram Maps: Data Visualization with Exaggeration

Cartogram maps distorts reality to convey information. It accomplishes this by resizing and exaggerating any variable using a polygons geometry.

### How to Sketch a Voronoi Diagram with Thiessen Polygons

In a Voronoi Diagram, when you take a point in any given Thiessen polygon, it indicates that it’s closer to that generating point than to any other.

### Choropleth Maps – A Guide to Data Classification

Equal intervals, quantile, natural breaks, pretty breaks- data classification methods generate different choropleth maps. We explain the types of maps here.