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Horizontal accuracy varies from source contributor to source contributor. However, horizontal positions are usually taken from topographic maps of the area being surveyed. Accuracy may range up to +/- 100 feet.
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Vertical accuracy varies from source contributor to source contributor. However, vertical positions are usually taken from topographic maps of the area being surveyed, monumented benchmark locations, or they are determined by the use of the Global Positioning System (GPS). Accuracy may range from meters to centimeters or better.
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Statistical analysis.
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Gravity data values are the result of the measurement of small variations in the gravitational field of the earth. The magnitudes and ranges of these variations are well known in the potential field discipline.
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Variable: the average acceleration on the Earth's surface is about 980 centimeters per second squared, which is equal to 980 gals, but increases by about 1/2 percent from equator to pole.
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All data were processed by the source before being forwarded to the National Geophysical Data Center
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Susan McLean
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DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
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Boulder
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CO
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USA
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7:30 - 5:00 Mountain
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Contact Data Center
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varies
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1-deg x 1-deg Terrestrial Mean Free-Air Anomalies
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rapp_deg.bin
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Ohio State University
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<gmd:extent gco:nilReason="unknown">
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Release date
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</gmd:DQ_DataQuality>
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<gmd:metadataMaintenance>
<gmd:MD_MaintenanceInformation>
<gmd:maintenanceAndUpdateFrequency gco:nilReason="Unknown"/>
<gmd:dateOfNextUpdate>
<gco:Date>2011-04-22</gco:Date>
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<gmd:maintenanceNote>
<gco:CharacterString>This metadata was automatically generated from the Content Standards for Digital Geospatial Metadata standard version FGDC-STD-001-1998 . Metadata Review Date: 2010-04-22</gco:CharacterString>
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<gco:CharacterString>NOAA/NESDIS/NGDC E/GC2 325 Broadway</gco:CharacterString>
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