Timeline plot of GPS (Latitude and Longitude) data - Plot GPS overtime.

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Frederick Awuah-Gyasi 2022-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/1832503-timeline-plot-of-gps-latitude-and-longitude-data-plot-gps-overtime

评论： dpb 2022-10-21

采纳的回答： dpb

In table A i do have Year, Month, Day, Hour, Minute, Sec, Latitude, Longitude, Altitude.

I have a plot of the gps coordinates using

geoscatter(table_A.Latitude,table_A.Longitude,4)

Now I want to plot the coordinates over time. any help?

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Answer 1

dpb 2022-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/1832503-timeline-plot-of-gps-latitude-and-longitude-data-plot-gps-overtime#answer_1080753

在 MATLAB Online 中打开

tT.Time=datetime(tT.Year, tT.Month, tT.Day, tT.Hour, tT.Minute, tT.Sec);
plot(tT.Time, tT{:,{'Latitude', 'Longitude', 'Altitude'}})

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Frederick Awuah-Gyasi 2022-10-21

Screen Shot 2022-10-21 at 12.51.10 PM.png

@dpb Thanks for the code. What I plotted is showing in the attachment. Canl you please help me interprete it. Especially the Y axis. thank you.

dpb 2022-10-21

在 MATLAB Online 中打开

Try

tT.Time=datetime(tT.Year, tT.Month, tT.Day, tT.Hour, tT.Minute, tT.Sec);
plot(tT.Time, tT{:,{'Latitude', 'Longitude'}})
legend({'Latitude', 'Longitude'})
ylabel('Coordinates')
yyaxis right
plot(tT.Time, tT.Altitude)
ylabel('Altutude')

and it should all become clear... :)

The scale difference between the coordinates and the altitude on the same axes makes for strange bedfellows so split the altitude off onto its own axes.

It would appear the data are for a geosynchronous orbit; the position doesn't appear to change coordinates at all; the altitude seems pretty much a constant with some spikes (noise maybe???). The one extremely large spike surely seems anomalous, but knowing nothing about what the data are, it may be real or, again, bad data.

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