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Positional accuracy of the Google Earth terrain model derived from stratigraphic unconformities in the Big Bend region, Texas, USA

机译:由美国德克萨斯州大弯地区的地层不整合面得出的Google Earth地形模型的位置精度

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摘要

The Google Earth terrain model could prove beneficial for extraction of positional data in the future. At present, only an aging independent benchmark study (Potere, D., 2008. Horizontal position accuracy of Google Earth's highresolution imagery archive. Sensors, 8, 7973-7981) provides constraints on positional accuracy for Google Earth imagery. In this investigation, we compared virtually traced positions against high-precision (<1 m) field measurements along three stratigraphic unconformity sub-sections in the Big Bend region to determine current positional accuracy for the Google Earth terrain model. A horizontal position accuracy of 2.64 m RMSE_r was determined for the Google Earth terrain model with mean offset distance being 6.95 m. A vertical position accuracy of 1.63 m RMSE_z with mean offset distance of 2.66 m was also calculated for the terrain model. Results suggest data extracted from the Google Earth terrain model could plausibly be used in future studies. However, we urge caution in using Google Earth data due to limited information disclosures by developers.
机译:Google Earth地形模型可能会证明对将来提取位置数据很有帮助。目前,只有一项老化的独立基准研究(Potere,D.,2008年。GoogleEarth高分辨率影像档案的水平位置精度。Sensors,第8页,7973-7981)对Google Earth影像的位置精度提供了限制。在这项调查中,我们将大弯曲地区的三个地层不整合面子区域中的虚拟追踪位置与高精度(<1 m)实地测量进行了比较,以确定Google Earth地形模型的当前位置精度。对于Google Earth地形模型,确定的水平位置精度为2.64 m RMSE_r,平均偏移距离为6.95 m。对于地形模型,还计算出垂直位置精度为1.63 m RMSE_z,平均偏移距离为2.66 m。结果表明,从Google Earth地形模型提取的数据有可能在未来的研究中使用。但是,由于开发人员披露的信息有限,因此我们在使用Google Earth数据时应谨慎行事。

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