National Geophysical Data CenterThis line shapefile shows lines of equal vertical intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Field (IGRF) for the epoch 2010.0. Magnetic intensity is the strength of the magnetic field, and is described in terms of a horizontal component and a vertical component. Vertical intensity is the vertical strength of the magnetic field. This layer is part of the 1997-2014 edition National Atlas of the United States.These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the U.S. Geological Survey in the use of these data.This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.Shapefilehttps://purl.stanford.edu/pn554xc7879engNational Atlas of the United StatesPublicGeomagnetismMagnetic fieldsGeoscientific InformationMagnetic Field - Vertical Component of the Total Field Intensity for the Epoch 2010.0DatasetsAlabamaArizonaArkansasColoradoConnecticutDelawareFloridaGeorgiaIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew York (State)North CarolinaNorth DakotaOhioOklahomaOregonPennsylvaniaRhode IslandRocky MountainsSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashington (D.C.)Washington (State)West VirginiaWisconsinWyomingUnited StatesCanadaMexicoAlaskaHawaii2010Stanford