Datum 7 0

Created in: March 2009. Revised: May 2016
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1. Datum 1000b
2. Datum 8040b

Datum synonyms, datum pronunciation, datum translation, English dictionary definition of datum. Data A fact or proposition used to draw a conclusion or make a decision. Where it says 'BIOS from 1991-Present', there is a reference to AMI and the motherboard type, if it is a AMI approved motherboard. This reference looks something like: AMIS875-P, signifying a Series S875 AMI Motherboard (it actually says AMI123-P on the image above as an example). If your computer does not have an AMI reference, refer to your computer providers website for guidance. Welcome to the Creo Schematics 7.0.0.0 Help Center The Help Center provides access to the Help for your application and to other resources such as free tutorials in English, the PTC Creo community, and PTC Customer Support.

Datum 1000b

Accuracy of Transformation

Accuracy of the Source Data

Other Considerations

Accuracy of Transformation Between NAVD 88 - NGVD 29

Topography of the Sea Surface Accuracy

Datum 8040b

Tidal Transformation Accuracy

Tidal Datum Accuracy

References

Users of VDatum should be aware of the potential uncertainties, or errors, in computed heights when applying the software to convert values between vertical datums. Random errors in VDatum may arise from inaccuracies in either the gridded fields employed in the datum transformations, such as GEOID03 or the Mean Sea Level (MSL)-to-Mean Higher High Water (MHHW) transformation, or in the source observational data used to create VDatum, such as the elevation of the tidal datums or the height of the North American Vertical Datum of 1988 (NAVD 88). Sqlpro studio 1 0 165 – powerful database manager salary. The user should also be aware of the existence of measurement errors in his or her own vertical elevation data, i.e. uncertainties related to bathymetric measurement, GPS measurement, leveling, etc.

For the evaluation of VDatum, the standard deviation (SD) is the primary statistical variable used to quantify the random uncertainty in both the vertical datums (i.e., the source data) and of the transformations between them. Standard deviation is a simple measure of the average size of the errors in a data set (when errors are normally distributed). Uncertainties for the source data and transformations in the Chesapeake Bay VDatum region are shown in Figure 1 as an example.

Total random uncertainty for a sequence of conversions such as those used in VDatum is obtained by taking the square root of the sum of the squares of the individual uncertainties. Total uncertainty also includes systematic errors such as those due to land subsidence or sea level rise (The present study currently does not include these systematic errors.). A preliminary assessment of VDatum uncertainty, using the Chesapeake Bay region as an example (see the schematic figure, below), reveals that the uncertainty due to only the transformations from the International Terrestrial Reference Frame of year XX (ITRFxx) through the North American Datum of 1983 (NAD 83), NAVD 88, and Local Mean Sea Level (LMSL) to a tidal datum (i.e., MHHW) can be as large as 7.1 cm (the maximum in Chesapeake Bay occurs when the tidal conversion is to either MHHW or MLLW). An explanation of how this number was computed appears in the Accuracy of Transformations section below. Plan your tasks 2 0 2. In addition, the uncertainty due to only the source data is 5.84 cm. An explanation of how this number was computed appears in the Accuracy of the Source Data section below. Thus, the maximum cumulative uncertainty, obtained by taking the square root of the sum of the squares of the individual uncertainties, is approximately 9.2 cm (7.1^2 + 5.84^2 = 84.52 = 9.2^2). It should be noted that the estimate of errors described above does not include the use of NGVD 29 data. These data have much larger uncertainties as can be seen in the diagram above.

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