How to check the kml file elevation values with the readgeotable

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주영 2024-8-23，4:45

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2147414-how-to-check-the-kml-file-elevation-values-with-the-readgeotable

回答： Angelo Yeo 2024-8-23，5:23

I would like to check the kml file z value with the readgeotable and apply it to build the hd map

https://kr.mathworks.com/help/roadrunner/ug/build-test-track-3d-scene-in-roadrunner-using-roadrunner-hd-map.htm

In the example above, I am importing elevation values to the GeoTiff file, is there a way to get elevation values directly from the kml file?

Do I have to use GeoTiff?

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Answer 1

Angelo Yeo 2024-8-23，5:23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2147414-how-to-check-the-kml-file-elevation-values-with-the-readgeotable#answer_1503859

在 MATLAB Online 中打开

KML_Samples.zip

readgeotable does not support reading elevation data. One workaround is to change extension from "kml" to "xml" and use readstruct.

unzip("KML_Samples.zip");
copyfile("KML_Samples.kml", "KML_Samples.xml"); %changing extension from kml to xml
T = readgeotable("KML_Samples.kml");
T(1,:)
ans = 1x3 table
             Shape                    Name                                                    Description                                          
    _______________________    __________________    ______________________________________________________________________________________________

    (37.4223°N, 122.0822°W)    "Simple placemark"    "Attached to the ground. Intelligently places itself at the height of the underlying terrain."
data = readstruct("KML_Samples.xml");
data.Document.Folder(1).Placemark(1).name
ans = "Simple placemark"
data.Document.Folder(1).Placemark(1).description
ans = 
    "Attached to the ground. Intelligently places itself at the
               height of the underlying terrain."
data.Document.Folder(1).Placemark(1).Point % 37.4223'N, 122.0822' W
ans = struct with fields:
    coordinates: "-122.0822035425683,37.42228990140251,0"