Re: [osg-users] VPB creating earth model with using GTOPO30 data.

[Robert Osfield]

Hi Umit,

On Fri, May 23, 2008 at 7:36 PM, ümit uzun [EMAIL PROTECTED] wrote:
 Sorry for late reply because of my school exams. I have tried gdalinfo 
 E020N90.DEM -mm pattern and result is like this;
...
  Min=-.000 Max=5483.000   Computed Min/Max=1.000,65535.000
  Minimum=-.000, Maximum=5483.000, Mean=-4412.900, StdDev=5088.600
  NoData Value=-

 The result is showing up  NoDataValue problem like your approach. How can I 
 fix this problem, only solution is using gdal_vrt?

Well it has a NoDataValue, which suggests that VPB should be able to
pick on this values and filter them out - this works normally for most
data sets.  I do wonder of GDAL itself in interpolating values that
include the NoDataValue rather than ignoring.

I don't really have any answers though, I'd need to try out the
problem data first hand.

Robert.
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[osg-users] VPB creating earth model with using GTOPO30 data.

[ümit uzun]

Hi Robert,

Sorry for late reply because of my school exams. I have tried gdalinfo 
E020N90.DEM -mm pattern and result is like this;


Driver: EHdr/ESRI .hdr Labelled
Size is 4800, 6000
Coordinate System is:
GEOGCS[WGS 84,
DATUM[WGS_1984,
SPHEROID[WGS 84,6378137,298.257223563,
AUTHORITY[EPSG,7030]],
TOWGS84[0,0,0,0,0,0,0],
AUTHORITY[EPSG,6326]],
PRIMEM[Greenwich,0,
AUTHORITY[EPSG,8901]],
UNIT[degree,0.0174532925199433,
AUTHORITY[EPSG,9108]],
AXIS[Lat,NORTH],
AXIS[Long,EAST],
AUTHORITY[EPSG,4326]]
Origin = (20.004,90.000)
Pixel Size = (0.0083330,-0.0083330)
Corner Coordinates:
Upper Left  (  20.000,  90.000) ( 20d 0'0.00E, 90d 0'0.00N)
Lower Left  (  20.000,  40.000) ( 20d 0'0.00E, 40d 0'0.00N)
Upper Right (  60.000,  90.000) ( 60d 0'0.00E, 90d 0'0.00N)
Lower Right (  60.000,  40.000) ( 60d 0'0.00E, 40d 0'0.00N)
Center  (  40.000,  65.000) ( 40d 0'0.00E, 65d 0'0.00N)
Band 1 Block=4800x1 Type=UInt16, ColorInterp=Undefined
  Min=-.000 Max=5483.000   Computed Min/Max=1.000,65535.000
  Minimum=-.000, Maximum=5483.000, Mean=-4412.900, StdDev=5088.600
  NoData Value=-

The result is showing up  NoDataValue problem like your approach. How can I fix 
this problem, only solution is using gdal_vrt?

Thanks so much.


ÜMİT UZUN


 Date: Fri, 16 May 2008 08:42:48 +0100
 From: [EMAIL PROTECTED]
 To: osg-users@lists.openscenegraph.org
 Subject: Re: [osg-users] VPB: texture banding at all tile levels
 
 HI Umit,
 
 The issue you are seeing is totally unrelated to the one John has
 seen.  The problem you see looks like an issue with the elevation
 data, most likely related to the problems with the NoDataValue.
 However, without the data I can't do any tests to look at it.At
 your end try:
 
   gdalinfo E020N90.DEM -mm
 
 Robert.
 
 
 
 
 
 
 On Thu, May 15, 2008 at 5:46 PM, ümit uzun  wrote:

 Hi Robert;

 I have try to create the earth database like John's;

 osgdem --bluemarble-west -t land_shallow_topo_west.tif --bluemarble-east -t 
 land_shallow_topo_east.tif  --geocentric -o earth/earth.ive --so build.source

 osgdem -s build.source -d E020N90.DEM -d /E020N40.DEM -v 1.4 -l 6

 And the result is http://img127.imageshack.us/my.php?image=earthto6.png Land 
 height relief didn't created, only Sea height relief could be seen. I don't 
 understand why its command created this dirty database. Any thinking about 
 it?

 Thanks so much..


 ÜMİT UZUN
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