ÜMİT UZUN
________________________________
> Date: Wed, 13 Feb 2008 18:40:37 -0800
> From: [EMAIL PROTECTED]
> To: [email protected]
> Subject: Re: [osg-users] how to read GeoTIFF files using osgdem?
>
> Hi Umit,
>
> Do you know if osgdem actually look at any of the .prj, .aux, .rrd at all or
> is it only looking
> at the .tif file?
>
> Also, do you know if we have two GeoTIFFs of one big patch (but low
> resolution) and one smaller patch
> (but high res) of the same area, we can use osgdem to generate an osga DEM
> file with high res for the area
> where we have high res and low res for area we have low res, eg using:
>
> osgdem -l 8 -d DEM_1m_landArea100x100m.tif -d DEM_10m_landArea4000x4000m.tif
> -o test.ive -a test.osga
>
>
>
>
> Yes I understand you. You should look at LOD (Level of Detail) method.
> osgviewer supporting this feature automatically. and you can't use different
> resolution elevation images in same terrain. You should use same range of
> resolution both of elevation and texture images. If you want to LOD
> processing by this way you don't need two different images. Choose high
> resolution and small patches and use them in osgdem -d 1.tif -d 2.tif . . . .
> .
>
>
>
> I didn't mean that the 2 patches are of the same area. The
> DEM_10m_landArea4000x4000m.tif would cover a bigger area 4 km by 4 km at 10
> meter resolution, and the DEM_1m_landArea100x100m.tif would cover a smaller
> area of the DEM_10m_landArea4000x4000m.tif but at a higher resolution. The
> reason for 2 tif files at different resolution is that we don't want the osga
> DEM to have high resolution for areas we are not interested in when we are
> higher up; osgviewer does this automatically but we don't want to have a
> large osga DEM file.
Ok your high resolution image is small and you want to generate a scene like a
google earth. When you get closer the target high resoluted patches within the
lower resolution large image, you would to see more detailed part instead of
lower resolution images at intersected areas on scene!
-d parameteres could be one more time in osgdem command like a -t. I haven't
try your thinking action yet. But I will try and if I success I will return you.
>
>
> Where did you get the images(DEM_1m_landArea100x100m.tif) Ling ?
>
>
> I don't have it yet. USGS will generate them for us but I haven't figure out
> if osgdem can handle them. Actually, we were thinking of asking for
> DEM_1m_landArea4000x4000m.tif and DEM_10m_landArea40000x40000m.tif instead of
> what I said above, so you see that's alot of data processing.
>
> Thanks Umit,
>
> Linh
>
>
>
> ÜMİT UZUN
>
> ----------------------------------------
>
>
> Date: Tue, 12 Feb 2008 18:42:38 -0800
> From: [EMAIL PROTECTED]
> To: [email protected]
> Subject: [osg-users] how to read GeoTIFF files using osgdem?
>
> Hi,
>
> this is my first time trying to use osgdem on a GeoTIFF file and I
> wasn't successful in viewing the
> generated osga file. The data (from
> http://webgis.wr.usgs.gov/ftphirise/index.jsp) look like this:
>
> % ls DEM_1m_VictoriaCrater*
> DEM_1m_VictoriaCrater.asc.gz DEM_1m_VictoriaCrater.rrd
> DEM_1m_VictoriaCrater.aux DEM_1m_VictoriaCrater.tif
> DEM_1m_VictoriaCrater.prj
>
> % cat DEM_1m_VictoriaCrater.prj
>
> PROJCS["Plate_Carree",GEOGCS["EQUIRECTANGULAR_CYLINDRICAL_MARS",DATUM["D_MARS",SPHEROID["MARS",3396190,0]],PRIMEM["Reference_Meridian",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Plate_Carree"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",180],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["Meter",1]]
>
> I then use osgdem command:
>
> % osgdem -l 2 -d DEM_1m_VictoriaCrater.tif -o test.ive -a test.osga
>
> % osgviewer test.osga
>
> But I didn't see anything when osgviewer first came up, but I know
> something is there because when
> I spin it, I see something spin by really fast. My question are:
>
> 1. Is the "-d DEM_1m_VictoriaCrater.tif" argument to osgdem all I need
> for a GeoTIFF file?
>
> 2. Is there a way for osgviewer to put the object in the center so I can
> see it or do
> I have to ask the USGS to generate the GeoTIFF DEM that has the DEM
> in the center so I can see?
>
> Thank you very much,
>
> Linh
>
>
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