[kepler-dev] [kepler-users] GDAL format Translator Crashes my workflow

[Chad Berkley]

Hi Niels,

After looking into this more, I think the actor should work as you 
describe.  When I run your workflow, I get the error:

ERROR 4: `/home/berkley/tmp/gdal_wms.xml' not recognised as a supported 
file format.
      [java]
      [java] GDALOpen failed - 4
      [java] `/home/berkley/tmp/gdal_wms.xml' not recognised as a 
supported file format.

If I try to run the same command on the command line I get:

berkley at dana:~/project/ptII$  gdal_translate -ot Byte -of GTiff 
~/tmp/gdal_wms.xml gdal_wms.tif
ERROR 4: `/home/berkley/tmp/gdal_wms.xml' not recognised as a supported 
file format.

GDALOpen failed - 4
`/home/berkley/tmp/gdal_wms.xml' not recognised as a supported file format.


Is it working for you when you run it on the command line?  I just 
installed the newest version of gdal available for ubuntu and I get that 
error when using your input file.

I was able to get the actor to stop crashing the entire workflow by 
specifying "No Caching" in the cache options for the gdal_translate actor.

chad


Niels Hoffmann wrote:
> Hi Chad,
>  
> Maybe I misunderstood the purpose of the GDAL Format Translator. I 
> assumed it was a wrapper around gdal_translate.exe. The way GDAL 
> Translate works is you throw any of the supported file types at it 
> (including wms) and you specify the output Type and Format (see my 
> example C:\FWTools2.1.0>gdal_translate -ot Byte -of GTiff gdal_wms.xml 
> gdal_wms.tif)
> Is it true that the GDAL Format Translator actor only accepts GTiff as 
> input and converts that into any of the supported output formats?
> In which case it is not usable for my purposes. Can you recommend an 
> actor to consume a WMS service to then do image analysis on? I tried 
> using the 'Convert URL To Image' actor but I can't seem to get hold of 
> the resulting image for analysis purposes.
>  
> Cheers,
> Niels Hoffmann
> 
>  >>> Chad Berkley <berkley at nceas.ucsb.edu> 2/04/2008 7:37 a.m. >>>
> Hi Niels,
> 
> I've been looking into this and I think you're sending the GDAL Format
> Translator the wrong file type.  It's expecting a GTIFF and you're
> giving it an xml file.  Take a look at
> kepler/workflows/test/gdal-test.xml for an example.  Let me know if it
> still won't work for you.
> 
> The error handling on the JNI connection between the GDAL C code and the
> java interface is not very good.  That's why it just crashes when
> something goes wrong.  Not optimal, I know but the interface is pretty
> lacking when it comes to error handling.
> 
> chad
> 
> 
> Niels Hoffmann wrote:
>  > Hi Chad,
>  > 
>  > Here's the workflow as well as the wms specification file for gdal. The
>  > WMS Service is behind our Firewall, so you won't be able to access it.
>  > As I explained in the original email, if I run the following on the
>  > command prompt I get a valid Tif file.
>  > C:\FWTools2.1.0>gdal_translate -ot Byte -of GTiff gdal_wms.xml 
> gdal_wms.tif
>  > 
>  > I'm running Kepler 1.0.0rc1 on WinXp sp2.
>  > I basically copied part of the workflow from demos\ENM\GDAL_h1K_NS.xml.
>  > 
>  > What I noted is that if I open the GDAL Format Translator actor in that
>  > workflow it has dropdowns for 3 of the parameters:
>  > 
>  > If I grab the actor in a new project from the GeometricOperation
>  > components it does not have those dropdowns:
>  > 
>  > Might it be that there are 2 different versions installed? I tried both
>  > (dragging the one from the components and copying the one out of the
>  > sample workflow) and both are crashing.
>  > I also have FWTools 2.1 installed (1.6.0dev) as well as the GDAL
>  > Binaries in my Python installation (1.5). Is the actor grabbing GDAL
>  > from the system path or is it locally to the Kepler install? (I noticed
>  > the 1.2 dll sitting in the Kepler\lib folder)
>  > 
>  > Cheers,
>  > 
>  > 
>  > =============================
>  > Hi Niels,
>  >
>  > I'm looking into this.  Could you email me the workflow you are using?
>  >
>  > thanks,
>  > chad
>  >
>  > niels hoffmann wrote:
>  >> Hi,
>  >> 
>  >> I am trying to use a GDAL Format Translator to convert a WMS service
>  >> to a GeoTiff.
>  >> I created a xml file with my WMS connection settings as specified by
>  >> the GDAL Documentation. If I run it from the GDAL Command prompt
>  >> (FWTools) I get a proper result.
>  >> But if I use the same xml file as input for the GDAL Format Translator
>  >> my workflow crashes.
>  >> Attached is the dump that gets created.
>  >> Anybody knows what my problem is?
>  >> 
>  >> Is there maybe another way to use a WMS service in Kepler?
>  >> 
>  >> Kind regards,
>  >> Niels Hoffmann
>  >>
>  >>
>  >> ------------------------------------------------------------------------
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>  >>
>  >> 
>  >> Niels Hoffmann
>  >> GIS Specialist
>  >>
>  >> ph: +64 (0)7 859 3726
>  >> fax: +64 (0)7 859 3701
>  >> Email: hoffmannN at landcareresearch.co.nz
>  >>
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