This lesson addresses how sea level is determined and applied. It starts with a general discussion of the surfaces that form the basis of measurement, called datums, then looks more closely at the vertical datums that form the basis of height measurements. We cover tidal datums in more depth, including the different datums, their extent, period of record (called a tidal epoch), and common applications. We conclude with a look at some data resources for tidal datums and sea level trends.
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gsb12
2020-08-08 19:38:05
Good lesson.
FAISAL ABDULLAH
2018-09-13 16:47:13
It's useful for Surveyor and who study SST.
saradastgheibi@gmail.com
2017-12-31 20:30:10
Very effective course
elias_2015
2017-12-19 14:35:01
THANK´S SO MUCHBEST REGARD´S
bushasarrived
2017-08-22 18:03:39
I gained a better understanding of how datums are determined and how they relate to one another
Ashari Wicaksono
2017-02-21 23:26:12
I am understand about sea surface height
matthew.lancaster
2017-02-21 15:52:18
This was a very good learning experience. The descriptions and diagrams were clear and concisely but thoughtfully explained. I improved my pre-assessment score to the quiz by almost 100%.
Davit2010
2017-01-20 13:38:12
excellent
10081343
2017-01-12 18:58:40
This quiz was very helpful
terevera
2016-12-04 11:40:53
I am a little surprised because during the quiz the correct answer for question 8 (related to reference used by NOAA for depth in navigation charts: MLLW) was not an option, Why????????, that was really weird!!! I was pretty sure about the answer but I was not able to find, so I chose MLW. Check it, please.
IDIAZG
2016-11-28 04:57:35
Satisfactorio, me ha parecido muy fascinante y realmente didáctico he aprendido mucho de esta lección.
me encantaría adentrarme más a la parte técnica de los procedimientos matemáticos de los datos de marea y control por medio de la tecnología GPS.
mike@bom
2016-11-11 00:27:10
I work with tides and sea levels and consequently datums. While tidal datums are well understood Geoids and Ellipsoids are less so.
bouksim
2016-11-08 09:51:32
Interesting lesson for those who do not have prior information about tides
ByDand
2016-11-07 10:40:57
Sheds light on a confusing subject, with practical implications. Very worthwhile.
willsbcad
2016-10-29 16:16:24
Great information on tides.
jimichit
2016-10-27 23:00:46
A good course, in Australia we use different datum and tidal epoch, but the principles are the same
Lima Juliet Charlie
2016-09-25 21:04:30
Informative topics.
eric.white
2016-09-23 16:38:44
This works very well for both introducing people new to CO-OPS as well as a refresher for those who don't use datums on a daily basis. Important information and well done!
JKGUSACE
2016-09-22 07:26:01
Very good lesson on explaining datums.
KTuinaceva
2016-09-21 17:19:20
Firstly the Met Ed lesson was effective for learning,the content was relevant to my work studies,it increased my understanding of the topic, the lesson contain particularly interesting and useful, i would like to see some kind of improvement to this lesson and lastly would recommend this lesson to others
IBavia
2016-09-20 21:39:52
Lesson was interesting and very useful
jonwaggoner
2016-09-20 17:41:04
Good coverage of the basic concepts behind various vertical datums. Could use some coverage of methods for converting between datums (e.g. VERTCON or VDatum).
After completing this lesson, the learner should be able to do the following:
List the three types of vertical datums
Describe the reference surface for each vertical datum
Define the following terms:
Sea surface height
Ocean surface topography
Global mean sea level
Local mean sea level
Relative sea level
Recall the lateral extent of the different vertical datums
Recall the geopotential datums in use (in 2016)
Given a time series of water elevations at a tide gauge, identify the tide type
List the different tidal datums and provide an example of a common application of each one
Define tidal epoch and recall the national tidal datum epoch in 2016
Describe the conditions under which a tidal datum is updated more frequently
Describe the tidal datum information available
sea level, mean sea level, MSL, datum, vertical datum, tides, tidal datum, tidal epoch, local mean sea level, relative sea level, Mean lower low water, MLLW, mean high water, MHW, geoid, ellipsoid, orthometric, sea surface height, global mean sea level, ocean surface topography, dynamic ocean topography, NAVD 88, NGVD 29, National Tidal Datum Epoch, NTDE