Mean Tide Level (MTL)

=This must never be confused with MSL.
= MTL is defined as the mean of all HWS and LWS over a period of time.
=  It is not (at present) possible to convert simply from MSL to MTL (or vice versa) at any point.
= MTL and MSL will only coincide when tidal curve is a perfect sine curve and this rarely occurs.

DEFINITION OF DATUMS

Mean Sea Level (MSL)

= MSL is the natural reference level of the geoid, and is defined as the average level taken up by the sea along a long period (18.6 years if possible).
= In practice it is obtained from the mean of all tide readings or MSL is the average level taken up by the sea.
= It coincides very nearly with the geoid.
= The accuracy of MSL depends on a long period of tidal observation.
= The best result can be obtained with 18.6 years observation.
= MSL is the best vertical reference level we have and as such is the basic reference level for tides.
= Observed MSL is subject to change due;
· Polar melting or glacial activity.
· Meteorological effects (rain, wind, pressure).
· Short period effects (sea, swell, surges, etc.).
· Tectonics (crustal changes).
· Astronomical effects (changes in MSL due to the combined effect like seasonal meteorological variation).
· Mean of all tide readings over a long period (30 days to 18.6 years).
· Multiple of 25 hourly observations (preferably 3 days to 75 hours).
· Mean of 25 hourly observations (poorer value).

DATUMS

When conducting a survey, the surveyor needs to measure heights and depths above or below certain fixed level, which are referred to as datum’s. The datum to which depths are to be reduced is fundamental to any survey and will contain details of how this is to be established.

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Coordinate Transformation

There are several types coordinate that we use in cadastral survey in world. Nowaday, the cassini coordinate show in the certified plan in cadastral. This coordinate system will exchange to the new coodinate system. That we call GDM2000.. i have a problem about how to convert cassini coordinate to rso coordinate. i hope somebody can solve my problem. I just want to know the formula.that it...


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Survey For Prove the Boundary Line

The old survey for this survey is undertaken at year 1962. But the boundary mark still in the correct position. That why I’m very respect the old surveyor. Because they do the job with quality.The displacement between new-po for the baseline is very good about 20”… I and with other member’s from ‘juruukur semasa’ start this job with traverse. Using satisfactory datum and traverse around the lot while find the boundary mark. But today in afternoon, I feel very tired. Mybe not enough sleep last night… after finish the job, I take some note to refer in feature if I make the mistake. To all member’s , visit my blog if all of you want find some extra knownlegde

UITM LEARNING SUBJECT IN GEOMATIC COURSE

SUG101
COMPUTER APPLICATION I
= learn about programming
= Microsoft excel
= what is computer?

SUG111
INTRODUCTORY SURVEYING
= chain survey
= compass survey
= plantable survey
= introduction make the traverse using thedolite
= bearing and angle

SUG113
ENGINEERING SURVEYING I
= basic principal of EDM
= the wave from total station
= what is lavelling?
= how to perform this practical?
= make the traverse and take the detail around control
= cross set n long set

SUG121
CADASTRAL SURVEYING I
= theory about partition,sub-division,amalgation
= how to prove the datum…
= practical : make a new lot

SUG134
FIELD ASTRONOMY
= study of time around the world
= star
= gerhana bulan dan matahari
= practical: solar observation

SUG201
COMPUTER APPLICATION II
= learn how to using solfware:
1) CDS(civil design n survey)
2) Autocad 2004
= combination autocad n CDS

SUG213
ENGINEERING SURVEYING II
= curve
= setting out
= mine survey
= practical: traverse,make the detail,cross set n long set, and process the data using solfware….

SUG221
CADASTRAL SURVEYING II
= first alienation of survey
= base line
=re-survey
= right of way
=natural boundary
= cadastral processing system
= road reserve
= F2F concept..
=right line
= party wall survey
= practical: sub-division work