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How to change Geotiffs from south-projection to north-projection

Discussion in 'FSX terrain' started by andrewlsummer, 6 Nov 2011.

  1. andrewlsummer

    andrewlsummer

    Joined:
    6 Nov 2011
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    Country:
    australia
    If I get an elevation geotiff from nasa java apps it is south-to-north projected.
    What are the free utilities to change a south projection (wgs84 format) geotiff to north projection?

    At the moment when I import elevation data from my geotiffs its upside down!
    Also I tried doing this in global mapper 10 but I completely failed.
    Does anyone have instructions for that?
    Thanks so much for any help!
  2. arno

    arno Administrator Staff Member FSDevConf team Resource contributor

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    Hi,

    I am not sure what you mean. I am not really aware of up-side-down projections or so. What project does your GeoTIFF files use? Maybe you can post some more information about it?
  3. LCSims

    LCSims

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    He's posted the same question at the PTSim SBuilderX forum, even though SBX does nothing with mesh in FSX. :confused:

    It appears to be Aster Gdem, which is in a ready-to-compile format for FSX and is Lat/Lon'd for a location south of the equator and in the eastern hemisphere. Absent better information, it appears to be good source. He's gotten a response relative to the INF file used, so that may hold the key??
  4. hcornea

    hcornea Resource contributor

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    Sounds like a minus sign gone astray somewhere.

    I was not aware there was a "North and a South deparate WGS84 Geodetic projection"

    ... but I'm all ears.
  5. rhumbaflappy

    rhumbaflappy Moderator Staff Member Resource contributor

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    Without having the original files, it's impossible to see what the problem is. The files could be zipped and attached for us to see.


    There are also a multitude of file sharing sites available for free on the web. If the files are too large to attach here, I suggest Andrew just upload the files to one of these sites, and give us the links.

    I find it hard to believe a NASA DEM file would be vertically flipped.

    Dick

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