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Forum Bincang Bebas: apa sih DATUM itu?????????????
 
 
 
Topik: apa sih DATUM itu?????????????
Penulis :  arun

(GMT) 04:30:42 Rabu, 27 Mei 2009 
Tanggapan : 3

Dilihat: 4002

Kategori : Bincang Bebas 

halo salam kenal saya yg sangat pendatang baru di dunia navigasi mohom penjelasan buat temen2 yg tahu pengertian DATUM?makasih
 

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Tanggapan

SamDMan, (GMT) 08:07:40 Rabu, 27 Mei 2009)

 
Kalo mau cari sebentar pasti dapet d,
ini dari wiki:

Geodetic systems or geodetic data are used in geodesy, navigation, surveying by cartographers and satellite navigation systems to translate positions indicated on their products to their real position on earth.

The systems are needed because the earth is not a perfect sphere.

Examples of map data are:
WGS 84, 72, 64 and 60 of the World Geodetic System
NAD83, the North American Datum which is very similar to WGS84
NAD27, the older North American Datum, of which NAD83 was basically a readjustment [1]
OSGB36 of the Ordnance Survey of Great Britain
ED50 : the European Datum

The difference in co-ordinates between data is commonly referred to as datum shift. The datum shift between two particular datums can vary from one place to another within one country or region, and can be anything from zero to hundreds of metres (or several kilometres for some remote islands). The North Pole, South Pole and Equator may be assumed to be in different positions on different datums, so True North may be very slightly different. Different datums use different estimates for the precise shape and size of the Earth (reference ellipsoids).

The difference between WGS84 and OSGB36 is up to 140 metres (450 feet), which for some navigational purposes is an insignificant error. For most applications, such as surveying and dive site location for SCUBA divers, 140 metres is an unacceptably large error.

http://en.wikipedia.org/wiki/Map_datum

arun, (GMT) 06:49:02 Senin, 01 Juni 2009)

 
trima kasih banyak atas saran skarang saya dah mengerti arti datum..... skali lagi ma\trima kasih banyak........

alexzz, (GMT) 09:21:17 Kamis, 02 Mei 2019)

 
Thanks for clarifying that for me. It's really helpful.
192.168.0.1

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