what are the unit and source of topo data in matlab?

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Sanaz
Sanaz 2014-6-23
编辑： Ted Shultz 2021-2-23
I want to use the elevation data from topo.mat in matlab. I need some information about it. 1)What is the unit for the elevation data? and 2)where did matlab get the data?

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回答（2 个）

Kimberly
Kimberly 2014-8-30
I had the same question as you!
I don't know if you've gotten an answer yet. The mathworks website says, "National Geophysical Data Center, NOAA US Department of Commerce under data announcement 88-MGG-02."
I did a google search, and here is the website with the relevant information: http://www.ngdc.noaa.gov/mgg/global/etopo5.HTML
Ted Shultz
Ted Shultz 2021-2-23
编辑：Ted Shultz 2021-2-23
As Kimberly said, the "topo" data is from http://www.ngdc.noaa.gov/mgg/global/etopo5.HTML. Their is a newer data set out (https://www.ngdc.noaa.gov/mgg/global/global.html) with better documentation. That data set says the Lat/Lon are WGS 84, and the elevation is meters above MSL for the center of that cell. I assume that is the same for the older data set used in MATLAB as well.
To convert from MSL to ellipsoid height, see this page:
https://www.mathworks.com/help/map/ellipsoid-geoid-and-orthometric-height.html

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