[Qgis-user] merged files generating "bad handles"

[Nicolas Cadieux]

Hey Buddy!

It helps if you give more info on the platform you are using (Windows, 
Linux disto...) the QGis version and the way you are accessing the GDAL 
merge.  That being said, if you are using the processing toolbox plugin 
to use this tool, it will, by default, save the results as a temporary 
file that is probably erased when you log off.  You need to specify the 
file name and the complete path to make sure you will keep the file.  
Once the file is loaded in Qgis, it will normally not have the name you 
gave it but will have a generic named like "merged.tiff". (The file name 
on the disk will be good).  Hover your mouse over the layer in the Layer 
Panel or look in the layer - properties - metadata - properties - Source 
for this layer, and you should find the complete path.

I normally reload the file so that the file name and layer name match.  
If you are using the Merge from the raster - misc - merge tool, make 
sure you click on the "Select" button so that you can save it in the 
right place.  If you just put the Output file name, I think the file is 
save in the last used directory but I am not sure.  If you still have 
problems, look at the gdal script
in the box.  That should also give you full path of the output file.  
Ultimately, you can cut and paste this script into the OSGeo command 
prompt and by-pass Qgis completely.  BTW, there is a limit to the number 
of files you can merge together.  If you have more that a hundred files 
to merge, I would make a virtual file than save that using gdal translate.

Hope this helps.

Nicolas
(Newfoundlander by heart!)

Cheers!

FWI, I have a Google + community called QGIS Canada.  There is not much 
going on there now but I would like to eventually use it for Canadian 
users looking for tip and data pertaining to Canadian data sets, 
research questions and problems. Please make it known to your students.  
The Qgis mail list, remains the best option for your current question.




Le 2016-02-17 03:18, rsweeny [via OSGeo.org] a écrit :
> Hi people
> When merging files I often get a working file that I am able to save,
> see and work with but when I reopen Qgis it reports that the files have
> bad handles and as I cannot locate where the file was saved to (despite
> various searches) I lose the work. Any suggestions on what I might be
> failing to do.
> thanks
> Robert
>
> -- 
> Robert C.H. Sweeny
> Professor of History
> Memorial University of Newfoundland
> St John's NL, A1C 5S7
> Canada
> 709-864-8440, 709-864-2164 (fax)
>
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