[mapguide-users] Re: "Failed to read schema..." error with GDAL

[Kenneth Skovhede, GEOGRAF A/S]

The error message "failed to read schema" means that the 
"DescribeSchema" operation gave an error.
As you can perform the "DescribeSchema" operation fine manually, there 
is likely an error in Maestro.
I have modified Maestro to pick up a better (longer) description of the 
error.
You need to install the preview version of Maestro before you can try 
the modification.
The preview version is avalible for download on the usual download page, 
just scroll down a bit.
Once installed, repeat what you have done so far, and there should now 
be more information,
if you click "About" -> "Last exception".
If you email me the content of the "Last Exception" window, I will 
attempt to fix the problem.

The purpose of the "DescribeSchema" operation is to fill the combo boxes 
in the editor.
As they are filled correctly, the error message is likely a cosmetic 
issue (eg. it can be ignored).

I used the "GMARBLES.tiff" from this page:
http://www.fileformat.info/format/tiff/sample/index.htm

But it is not a realistic TIFF file, as it has no spatial context.

Given the information that you can select the raster schema/column,
I belive Maestro does what it is supposed to. You can look in the xml,
to see if there is something obvious missing.

If the xml looks correct, it is likely a problem with your GDAL 
configuration.
You can look in MapGuide's error.log for hints, alternatively try this 
guide:
http://trac.osgeo.org/fdo/wiki/FdoGdalNotes

Look under "Debugging rasters in MapGuide"

Regards, Kenneth Skovhede, GEOGRAF A/S

On 05-02-2010 13:23, magnoliazz wrote:
> Hi Kenneth,
>
> How can I do that? I'm sorry, but could u provide a lil more details cause
> I'm still a newbie in this.
>
> And would you have a sample raster that works for you that you can send me,
> or a link to download it from.
>
> I have reinstalled the Gdal binaries, but in vain.
>
> I just want to know where does the problem come from, is it the provider,
> tha raster file or the software itself. The error message says that it
> failed to read schema from data source, what do u think this means?
>