The first of a two-part series, this 40-50 minute non-narrated interactive lesson is intended to help professionals with basic science background better understand the Earth’s gravity field and what causes its variations. Of particular interest to earth/physical scientists as well as surveying engineers, this lesson covers Newton’s laws with a focus on Earth’s gravity field as it applies to geodesy. After a review of the basics of Newtonian gravitation and gravity, it explores how density, altitude, and latitude affect gravity.
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gsb12
2020-03-15 20:10:40
Great lesson.
marloih
2019-07-09 05:08:10
Excellent! With precision for the exact handling of descriptions.
kramangielou
2018-10-08 01:43:34
good
fernan942
2018-09-12 14:12:39
Full recommended
rmp3117
2018-09-07 08:30:24
I would recommend this lesson to all geodetic surveyors.
gabrielcp
2018-04-16 13:26:10
There is an error, lambda (ʎ) is not longitude (ⱷ)
gabrielcp
2018-04-16 13:16:17
Very good introduction to the theme. I really recommend it!
alwardi
2018-01-09 02:37:29
it was a great well organize gravity coarse
alwardi
2018-01-09 02:35:49
it was a great well organize gravity coarse
w.wefel
2017-12-22 21:25:15
A good primer on earth's gravity.
donaldrsbr
2017-11-21 13:32:14
na
jngondo
2017-10-04 08:50:31
Good and very educative.
stevemcpra
2017-09-26 09:43:22
Course is great-but could not get exam score(taken twice)or certificate
francisco.medina
2017-09-07 08:58:00
Excellent; with no wasted space. Basic but useful.
jblaisdell
2017-07-04 11:41:20
Good visualization of geodetic and geocentric latitudes and good examples of magnitudes of the various effects on gravity.
coandrei
2017-06-24 07:18:24
A good informative lesson to start with. The visuals and attached exercises support the learning of various concepts. The completion time may be a bit too optimistic and is only for perhaps grasping. Consider at least 2 or 3X more time for going thoroughly over the lesson. Furthermore, please notice that notation of geodetic latitude is 'lambda' instead of 'phi'. In many references, lambda denotes the longitude.
Cryosphere
2017-05-01 15:33:20
Esta leccion es muy importante, es importante sber como funciona el campo gravitatorio terrestre y como se elaboran los mapas, para no equivocarse a la hora de entender un mapa y porque se eliguen unos elipsoides u otros dependiendo de la zona geografica, o como nos afecta la subida del nivel amrinoo, o que cambios importantes se estan produciendo en las masas de hielo o en las corrientes marinas, que nos puedan indicar cambios de ciclos, pro ejemplo el niño, o cambios en el nivel marino
meredithpayne
2017-04-24 13:32:12
A great way to do a quick brush-up on fundamental physical principles governing gravity on Earth.
WHH114
2017-04-24 12:30:05
This was a very informative learning experience and I am going to recommend it to my colleagues.
GPSman
2017-04-21 21:37:49
A poll such as this one should not be called a survey.
JAC
Batuh
2017-04-21 04:43:56
Thanks
prasadraprolu
2017-04-16 08:55:33
very nice
jdcampos
2017-04-16 03:07:32
Very intuitive lesson, easy of undestanding and kind interesting.
dickrichter
2017-04-14 13:31:45
Great course.
peterngreenhalgh@ntlworld.com
2017-04-11 11:17:39
This was great - simple but very effective
499111
2017-04-02 13:43:20
Test questions somewhat vague/confusing due to lack of information in presentation. This led to guessing due to lack of provided content in body of question itself.
diogorau
2017-03-30 11:17:25
I really enjoyed the subject, having no knowledge of geodesy. It was a fascinating lesson and advanced my understanding quite a bit.
terevera
2017-03-29 14:26:08
The topic was explained in a readily and clear way. I enjoyed the exercises illustrating concepts.
PluviAl
2017-03-29 12:43:39
I did not take the lesson, only the pre-test. I answered the above based on the pretest, and how well it worked, and informed, and on the excellent, and generous, products from MetEd. I respond to let you know of the error. I got up in the middle of the night to cool a bag of ice for my back. I left the class because it was cool. Thanks for your help in educating me and your wonderful work.
simonsuniverse
2017-03-29 09:16:27
A very interesting primer on Geodesy.
Uchenna Victor
2017-03-29 09:12:59
The content is awesome and helps to better understanding of Gravity.
idollery
2017-03-28 17:42:44
A straight forward explanation of the science with relevant questions.
A summary which grouping the different effects on gravity (which are discussed) with their relative magnitudes would be useful.
national geodetic survey, geodesy, gravity, gravitation, gravity field, geoid, the geoid, ellipsoid, geopotential, geopotential datum, earth gravitational model, gravity anomalies, geodetic latitude, geocentric latitude, gravity, gravitation, ellipsoid, ellipsoidal earth, vector force, newton, newtonian physics, Newton’s Second Law of Motion, Somigliana-Pizetti equation, apparent force, centrifugal force, universal gravity constant, gravity calculation, gravity variations, earth density, gravity measurement, gravimeter, mass movement