As high-precision GNSS horizontal and vertical data becomes less expensive to collect, greater attention must be paid when reconciling vertical datasets. In 2013, I wrote two articles entitled ...

The Indian Ocean Geoid Low (IOGL), a significant gravitational anomaly, has puzzled scientists for decades. Research suggests it formed due to interactions between tectonic plates and mantle plumes ...

Editor’s Note: Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. There is a “gravity hole” in the Indian ...

[UPDATE (April 5, 2011): It turns out some of the descriptions I used below to describe a geoid were not accurate. I refer you to this page at the University of Oklahoma for a good description. I’ve ...

It is found in the depths of Indian Ocean and named as the gravity hole or Indian Ocean geoid low, an anomaly on earth where gravity is said to be weaker, and levels of sea dip by more than 328 feet ...

The Earth’s geoid is the shape the planet would assume if its surface were made of water. Naturally, there’s little dispute over the shape of the geoid over the oceans, where it varies by only 100 ...

When we’re told about newly released satellite images of our Earth, we imagine beautiful swathes of green and blue with the occasional white of swirling storm clouds or snow-topped mountain ranges.

The National Geodetic Survey (NGS) has published a technical report that describes options for how NGS can implement a time-dependent geopotential datum and thus a time-dependent geoid model. My last ...

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 ...

It is one of the most exquisite views we have ever had of the Earth. This colourful new map traces the subtle but all pervasive influence the pull of gravity has across the globe. Known as a geoid, it ...

Scientists have known about the existence of a 'gravity hole' in Indian Ocean for decades but have long been left puzzled as to why it exists. Known officially as the 'Indian Ocean Geoid Low', it ...