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Almanya Münih Bölgesinde QDaedalus sistemi ile gözlemlenen astrojeodezik çekül sapma verilerinin GGMplus ve EGM2008 ile kestirilen değerlerle karşılaştırılması

Yıl 2020, Cilt: 41 Sayı: 3, 220 - 246, 15.12.2020
https://doi.org/10.17824/yerbilimleri.740141

Öz

Astrojeodezik sistemlerle gözlemlenen astrojeodezik çekül sapma verisi, yeryuvarının gravite alanı ile ilgili önemli bilgiler sağlaması nedeniyle, yerbilimleri alanında, özellikle jeodezi ve jeofizik gibi bilimsel disiplinlerde, yersel, hava ve uydu gravite verilerinin kontrolü ve validasyonunda sıklıkla kullanılmaktadır. Bu çalışmada, Münih bölgesinde yer alan 10 nirengi noktasında astrojeodezik çekül sapma verisi gözlemleyebilmek için total station temelli QDaedalus sisteminden yararlanılmıştır. Gözlemlenen verilerin doğruluğunun ~0.2 yaysaniyesi (″) olduğu saptanmıştır. Yüksek doğruluklu bu veri seti, iki global gravite alan modelinin—Global Gravite Modeli plus (GGMplus) ve Yer Gravite Modeli 2008 (Earth Gravitational Model 2008–EGM2008)—kalitesini değerlendirebilmek için kullanılmıştır. QDaedalus sistemi ile gözlemlenen ve GGMplus modeli ile kestirilen çekül sapma bileşenleri arasındaki farklar, hem Kuzey-Güney (K-G) hem de Doğu-Batı (D-B) bileşenlerinde yaklaşık 0.2″ olmakla beraber, maksimum farklar K-G ve D-B bileşenlerinde sırasıyla ~0.3″ ve ~0.4″ olarak tespit edilmiştir. Sonuçlar EGM2008 modeli için analiz edildiğinde ise, gözlemlenen ve EGM2008 ile kestirilen çekül sapma bileşenleri arasındaki maksimum farkların K-G bileşeninde 0.9″; D-B bileşeninde ise 1.8″ olduğu saptanmıştır. Dolayısıyla, EGM2008 ile kestirilen değerlerin, GGMplus ile kestirilen değerlere göre doğruluğunun daha düşük olduğu görülmüştür. Bu çalışmadan elde edilen sonuçlar, daha önce İstanbul’da QDaedalus gözlemleri ile EGM2008 ve GGMplus modellerinin kıyaslandığı uygulama sonuçlarıyla da karşılaştırılmıştır. Bu makale kapsamında, İstanbul ve Münih’te aynı sistem ve global gravite alan modelleri kullanılarak elde edilen çekül sapma verileri arasındaki farkların sebepleri tartışılarak, GGMplus ile kestirilen çekül sapma veri setinin, hem Münih hem de İstanbul’da daha yüksek doğruluğa sahip olmasının nedenleri açıklanmıştır.

Destekleyen Kurum

TÜBİTAK BİDEB 2214-A

Proje Numarası

1059B141601200

Teşekkür

Münih’te QDaedalus sistemi ile gerçekleştirilen arazi çalışmaları, Alman Akademik değişim Servisi (DAAD) kısa dönem araştırma bursu, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK) BİDEB 2214-A Doktora Sırası Araştırma Bursu (proje no: 1059B141601200; Albayrak ve Hirt, 2018a) ve Münih Teknik Üniversitesi Astronomik ve Fiziksel Jeodezi Enstitüsü tarafından desteklenmiştir. Bu veri setinin EGM2008 (Pavlis vd. 2012) ve GGMplus (Hirt vd. 2013) ile karşılaştırılması ve yapılan çalışmanın makaleye dönüştürülmesi sürecindeki destekleri için ise TÜBİTAK BİDEB 2219 Doktora Sonrası Araştırma Burs Programı’na (proje no: 1059B192000149) ve İsviçre La Haute Ecole d'Ingénierie et de Gestion du Canton de Vaud (HEIG-VD) Yersel Mühendislik Enstitüsü’ne teşekkür ederiz. Ayrıca bu çalışmayı inceleyen, zaman ve emek harcayarak yayının bilimsel kalitesinin artmasına yardımcı olan Dr. Elmas Sinem İnce ve gizli hakeme katkılarından dolayı teşekkürlerimizi sunarız. Şekil 3’teki harita QGIS kullanılarak çizdirilmiştir (OpenStreetMap, 2019).

Kaynakça

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Comparison of Observed Astrogeodetic Vertical Deflection Data Using QDaedalus System with the GGMplus- and EGM2008-predicted values in the Munich Region, Germany

Yıl 2020, Cilt: 41 Sayı: 3, 220 - 246, 15.12.2020
https://doi.org/10.17824/yerbilimleri.740141

Öz

Astrogeodetic vertical deflection (VD) data observed by astrogeodetic systems, which provide important information about Earth’s gravity field, are frequently used in the Earth Science disciplines, including geodesy and geophysics, to control and validate terrestrial, airborne and satellite gravity data. In this study, the total station-based QDaedalus system was used to observe astrogeodetic VD data at 10 benchmarks in the Munich region. The accuracy of these data is ~0.2 arcseconds (″). This high accuracy dataset was used to assess the quality of two global gravity field models—Global Gravitation Model Plus (GGMplus) and Earth Gravitational Model 2008 (EGM2008). The differences between the observed by QDaedalus and GGMplus-predicted VD data were ~0.2″ for both the North-South (N-S) and East-West (E-W) VD components, and reached a maximum of ~0.3″ and ~0.4″ for the N-S and E-W components, respectively. However, the maximum differences between the observed and EGM2008-predicted VD data for the N-S and E-W directions were 0.9″ and 1.8″, respectively. Thus, we found that the EGM2008-predicted values are less accurate than the predicted GGMplus values. The results of this study were compared with the results from a prior QDaedalus, and EGM2008 and GGMplus comparison study in Istanbul. In this article, we discuss the differences between the VD data obtained using the same QDaedalus system and global gravity field models in Istanbul and Munich, and explain the reasons for the higher accuracy of the VD data set predicted by GGMplus in both Munich and Istanbul.

Proje Numarası

1059B141601200

Kaynakça

  • Abele, M., Balodis, J., Janpaule, I., Lasmane, I., Rubans, A., Zariņš, A., 2012. Digital zenith camera for vertical deflection determination. Geodesy and Cartography, 38(4),123–129. https://doi.org/10.3846/20296991.2012.755324.
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  • Guillaume, S., Bürki, B., Griffet, S., Durand, H.M., 2012. QDaedalus: Augmentation of total stations by CCD sensor for automated contactless high-precision metrology. In FIG working Week.
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  • Hirt, C., 2006. Monitoring and analysis of anomalous refraction using a digital zenith camera system. Astronomy & Astrophysics 459(1):283-90. https://doi.org/10.1051/0004-6361:20065485.
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  • Hirt, C., Flury, J., 2008. Astronomical–topographic levelling using high-precision astrogeodetic vertical deflections and digital terrain model data. Journal of Geodesy 82(4–5):231–48. https://doi.org/10.1007/s00190-007-0173-x.
  • Hirt, C., Seeber, G., 2008. Accuracy analysis of vertical deflection data observed with the Hannover Digital Zenith Camera System TZK2-D. Journal of Geodesy 82(6):347-56. https://doi.org/10.1007/s00190-007-0184-7.
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  • Hirt, C., Bürki, B., Somieski, A., Seeber, G., 2010a. Modern determination of vertical deflections using digital zenith cameras. Journal of Surveying Engineering 136 (1): 1–12. https://ascelibrary.org/doi/pdf/10.1061/%28ASCE%29SU.1943-5428.0000009.
  • Hirt, C., Marti, U., Bürki, B., Featherstone, W.E., 2010b. Assessment of EGM2008 in Europe using accurate astrogeodetic vertical deflections and omission error estimates from SRTM/DTM2006. 0 residual terrain model data. Journal of Geophysical Research: Solid Earth 115(B10).
  • Hirt, C., Guillaume, S., Wisbar, A., Bürki, B., Sternberg, H., 2010c. Monitoring of the refraction coefficient in the lower atmosphere using a controlled setup of simultaneous reciprocal vertical angle measurements. Journal of Geophysical Research: Atmospheres 115(D21). https://doi.org/10.1029/2010JD014067.
  • Hirt, C., Schmitz, M., Feldmann-Westendorff, U., Wübbena, G., Jahn, C.H., Seeber, G., 2011. Mutual validation of GNSS height measurements and high-precision geometric-astronomical leveling. GPS Solutions 15(2):149-59.
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  • Hirt, C., Wildermann, E., 2018. Reactivation of the Venezuelan vertical deflection data set from classical astrogeodetic observations. Journal of South American Earth Sciences 85: 97-107. https://doi.org/10.1016/j.jsames.2018.05.003.
  • Ince, E.S., Barthelmes, F., Reißland, S., Elger, K., Förste, C., Flechtner, F., Schuh, H., 2019. ICGEM–15 years of successful collection and distribution of global gravitational models, associated services, and future plans. Earth System Science Data 11(2).
  • Jekeli, C., 1999. An analysis of vertical deflections derived from high-degree spherical harmonic models. Journal of Geodesy 73(1): 10–22.
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  • Liang, W., Xu, X., Li, J., Zhu, G., 2018. The determination of an ultra-high gravity field model SGG-UGM-1 by combining EGM2008 gravity anomaly and GOCE observation data, Acta Geodaetica et Cartographica Sinica, 47 (4): 425–434, https://doi.org/10.11947/j.AGCS.2018.20170269.
  • Morozova, K., Jäger, R., Balodis, J., Silabriedis, G., Kaminskis, J., Kalinka, M., Balodis, K., Mitrofanovs, I., 2019. Preliminary Results on Quasi-Geoid for Western Part of Latvia Using Digital-Zenith Camera and DFHRS V. 4.3 Software. Geophysica. 54(1):61-8.
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  • Pavlis, N.K., Holmes, S.A., Kenyon, S.C., Factor, J.K., 2012. The development and evaluation of the Earth Gravitational Model 2008 (EGM2008). Journal of geophysical research: solid earth 117(B4). https://doi.org/10.1029/2011JB008916.
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  • Zariņš, A., Rubans, A., Silabriedis, G., 2016. Digital zenith camera of the University of Latvia. Geodesy and Cartography 42(4):129-35. http://dx.doi.org/10.3846/20296991.2016.1268434.
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Toplam 77 adet kaynakça vardır.

Ayrıntılar

Birincil Dil Türkçe
Konular Mühendislik
Bölüm Makaleler
Yazarlar

Müge Albayrak 0000-0001-6705-4044

Emel Zeray Öztürk 0000-0002-7498-5258

İbrahim Öztuğ Bildirici 0000-0001-7717-586X

Christian Hirt 0000-0002-3176-7939

Sébastien Guillaume Bu kişi benim 0000-0002-0831-7833

Ck Shum Bu kişi benim 0000-0001-9378-4067

Proje Numarası 1059B141601200
Yayımlanma Tarihi 15 Aralık 2020
Gönderilme Tarihi 1 Haziran 2020
Kabul Tarihi 6 Ekim 2020
Yayımlandığı Sayı Yıl 2020 Cilt: 41 Sayı: 3

Kaynak Göster

EndNote Albayrak M, Zeray Öztürk E, Bildirici İÖ, Hirt C, Guillaume S, Shum C (01 Aralık 2020) Almanya Münih Bölgesinde QDaedalus sistemi ile gözlemlenen astrojeodezik çekül sapma verilerinin GGMplus ve EGM2008 ile kestirilen değerlerle karşılaştırılması. Yerbilimleri 41 3 220–246.