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historical_declination (MapServer)

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Service Description: Magnetic declination is an important concept for accurate navigation. A compass will always point along the lines of magnetic force (which converge on what are called the magnetic poles). The angle between the direction of force and the direction of the geographic north pole is called the declination. If a compass at your location is pointing to the right of true north, declination is positive or east, and if it points to the left of true north, declination is negative or west. As one moves across the surface of the globe, lines of constant magnetic declination are called isogonic lines.

As the earth's magnetic field varies over time, the positions of the north and south magnetic poles gradually change. The magnetic declination at a given location also changes over time. This map displays historical isogonic lines calculated for the years 1590-2020. The modeled north and south magnetic poles (dip poles) are also shown, as well as observed pole locations.

Model description:This map service was designed to be used in the Historical Declination Map Viewer (NOAA GeoPlatform entry).

More information about geomagnetism at NCEI.

Map Name: Layers

Legend

All Layers and Tables

Dynamic Legend

Dynamic All Layers

Layers: Description:

Copyright Text: NOAA National Centers for Environmental Information (NCEI)

Spatial Reference: 4326  (4326)


Single Fused Map Cache: false

Initial Extent: Full Extent: Time Info: Units: esriDecimalDegrees

Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP

Document Info: Supports Dynamic Layers: true

MaxRecordCount: 1000

MaxImageHeight: 4096

MaxImageWidth: 4096

Supported Query Formats: JSON, AMF, geoJSON

Min Scale: 0

Max Scale: 0

Supports Datum Transformation: true



Child Resources:   Info   Dynamic Layer

Supported Operations:   Export Map   Identify   QueryDomains   Find   Return Updates