Testing Airborne Gravity Data in the Large-Scale Area of Italy and Adjacent Seas
Testing Airborne Gravity Data in the Large-Scale Area of Italy and Adjacent Seas
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DOI：
10.1007/1345_2015_45
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
R. Barzaghi;A. Albertella;D. Carrion;F. Barthelmes;S. Petrovic;M. Scheinert
中科院分区：
文献类型：
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作者：
R. Barzaghi;A. Albertella;D. Carrion;F. Barthelmes;S. Petrovic;M. Scheinert
2012年，GEOHALO飞行使命使用新的德国研究飞机HALO进行。勘测区覆盖意大利的中南部，大致从北纬36°到北纬44°。在这一地区，对西北至东南方向的七条主要轨道进行了勘测，这些轨道的间距约为40公里，高度为3，500米，并辅之以高度为10，000米的第八条轨道。在大地测量-地球物理设备中，GEOHALO携带了两台重力仪。本文将重点介绍GFZ仪器，即CHEKAN-AM重力仪。本研究的目的是确定观测重力数据的光谱特性和精度水平。与意大利地面数据预测重力异常的比较。从这些地面数据导出的被测区域的重力场被传播到航空重力测量测量点，并与观测到的重力异常进行比较。向上延拓使用移除-恢复方法和配置。高分辨率的全球地球重力场模式与观测数据进行了比较。重力残差的统计表明，测量数据与重力预测值在2-3 mGal标准差水平上拟合，达到了较好的标准。还进行了跟踪分析，以检查观测重力和预测重力之间可能存在的局部差异。
In 2012 the GEOHALO flight mission was carried out using the new German research aircraft HALO. The surveyed zone covers the Central-South part of Italy, roughly from latitude 36°N to 44°N. In this area, seven main tracks NW to SE were surveyed having a spacing of about 40 km and an altitude of 3,500 m, complemented by an eighth track in an altitude of 10,000 m. Four perpendicular cross tracks were also added.Amongst the geodetic-geophysical equipment GEOHALO carried two gravimeters. In this paper we will focus on the GFZ instrument, a CHEKAN-AM gravimeter. The present investigation aims at defining the spectral properties and the level of precision of the observed gravity data. Comparisons with gravity anomalies predicted from Italian ground data are presented. The gravity field in the surveyed area as derived from these ground data is propagated to the aerogravimetry survey points and compared to the observed gravity anomalies. Upward continuation is performed using the remove-restore approach and collocation. High-resolution global geopotential models are compared with the observed data as well. The statistics of the gravity residuals show that the survey data fit the predicted gravity at 2–3 mGal standard deviation level which proves that a good standard has been reached. A trackwise analysis is also performed to check for possible local discrepancies between observed and predicted gravity.