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- Q159914 subject Q6429350.
- Q159914 subject Q7037494.
- Q159914 subject Q8482453.
- Q159914 abstract "Template:ForThe 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).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.".
- Q159914 thumbnail GRAVIMETRIC_DATUM_ORIENTATION.SVG?width=300.
- Q159914 wikiPageExternalLink deflec09_prompt.prl.
- Q159914 wikiPageExternalLink deflec99_prompt.prl.
- Q159914 wikiPageWikiLink Q1009329.
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- Q159914 wikiPageWikiLink Q6429350.
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- Q159914 wikiPageWikiLink Q7037494.
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- Q159914 wikiPageWikiLink Q8482453.
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- Q159914 comment "Template:ForThe 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.".
- Q159914 label "Vertical deflection".
- Q159914 depiction GRAVIMETRIC_DATUM_ORIENTATION.SVG.