No audio available for this content. My last column highlighted an ArcGIS web application that incorporates various datasets and data layers to assist surveyors planning vertical control surveys. On ...
Figure 1: Relationship between the geoid and seismic tomography. The best-fitting model (Fig. 2a) was found by a systematic parameter search (Supplementary Figs 1–5). The eastern hemisphere geoid low ...
No audio available for this content. This column discusses the results of the National Geodetic Survey (NGS) beta hybrid Geoid18 model and the differences between the beta model and the official ...
What shape is planet Earth? It's a sphere, right? Well not exactly. OK, so it's a bit flatter at the poles and bulges in the middle. An oblate spheroid? That's a better approximation, but still not ...
Credit: International Centre for Global Earth Models (ICGEM) / E. S., Barthelmes, F., Reißland, S., Elger, Like all scientific mysteries, the Indian Ocean geoid low (IOGL) — also known as the Indian ...
AMAZING GRACE Data collected by the twin Gravity Recovery and Climate Experiment (Grace) satellites have produced the most accurate map yet of Earth's geoid, or gravity field, even before the ...
SOME time ago in a communication, I presented a model which speculated on the origin of the D″ layer between the mantle and the core of the Earth 1. This layer is believed to be predominantly a molten ...
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