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Thread: Topography question

  1. #1
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    Default Topography question

    Howdy folks.

    I have read, and looked around the website, and I had a couple of questions.

    I design fields for irrigation. The problem is, I can't look at the fields. So I get the coordinates for the field, and then I go to G-earth to look at the field.

    Question is, what is the easiest way, and most accurate way to input elevation into my autocad software? I know Earth has data to the foot, and it would be great to get that data into my autocad.

    Is there a hack to do that? If not, does Earth pro have that feature?

    Thanks for the help.

    John

  2. #2

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    You cannot export elevation data from Google Earth. But you can get elevation data online that you should be able to import into AutoCAD. Try http://datagateway.nrcs.usda.gov/
    Matt Fox

  3. #3
    Senior Member tpstigers's Avatar
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    Forkboy2 is right - you cannot extract elevation data from Google Earth. And if you could, it wouldn't be very precise. There is most probably better data freely available to you, depending on where your location of interest is.
    I have an existential map; it has 'you are here' written all over it.

  4. #4
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    Quote Originally Posted by Forkboy2 View Post
    You cannot export elevation data from Google Earth. But you can get elevation data online that you should be able to import into AutoCAD. Try http://datagateway.nrcs.usda.gov/
    Forkboy2: Do you know where to get elevation data for Australia?
    That would help me a lot!
    Thanks

  5. #5

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    Google "SRTM". That elevation data is about 90 meter per pixel, which is probably about the most accurate publicly available elevation data you will find for Australia. I'm not sure if Autocad can import the HGT files directly. If you're willing to pay a consulting fee, I can convert the SRTM data to just about any format you need. I already have all of the SRTM data for the entire Earth.

    I've done some cool maps using the SRTM data, which you can find here.
    http://www.gelib.com/terrain-maps.htm
    Matt Fox

  6. #6
    Senior Member tpstigers's Avatar
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    Quote Originally Posted by asilvao View Post
    Forkboy2: Do you know where to get elevation data for Australia?
    That would help me a lot!
    Thanks
    Check out EarthExplorer (http://edcsns17.cr.usgs.gov/EarthExplorer/). Lots of data provided by the US government, covering the planet (including Australia). It's the same SRTM data, available in a variety of formats (even KML).

    Also, if you want to explore topography more, you should check out 3DEM (a free application available here: http://freegeographytools.com/2009/3...available-here) and MicroDEM (another free application available here: http://www.usna.edu/Users/oceano/pgu...m/microdem.htm). Between the two of them, you should be able to read any format you please and translate it into anything you desire. I use both applications extensively, and I recommend them highly (MicroDEM is the more powerful of the two, but it's also got the steeper learning curve).

    If you're interested in GIS in general, I'd recommend Quantum GIS (http://www.qgis.org/)
    Last edited by tpstigers; 01-08-2011 at 03:08 AM.
    I have an existential map; it has 'you are here' written all over it.

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