US Historic Declination Calculator

This programs derives a table of secular change in magnetic declination for a specified point in the conterminous United States. It utilizes the USD polynomial and the IGRF spherical harmonic models. Declination is calculated using the current World Magnetic Model (WMM) or International Geomagnetic Reference Field (IGRF) model. While results are typically accurate to 30 minutes of arc, users should be aware that several environmental factors can cause disturbances in the magnetic field.

Data and Resources

Field Value
accessLevel public
accrualPeriodicity irregular
bureauCode {006:48}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier gov.noaa.ngdc.mgg.geophysical_models:US_Historic_Declination_Calculator
language {en-US}
modified 2009-12-01
old-spatial {"type": "Polygon", "coordinates": [[[-180.0, -90.0], [180.0, -90.0], [180.0, 90.0], [-180.0, 90.0], [-180.0, -90.0]]]}
programCode {006:059}
publisher DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (Point of Contact)
resource-type Dataset
source_datajson_identifier true
source_hash c62009c88cdd611f4aecc4a9da9ffe9329a8cb4a
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[-180.0, -90.0], [180.0, -90.0], [180.0, 90.0], [-180.0, 90.0], [-180.0, -90.0]]]}
temporal 1750-01-01T00:00:00/2014-12-31T00:00:00
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • ckan
  • doc-noaa-nesdis-ncei-national-centers-for-environmental-information
  • doc-noaa-nesdis-ngdc-national-geophysical-data-center
  • earth-science-solid-earth-geomagnetism-magnetic-declination
  • earth-science-solid-earth-geomagnetism-magnetic-field
  • geo
  • geographic-region-global
  • geoss
  • national
  • nesdis
  • noaa
  • north-america
  • u-s-department-of-commerce
  • united-states
isopen False
license_id notspecified
license_title License not specified
maintainer DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
maintainer_email geomag.models@noaa.gov
metadata_created 2025-11-22T09:24:04.987273
metadata_modified 2025-11-22T09:24:04.987277
notes This programs derives a table of secular change in magnetic declination for a specified point in the conterminous United States. It utilizes the USD polynomial and the IGRF spherical harmonic models. Declination is calculated using the current World Magnetic Model (WMM) or International Geomagnetic Reference Field (IGRF) model. While results are typically accurate to 30 minutes of arc, users should be aware that several environmental factors can cause disturbances in the magnetic field.
num_resources 4
num_tags 16
title US Historic Declination Calculator