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- Vertical_deflection abstract "The vertical deflection (deflection of the plumb line, astro-geodetic deflection) at a point on the earth is a measure of how far the direction of the local gravity field has been shifted by local anomalies such as nearby mountains. (Here "gravity" means apparent gravity—true gravity "reduced" by the earth's spin). They are widely used in geodesy, for surveying networks and for geophysical purposes.The vertical deflection (abbrev. VD or ξ,η) is the angle between the true zenith (plumb line) and the line perpendicular to the surface of the reference ellipsoid chosen to approximate the earth's sea-level surface. VDs are caused by mountains and by underground geological irregularities and can amount to angles of 10″ (flat areas) or 20–50″ (alpine terrain)[citation needed].The deflection of the vertical has a north-south component ξ and an east-west component η. The value of ξ is the difference between astronomic and geodetic latitude; the latter is usually calculated by geodetic network coordinates. The value of η is the difference between the corresponding longitudes. When a new mapping datum replaces the old, with new geodetic latitudes and longitudes on a new ellipsoid, the calculated vertical deflections will change too.The NGS website gives vertical deflection anywhere in the United States here and here.".
- Vertical_deflection thumbnail GRAVIMETRIC_DATUM_ORIENTATION.SVG?width=300.
- Vertical_deflection wikiPageExternalLink deflec09_prompt.prl.
- Vertical_deflection wikiPageExternalLink deflec99_prompt.prl.
- Vertical_deflection wikiPageID "938659".
- Vertical_deflection wikiPageRevisionID "588082375".
- Vertical_deflection hasPhotoCollection Vertical_deflection.
- Vertical_deflection subject Category:Geodesy.
- Vertical_deflection subject Category:Geophysics.
- Vertical_deflection subject Category:Gravitation.
- Vertical_deflection comment "The vertical deflection (deflection of the plumb line, astro-geodetic deflection) at a point on the earth is a measure of how far the direction of the local gravity field has been shifted by local anomalies such as nearby mountains. (Here "gravity" means apparent gravity—true gravity "reduced" by the earth's spin). They are widely used in geodesy, for surveying networks and for geophysical purposes.The vertical deflection (abbrev.".
- Vertical_deflection label "Deviazione della verticale".
- Vertical_deflection label "Déviation de la verticale".
- Vertical_deflection label "Lotabweichung".
- Vertical_deflection label "Vertical deflection".
- Vertical_deflection sameAs Lotabweichung.
- Vertical_deflection sameAs Déviation_de_la_verticale.
- Vertical_deflection sameAs Deviazione_della_verticale.
- Vertical_deflection sameAs m.03rstv.
- Vertical_deflection sameAs Q159914.
- Vertical_deflection sameAs Q159914.
- Vertical_deflection wasDerivedFrom Vertical_deflection?oldid=588082375.
- Vertical_deflection depiction GRAVIMETRIC_DATUM_ORIENTATION.SVG.
- Vertical_deflection isPrimaryTopicOf Vertical_deflection.
