com.github.gwtd3.api.geo

Class Geography

java.lang.Object

com.google.gwt.core.client.JavaScriptObject

com.github.gwtd3.api.geo.Geography

public class Geography
extends com.google.gwt.core.client.JavaScriptObject

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Geography()

Method Summary

Methods

Modifier and Type	Method and Description
ConicProjection	albers() An alias for conicEqualArea(), with USA-centric defaults: scale 1000, translate [480, 250], rotation [96°, 0°], center ⟨-0.6°, 38.7°⟩ parallels [29.5°, 45.5°], making it suitable for displaying the United States, centered around	ConicProjection	conicEqualArea() The Albers projection, as an equal-area projection, is recommended for choropleths as it preserves the relative areas of geographic features.

Methods inherited from class com.google.gwt.core.client.JavaScriptObject

cast, createArray, createArray, createFunction, createObject, equals, hashCode, toSource, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Geography

protected Geography()

Method Detail

albers

public final ConicProjection albers()

An alias for conicEqualArea(), with USA-centric defaults:

• scale 1000,
• translate [480, 250],
• rotation [96°, 0°],
• center ⟨-0.6°, 38.7°⟩
• parallels [29.5°, 45.5°],

making it suitable for displaying the United States, centered around Hutchinson, Kansas in a 960×500 area.

The central meridian and parallels are specified by the USGS in the 1970 National Atlas.

Returns:

the projection

conicEqualArea

public final ConicProjection conicEqualArea()

The Albers projection, as an equal-area projection, is recommended for choropleths as it preserves the relative areas of geographic features.

Returns:

the projection