[Qgis-user] contour plugin

[David M. Lawrence]

Dear all:

I tried all of this -- contour does work on my machine with a dataset I 
downloaded from an online tutorial, so I think the problem may be with 
my data instead.  The tutorial's data were obtained from an evenly 
spaced grid.

My data are not evenly spaced. They are soundings (depth measurements) 
from a quarry linked to geographic data obtained via a GPS receiver.  
The measurements are irregularly spaced.

The latest version of the data set has more than 900 points covering 75 
percent of the aerial extent of a quarry.  I've been running the contour 
procedure for 12 hours now.  The contour dialog box indicates it is "not 
responding," but I know from other software that that may mean the 
contour procedure is actually thinking.

Every time I check Task Manager (I'm running QGIS Wroclaw on Windows 
7-64) the number of processes seems to fluctuate around 50, with an 
observed range of 42 to 52.  The amount of memory consumed ranges from 
68,000 Kb to a little more than 100,000 Kb.

 From this, I consider the hypothesis that contour is working more 
likely than the hypothesis that it has frozen.  Comments, anyone?

Thanks again for your time.

Sincerely,

Dave Lawrence

On 7/10/2012 3:58 AM, Alister Hood wrote:
> Anyway, since you seem to be able to start the plugin, your problem doesn't appear to be with getting it all installed.  Some ideas:
> - Try  the plugin on an even smaller dataset to see if it works (If I remember correctly, I think it might be quite slow, but several hours for 400 points does seem like a very long time).
> - When the plugin appears to be frozen, can you look in the windows process manager to see if it is actually doing any work?
> - Remove the separate Python and all the associated junk to see if that is affecting QGIS.  (But I doubt that it is)
> - Provide your data for someone else to check that it works fine on their system.
> Also, I could be wrong, but I think I remember this plugin freezing for me, and then somehow working fine when I tried it again with exactly the same options... have you tried it a second time?
>
> Regards,
> Alister
>

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