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  1. waterdata.usgs.gov › wa › nwisUSGS Gage Datum

    Gage Datum and Elevation. The terms "datum" and "elevation", such as used in the "Location" or "Gage" paragraphs in USGS publication and on Web pages, refers to the base, or 0.0 foot gage-height (stage), for a gage. The term datum is used when the base gage-height has been surveyed in from known benchmarks or with precision GPS.

  2. pubs.usgs.gov › tm › tm3A19Levels at Gaging Stations - USGS Publications Warehouse

    At gaging stations where water-surface elevation or stage is measured, the U.S. Geological Survey (USGS) sets gages to read the stage above a specified reference surface called the gage datum (Kennedy, 1990). Equipment in most gaging stations measures and records stage at a frequency of 15 minutes.

    • 5MB
    • Terry A. Kenney
    • 72
    • 2010

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  4. www.sfwmd.gov › usgs_gage_datum_wca1_20151027Vertical Datum at USGS Gaging Stations & WCA 1 Stations

    Oct 27, 2015 · Routine sensor checks. Compare sensor to reference gage. Reset sensor and correct record if needed. Affects current year data (provisional) Periodic reference gage checks – 1 to 3 years. Rerun levels to check and correct for settling. Start at “base RM” and run to all RMs, RPs, gages. Reset sensor and correct record as needed.

  5. wa.water.usgs.gov › nwis_imgs › dataExplanation of Datum/Elevation - USGS

    The term "datum" and "elevation", used in the "Location" or "Gage" paragraphs, refers to the base, or 0.0 foot gage-height (stage), for a data collection site or gage. The term datum is used when the base gage-height has been surveyed from benchmarks or precision GPS, and the term elevation is used when the base gage-heights has been determined ...

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  7. gdtseminars.com › 2008/03/06 › dimensions-with-datumDimensions with Datum Targets | Geometric Learning Systems

    Mar 6, 2008 · Yes, it is legal, and here is the key: Geometric tolerances are applied to features of a part. A datum target is an imaginary point, line, or area that is simply used for fixturing or gage setup. It’s not the responsibility of a product drawing to worry about the tolerancing of a gage or fixture!

  8. mn.water.usgs.gov › infodata › FAQStreamgagingUSGS Minnesota Water Science Center: Streamgaging FAQs-

    What is the "datum" of a gage? How do I convert the stage or gage-height to an elevation above mean sea level? Why are there different vertical datums used at gages and what are they? How does the stage or gage-height relate to the depth of a stream? How does data get from the streamgage to the internet? How often is data updated?

  9. www-eng.lbl.gov › ~matthewjohnson › Drafting & DesignReceiver Gages — Go Gages and Functional Gages

    19.1 Introduction. Receiver gaging is one of the most effective ways to determine the functionality of workpiece features. There are two members of the receiver or attribute gage family: Functional Gages and GO gages. Functional and GO gages both determine feature compliance with a fixed size boundary; hence they are considered attribute gages.

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