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All Journal REKA GEOMATIKA Indonesian Journal of Geospatial JURNAL ILMIAH GEOMATIKA MAJALAH ILMIAH GLOBE
Kosasih Prijatna, Kosasih
ITB
Earth & Planetary Sciences Education Mathematics

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Journal : Indonesian Journal of Geospatial

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Temporal Variation Analysis From Troposphere Delay Using GPS (Study: Bandung, Indonesia) Pradipta, Dhota; Kuntjoro, Wedyanto; Prijatna, Kosasih
Indonesian Journal of Geospatial Vol 1, No 1 (2012)
Publisher : Indonesian Journal of Geospatial

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Abstract.Tropospheric delay is the amount of distortion caused by the deceleration of satellite’s signal propagation due to the influence of troposphere. The value of this delay is certain effect of elevation angle that is called the slant delay. In the processing of GPS signals correction, the value of slant delay will be converted using a mapping function to the measured value of the zenith delay which became known as the Zenith Total Delya (ZTD). Zenith value is an accumulated value of the tropospheric delay along the signal’s path at the zenith direction. The value of ZTD can be determined by GPS technique. In Geodesy, ZTD is a nuisance parameter, but for meteorology, it is a parameter of interest, which causes from variability of the atmospheric constituens. The section of ZTD, i.e. Zenith Wet Delay (ZWD), could be derived by substracting Zenith hydrostatic Delay (ZHD) component from ZTD. By surface temperature readings at the GPS receiver, the retrieved ZWD can then be transformed with additional uncertainty into an estimate of the Precipitable Water Vapor (PWV). The aim of this research is to study temporal behavior of PWV at ITB campus, as it is revealed from GPS measurements. According to the research that has been conducted, we obtained some results, i.e. The data quality and strategy which were used in processing could affect the result, In particular, we found that, within 20 minutes, maximum and minimum PWV values could reach 85.2 mmand 6.4 mm, respectively. It may indicate that the atmosphere above the studied are varies highly. Temporal condition in observation point that appears in result such as at 12.00 – 18.00 WIB often shows significant irregular anomalies of PWV that influenced local area observation. Keywords: GPS, PWV, temporal analysis, ZTD. 
Steric And Eustatik Effect Contributions To Sea Level Change Based On Altimetry Satellite Argo And Grace Satellite Data Within 1992-2012 Period (The Study Area: The Western Pacific Ocean) Hartanto, Prayudha; Lestari Nurmaulia, Sella; Prijatna, Kosasih
Indonesian Journal of Geospatial Vol 2, No 1 (2013)
Publisher : Indonesian Journal of Geospatial

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Abstract. The change of sea level in the western Pasific Ocean is one of the biggest change in the world. This is caused by steric and eustatic factors. In the period of 1992-2012, the total change of sea level in this area based on the Topex/Poseidon satellite data, Jason 1 and Jason 2, was 6. 982 ± 3.493 mm/year. Based on the temperature and salinity from Argo floats for the period 2000 – 2013,  the obtained high streic changes in sea level in the region is about 14.352 ± 13.002 mm/year. The result is a based on high steric sea level relative to 900 dbar pressure. To find the rise of eustatic sea level that caused by the changes in ocean mass, linear regression performed on the data Equivalent Water Thickness (EWT) of monthly GRACE satellites in the period January 2004 to April 2013. The magnitude of the linear trend EWT changes in this area is -0.4026 ± 0.1073 mm/year. This study concludes that the correlation between EWT and the SLA value is more significant than the correlation between high steric sea level and SLA. But further investigation is needed to determine the factor that contributes more to changes of sea level in the study area. This occurs due to the presence of still considerable correlation between the high steric sea level and ocean mass which is the independent variable in the equation of total sea level . To minimize these correlations , observations required high steric and ocean mass with a longer time span. Keywords : The change of sea level, steric, eustatic, the western Pasific Ocean, linear trend 
Co-Authors Dhota Pradipta, Dhota irwan meilano Joni Efendi, Joni Muhamad, Norman Arif Nurmaulita, Sella Lestari Pahlevi, Arisauna Prayudha Hartanto, Prayudha Sadarviana, Vera Sarsito, Dina A. Sella Lestari Nurmaulia, Sella Variandy, Erfan D. Wedyanto Kuntjoro Widy Putra, Widy Wijaya, Dudy Darmawan