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

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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?

Answers (2)

Kimberly on 30 Aug 2014
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:

Ted Shultz
Ted Shultz on 23 Feb 2021
Edited: Ted Shultz on 23 Feb 2021
As Kimberly said, the "topo" data is from Their is a newer data set out ( 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:

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