Analisis nilai Zenith Tropospheric Delay (ZTD) menggunakan Data CORS di wilayah Jawa Timur tahun 2015-2018

Mannani, Norma Aji Cemara (2020) Analisis nilai Zenith Tropospheric Delay (ZTD) menggunakan Data CORS di wilayah Jawa Timur tahun 2015-2018. Undergraduate thesis, Institut Teknologi Sepulu Nopember.

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Abstract

Global Navigation Satellite System (GNSS) kini dikembangkan sebagai sistem penginderaan jauh atmosfer melalui perhitungan Zenith Tropospheric Delay (ZTD). Salah satu komponen dalam ZTD adalah Zenith Wet Delay (ZWD). ZWD dipengaruhi oleh kandungan uap air yang menyebabkan sulit untuk dimodelkan karena kandungan uap air tidak tercampur secara baik sehingga bergantung pada wilayah masing-masing. Seiring dengan pengembangan stasiun CORS, maka mendorong dilakukannya penelitian mengenai ZTD dengan data yang kontinyu dan resolusi spasial yang baik karena letak stasiun CORS tersebar merata. Penelitian ini bertujuan menganalisis karakteristik variasi spasial dan temporal dari ZWD di wilayah Jawa Timur. Studi kasus penelitian ini adalah Provinsi Jawa Timur dengan menggunakan 16 stasiun CORS. Selain data CORS, digunakan pula data meteorologi dari empat stasiun milik BMKG di Jawa Timur yang digunakan sebagai data pembanding. Perhitungan nilai ZTD dan ZWD menggunakan perangkat lunak GIPSY 6.4. Nilai ZWD divisualisasikan dengan gridding metode krigging dengan ukuran grid 0,25˚ × 0,25˚ yang kemudian dianalisis secara spasial. Analisis variasi temporal dilakukan berdasarkan rerata tahunan, dekomposisi time series, dan periodogram. Hasil korelasi nilai ZWD dari data CORS dan meteorologi menunjukkan hubungan kuat dengan nilai koefisien korelasi 0,712. Nilai tren rata-rata sebesar 1,628 dengan pola penurunan. Karakteristik variasi spasial dan temporal dari nilai ZWD dipengaruhi beberapa faktor, di antaranya angin monsun Asia dan Australia, fenomena global seperti El Nino dan La Nina, intensitas curah hujan, kondisi meteorologi lokal seperti suhu dan kelembaban, cuaca, dan topografi dari stasiun. ============================================================================ The Global Navigation Satellite System (GNSS) was developed as an atmospheric remote sensing system through the calculation of Zenith Tropospheric Delay (ZTD). One component of ZTD is Zenith Wet Delay (ZWD). ZWD is influenced by the water vapor content which makes it difficult to be modeled because the water vapor content is not well mixed so it depends on conditions in each region. Along with the development of CORS stations, it encourages research on ZTD with continuous data and good spatial resolution because the locations of CORS stations are spread evenly. This study aims to analyze the characteristics of spatial and temporal variations of ZWD in the East Java region. The case study of this research is East Java Province using 16 CORS stations. In addition to CORS data, meteorological data from four stations belonging to BMKG in East Java are used as comparison data. ZTD and ZWD value calculations using GIPSY 6.4 software. ZWD value is visualized by gridding with the kriging method. The size of the grid is 0.25˚x0.25˚. The results of gridding will be analyzed based on spatial conditions. The analysis of temporal variation is based on the annual mean, time series decomposition, and periodogram. ZWD correlation results from CORS and meteorological data show a strong relationship with the correlation coefficient of 0.712. The average trend value of 1,628 with a decreasing pattern. The characteristics of spatial and temporal variations of the ZWD value are influenced by several factors, including Asian and Australian monsoons which cause seasons global phenomena such as El Nino and La Nina, rainfall intensity, local meteorological conditions such as temperature and humidity, weather, and topography of the station.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: CORS, GNSS, variability, ZTD, ZWD, variasi
Subjects: G Geography. Anthropology. Recreation > G Geography (General) > G109.5 Global Positioning System
Divisions: Faculty of Civil Engineering and Planning > Geomatics Engineering > 29202-(S1) Undergraduate Thesis
Depositing User: Norma Aji Cemara
Date Deposited: 12 Aug 2020 02:33
Last Modified: 12 Aug 2020 02:33
URI: https://repository.its.ac.id/id/eprint/77304

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