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  1. The Elevation of Chicago: A Statistical Mystery | Chicago ...

    Nov 03, 2020 · Adding to the mystery, there are at least three different ways to measure elevation in Chicago: the North American Vertical Datum 1988 (NAVD 88), the International Great Lakes Datum 1985 (IGLD85) and the Chicago City Datum. When the level of Lake Michigan is 580 feet on IGLD85, it is about 580.5 feet on NAVD88 and 1.3 feet on the Chicago City ...

  2. Datum of 2022 - Wikipedia

    4 days ago · The Datum of 2022 is a placeholder name for a new vertical datum set to be produced by the U.S. National Geodetic Survey in 2022 to improve the National Spatial Reference System (NSRS) by replacing the North American Datum of 1983 (NAD 83) and the North American Vertical Datum of 1988 (NAVD 88) with a new geometric reference frame and geopotential datum.

  3. Additional Dwelling Unit toolkit |

    Nov 10, 2020 · compliant ceiling height, especially for basement and attic units, and a sprinkler added in the new unit if you have 2- or 3-family home. The unit cannot involve any bump out, extension, or construction to the existing envelope of the structure that results in the addition of gross floor area.

  4. MTL to NAVD88 Correction - SLAMM Forum

    3 days ago · NAVD 7.176 North American Vertical Datum You can see from these results that, at this site, an elevation of 1.0 meters in NAVD88 units will actually be located below MTL. In this case, the MTL minus NAVD88 will be roughly 1.06 meters. As a general rule, if your MTL-NAVD parameter goes up then elevations go down.

  5. Harris County Flood Warning System

    Nov 07, 2020 · As of July 1, 2007, the elevation datum was changed from 1929 NGVD, 1978 adjustment to the 1988 NAVD, 2001 adjustment. Cross Section Stream Elevation for sensor 1049 is 73.41'

  6. Geodesy - Wikipedia

    4 days ago · In the case of height data, it suffices to choose one datum point: the reference benchmark, typically a tide gauge at the shore. Thus we have vertical data like the NAP ( Normaal Amsterdams Peil ), the North American Vertical Datum 1988 (NAVD 88), the Kronstadt datum, the Trieste datum, and so on.

  7. Crest Considers Ways to Curb Flooding | Environment ...

    Nov 14, 2020 · According to a January survey, 25% of Crest bulkheads meet the current elevation standard set by the North American Vertical Datum (NAVD).

  8. NAD83(HARN) - GeoRepository

    2 days ago · Geographic 2D CRS used in USA - HARN. NAD83(HARN) is a geographic 2D CRS last revised on November 25, 2020 and is suitable for use in Onshore only: American Samoa - Tutuila, Aunu'u, Ofu, Olesega, Ta'u and Rose islands.

  9. Daily Water Flow & Water Conditions for the PNW Area | Avista

    Nov 19, 2020 · The elevation of Lake Spokane at the Long Lake dam is 1535.7, which is at autumn elevation. We expect the elevation of Lake Spokane to stay about the same until sometime in December. It is important to remember that water levels could change drastically due to a variety of factors such as weather or equipment problems at the Post Falls dam.