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Re: More on WCS and THREDDS 3.16.36

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  • Subject: Re: More on WCS and THREDDS 3.16.36
  • Date: Wed, 18 Jun 2008 13:17:11 -0700
Hi John:
That fixed the problem of generating the GeoTIFF. If you remember the genesis of this, Yuan Ho made changes to GeotiffWrite that seemed to give improved GeoTIFF's, and this was incorporated into THREDDS 3.16.36. Try these two URL's:
http://las.pfeg.noaa.gov:8082/thredds/wcs/satellite/BA/ssta/8day? request=GetCoverage&version=1.0.0&service=WCS&format=GeoTIFF&coverage=BA ssta&Vertical=.0&time=2008-06-13T00:00:00Z&bbox=220,20,250,50
http://las.pfeg.noaa.gov:8082/thredds/wcs/satellite/BA/ssta/8day? request=GetCoverage&version=1.0.0&service=WCS&format=GeoTIFFfloat &coverage=BAssta&Vertical=. 0&time=2008-06-13T00:00:00Z&bbox=220,20,250,50
Attached also is an image generated from Ferret from the same server from the same file(s) using OPeNDAP. So the problem we are still facing is the GeoTIFF sampling/generation still seems off - we ultimately may need to ship 32 bit GeoTIIFS to the HAB program to be used in HAB forecasting. 

Thanks.

-Roy


On Jun 18, 2008, at 12:06 PM, John Caron wrote:


aha!
I think the problem is that the tomcat user (however tomcat is started) doesnt have write permission in the WCS cache directory: 

      File dir = new File( getDiskCache().getRootDirectory());
File tifFile = File.createTempFile("WCS", ".tif", dir); <<< fails here
you may be using the default; to set it explicitly, use the "dir" element in WCS section of content/thredds/ThreddsConfig.xml, eg: 

  <WCS>
    <allow>false</allow>
    <dir>/data/tmp/thredds/wcsCache/</dir>
    <scour>15 min</scour>
    <maxAge>30 min</maxAge>
  </WCS>

see:
http://www.unidata.ucar.edu/projects/THREDDS/tech/reference/ ThreddsConfigXMLFile.html
We changed it in latest version because old way was not thread- safe, if 2 requests for the same dataset came in at the same time. 

let me know if that works...



**********************
"The contents of this message do not reflect any position of the U.S. Government or NOAA." 
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097

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