Migel, You have the corner coordinates. Now you need to know the pixel value at a particular position. You can calculate the pixel value from the projection coordinates using the affine transformation coordinates. You can get the these coordinates using GDALDataset::GetGeoTransform() method. Knowing the pixel/line information, you can read the pixel value using GDALDataset::RasterIO().
You can check out the code [1] of the gdallocationinfo utility [2]. [1]: http://trac.osgeo.org/gdal/browser/trunk/gdal/apps/gdallocationinfo.cpp [2]: http://www.gdal.org/gdallocationinfo.html On Fri, Jul 8, 2011 at 7:15 PM, migelanjel <edarel...@gmail.com> wrote: > Hello there! > First let me you that i'm quite new in this, so if there's anything that > you > may is basic, please let me know anyway, cause to me it may be the puzzle > piece i'm missing. > > So, here's what i need to do. I have a DTED file (dt2), and i'm trying to > get the elevation data to map it over a jpg image, and show it in the > screen > so i can know the elevation of the point the mouse is over in any moment. > I've loaded the DTED file, and i've been able to read the coordinates of > the > corners of te raster band, but i don't if i can get the elevation data in a > numeric way. I've been reading the doc in the GDAL website but all i could > find about this was "How to draw the data to images". > > Could anyone tell me how to get the numeric elevation data? > > I'm using the C# inteface (because i'll be using XNA to do all the > drawing), > but i can understand C, and a little bit of C++ too, so don't worry about > that. > > Thanks a lot for reading this! > > -- > View this message in context: > http://osgeo-org.1803224.n2.nabble.com/GDAL-Newbie-Get-Height-from-a-DTED-tp6562549p6562549.html > Sent from the GDAL - Dev mailing list archive at Nabble.com. > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Best regards, Chaitanya kumar CH. +91-9494447584 17.2416N 80.1426E
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