AN INVESTIGATION IN ESTABLISHING THE REFERENCE GEODETIC NETWORK OF IRAN

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CHERAGHI H.; VOSOUGHI B.

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Journal: Year:2008 | Volume:42 | Issue:3 (113) Page(s): 353-360

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Title

AN INVESTIGATION IN ESTABLISHING THE REFERENCE GEODETIC NETWORK OF IRAN

Author(s)

CHERAGHI H. | VOSOUGHI B. | Issue Writer Certificate

Keywords

DYNAMIC CARTESIAN DATUMQ3

GPS OBSERVATION PROCESSINGQ3

IRAN GEODYNAMIC NETWORKQ3

REFERENCE GEODETIC NETWORKSQ3

Abstract

In classical geodesy, the main goal of a geodetic datum was determining the shape and dimension of the earth and defining necessary coordinate system for points of geodetic networks. Earth deformation causes change in position of control points in geodetic networks and consequently change in coordinates of these points in the pre-defined datum. In modern geodesy, the realization of a geodetic datum should be carried out by determining the coordinates of the control points and their temporal changes, as well. Dynamic datum by having stations coordinate and their motion velocity model is a solution for this problem. Iran is located in a very active tectonic region. In such a region, point positions change in time significantly. Therefore, defining a dynamic datum for Iran is very essential. In this research, we have used GPS observations from 5 permanent stations of IRAN GEODYNAMIC NETWORK (Tehran, Mashhad, Tabriz, Hamedan and Ahvaz) and 11 stations of IGS network The time interval of the used GPS data is from the beginning of the year 2004 to the middle of the year 2005. The data has been gathered by the NCC (National Cartographic Center of Iran). The data has been analyzed by the well-known GPS processing program GAMIT/GLOBK. A reference network for Iran, which is connected to ITRF2000 world network, has been established by processing of this GPS data. The coordinate has generated for epoch 2005.409 (the reference date for the new datum of 1 July of 2005). The steps of the process are: 1- Collecting Iran permanent station observation and IGS station and another existing data. 2- Daily processing of stations with GAMIT software Checking output of daily process. 3- Processing all h-files by using GLOBK software and producing coordinate and final velocity and stations time series. The results of this research indicates that Tabriz station with velocity 28.42mm/yr, 44.22mm/yr in latitude and longitude directions has the most velocity and Mashhad station with velocity 10.61mm/yr, and 35.23mm/yr in latitude and longitude directions has the least velocity. In these stations, velocity vectors of the stations are toward east north. According to further result, Hamedan and Tehran stations have the best coordinate precision and Ahvaz station has the least coordinate precision. The reason of this result is stations observation data number. During the selected time interval, Tehran station was almost observed every day, but Ahvaz station was observed less. Comparing the obtained results from local network accuracy relative to regional network, we can declare that establishing a dynamic datum and its realization with a national regional reference network is a proper solution to make us independent of using global reference networks.

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APA: Copy

CHERAGHI, H., & VOSOUGHI, B.. (2008). AN INVESTIGATION IN ESTABLISHING THE REFERENCE GEODETIC NETWORK OF IRAN. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), 42(3 (113)), 353-360. SID. https://sid.ir/paper/14235/en

Vancouver: Copy

CHERAGHI H., VOSOUGHI B.. AN INVESTIGATION IN ESTABLISHING THE REFERENCE GEODETIC NETWORK OF IRAN. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)[Internet]. 2008;42(3 (113)):353-360. Available from: https://sid.ir/paper/14235/en

IEEE: Copy

H. CHERAGHI, and B. VOSOUGHI, “AN INVESTIGATION IN ESTABLISHING THE REFERENCE GEODETIC NETWORK OF IRAN,” JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), vol. 42, no. 3 (113), pp. 353–360, 2008, [Online]. Available: https://sid.ir/paper/14235/en

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