Compass Navigation Satellite
March 16, 2009 by airianto
Filed under COMPASS, GNSS, Geomatics Science
Compass Satellite
The Compass system (also known as Beidou-2, BD2) is a project by China to develop an independent global satellite navigation system. Compass is not an extension to the previously deployed Beidou-1, but a new GNSS system similar in principle to GPS and Galileo.
The new system will be a constellation of 35 satellites, which include 5 geostationary orbit (GEO) satellites and 30 medium Earth orbit (MEO) satellites, that will offer complete coverage of the globe. The ranging signals are based on the CDMA principle and have complex structure typical to Galileo or modernized GPS. Similarly to the other GNSS, there will be two levels of positioning service: open and restricted (military). The public service shall be available globally to general users. When all the currently planned GNSS systems are deployed, the users will benefit from the use of a total constellation of 75+ satellites, which will significantly improve all the aspects of positioning, especially availability of the signals in so-called “urban canyons”. The general designer of Compass navigation system is Sun Jiadong, who is also the general designer of its predecessor, Beidou navigation system.
Low Latitude Troposphere: A Preliminary Study Using GPS CORS Data in South East Asia
January 1, 2009 by airianto
Filed under GPS, Geomatics Science
Hot and wet conditions in the equatorial or low latitude region degrade satellite positioning accuracy noticeably. The degradation is related to the strong tropospheric effect, especially the wet component which is approximately proportional to the content of water vapor in the troposphere and thus makes satellite positioning more challenging in this region.
Despite the efforts to achieve better understanding of the signal delay in the low latitude troposphere, much more still remains to be improved.
Google Mengontrak GeoEye-1
September 9, 2008 by airianto
Filed under Geomatics Science, Remote Sensing
GeoEye Satellite
Google mendapatkan hadiah ulang tahun yang ke-10 berupa peluncuran satelit yang bernama GeoEye-1. Peluncuran tersebut hanya berselang sehari menjelang ulang tahun Google. Di harapkan dengan di luncurkan GeoEye-1, Google dapat menambahkan data-data peta satelit dari seluruh dunia. Satelit GeoEye-1 diluncurkan dengan menumpang roket Delta II di tempat peluncuran Vandenberg Air Force Base.
What Are LIDAR Data?
May 15, 2008 by airianto
Filed under Geomatics Science, LIDAR
www.csc.noaa.gov
How LIDAR Data Are Collected
Dusun Kemit Pada Google Map / Foto Satelit
May 15, 2008 by airianto
Filed under Geomatics Science, Remote Sensing
