谷歌将升级全球海洋地图-英语科普-

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2024年7月15日发(作者：)

谷歌将升级全球海洋地图-英语科普-

谷歌将升级全球海洋地图

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Internet information giant Google updated ocean data in its Google

Earth application this week, reflecting new bathymetry(海洋测深学) data

assembled by Scripps Institution of Oceanography, UC San Diego, NOAA

researchers and many other ocean mapping groups from around the world.

The newest version of Google Earth includes more accurate imagery in

several key areas of ocean using data collected by research cruises over

the past three years.

"The original version of Google Ocean was a newly developed

prototype map that had high resolution but also contained thousands of

blunders(大错) related to the original archived ship data," said David

Sandwell, a Scripps geophysicist. "UCSD undergraduate students spent the

past three years identifying and correcting the blunders as well as

adding all the multibeam echosounder(回声探测器) data archived at the

National Geophysical Data Center in Boulder, Colorado."

"The Google map now matches the map used in the research community,

which makes the Google Earth program much more useful as a tool for

planning cruises to uncharted areas," Sandwell added.

For example, the updated, more precise data corrects a grid-like

artifact

(手工艺品) on the seafloor that was misinterpreted in the popular

press as evidence of the lost city of Atlantis off the coast of North

Africa.

Through several rounds of upgrades, Google Earth now has 15 percent

of the seafloor image derived from shipboard soundings at 1-kilometer

resolution. Previous versions only derived about 10 percent of their

data from ship soundings and the rest from depths predicted by Sandwell

and NOAA researcher Walter Smith using satellite gravity measurements.

The two developed the prediction technique in 1994. The satellite and

sounding data are combined with land topography from the NASA Shuttle

Radar Topography Mission (SRTM) to create a global topography and

bathymetry grid called SRTM30_PLUS.

This new version includes all of the multibeam bathymetry data

collected by U.S. research vessels over the past three decades including

287 Scripps expeditions from research vessels Washington, Melville and

Revelle. UCSD undergraduate student Alexis Shakas processed all the U.S.

multibeam data and then worked with Google researchers on the global

integration.

The next major upgrade to the grid will occur later this year using

a new gravity model having twice the accuracy of previous models. The

new gravity information is being collected by a European Space Agency

satellite called CryoSat that was launched in February 2010.

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