Hi Umit,
ümit uzun wrote:
Hi Linh,
1. Reply : if you use geotiff image (which meaning georeferenced tiff) you have to use like this command :
osgdem -t sample.tif -d sample.tif -l 2 -v 0.08 -o result.ive -a result.osga
I thought the GeoTIFF would have the scaling info embeded in it since it
knows the x and y spacings, I thought
it would know the height as well? But I guess I will have to ask them
for what the scaling is then because usually
I wouldn't know what it is.
In this command you can change the -v parameters value between 1.0 <= -v <= 0.0
I think you would know why we use -l parameteres and value ranges.
To get geotiff image you can use;
http://geoengine.nga.mil/geospatial/SW_TOOLS/NIMAMUSE/webinter/rast_roam.html
or http://seamless.usgs.gov/
And I think you only want to create your terrain you should look at
http://www.palomino3d.org/pal/openscenegraph/ site.
But I can't understand your second question. If you want to make your terrain visible
when you run "osgviewer sample.osga" you will be seeing when you create your
terrain by first question's reply.
I guess maybe the terrain they gave me has a problem because when I ran
it like you suggested
it seg fault when I use -t option on the tif file.
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
Thank you Umit,
Linh
If you have any problem you can ask Linh.Good Luck..
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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