Exception struck: 10588

[vincentcau]

hello,

I try to use Contour but i have the error Exception struck: 10588.

Can you help me please?
Thanx !

[ccrook]

Not without more information :-)

If you can provide a test data set and the options you are using for contouring then I can look at it.

Cheers
Chris

---

From: Vince [notifications@github.com]
Sent: 22 July 2014 04:21
To: ccrook/QGIS-Contour-Plugin
Subject: [QGIS-Contour-Plugin] Exception struck: 10588 (#8)

hello,

I try to use Contour but i have the error Exception struck: 10588.

Can you help me please?
Thanx !

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/8.

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[vincentcau]

I use the plugin with QGIS 2.4.

The data are an Array of points, results of PostgreSQL request with pgRouting's methods.
results are 263 412 entities
Each points are a node with cost, exemple:
Points = {node : 123, cost : 0.2345643}

Contour configuration :
Input
Vector layer : may_layer
data field : cost
Contouring
contour lines
number: 5
Min: 0.0000
Max: 0.8300
Extend: neither
Method: equal

Layer name : Contour
Label precision 4

I try a lots of config but i have the same error.

[ccrook]

Hi Vince

253,412 points is a lot of points! I suspect the problems is just that your data set is too big for the matplotlib contouring algorithm.

Do you know if the contouring plugin works for you on (much) smaller data sets. I'd just like to confirm that the problem comes from the data set rather than from your set up.

If the problem is the number of points then you may need to use some other approach. For example you could resample down to a smaller data set. I haven't tried doing this, but it looks like some of the processing algorithms may be able to do this (GDAL analysis Grid methods look like good candidates)

Chris

From: Vince [mailto:notifications@github.com]
Sent: Tuesday, 22 July 2014 6:59 a.m.
To: ccrook/QGIS-Contour-Plugin
Cc: Chris Crook
Subject: Re: [QGIS-Contour-Plugin] Exception struck: 10588 (#8)

I use the plugin with QGIS 2.4.

The data are an Array of points, results of PostgreSQL request with pgRouting's methods.
results are 263 412 entities
Each points are a node with cost, exemple:
Points = {node : 123, cost : 0.2345643}

Contour configuration :
Input
Vector layer : may_layer
data field : cost
Contouring
contour lines
number: 5
Min: 0.0000
Max: 0.8300
Extend: neither
Method: equal

Layer name : Contour
Label precision 4

I try a lots of config but i have the same error.

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Reply to this email directly or view it on GitHubhttps://github.com//issues/8#issuecomment-49649508.

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[vincentcau]

Hello Chris,
In fact the problem is my data set contains too many points.
I test with a data set of 10 000 points and the plugin work very well !

i'll change my approach and modify my request, but i would lose i precision.
Thank for your quick response.

Best regards.
Vince

[chadw17]

I still have trouble with this plugin. I am using data with about 20,000
points. I have to delete them until I have only about 500 points before I
stop getting the exception struck error. Going to try again today with a
new set of data points and see what happens.
On Jul 22, 2014 2:07 AM, "Vince" notifications@github.com wrote:

Hello Chris,
In fact the problem is my data set contains too many points.
I test with a data set of 10 000 points and the plugin work very well !

i'll change my approach and modify my request, but i would lose i
precision.
Thank for your quick response.

Best regards.
Vince

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#8 (comment)
.

[ccrook]

Just further to this - I've recently used the plugin with a grid of data that contained over 700,000 points. (Not quick - but it worked). I think that the exceptions that are being struck are generally to do with the configuration of the points. I've released a new version of the plugin that implements an optional (and very crude) point thinning algorithm to help bypass this issue...

[chadw17]

Sounds great. I have a set of data points I am going to try this week will
let you know how it goes. All of the data points I use come from a depth
finder on a boat.
On Jul 27, 2014 4:03 PM, "Chris Crook" notifications@github.com wrote:

Just further to this - I've recently used the plugin with a grid of data
that contained over 700,000 points. (Not quick - but it worked). I think
that the exceptions that are being struck are generally to do with the
configuration of the points. I've released a new version of the plugin that
implements an optional (and very crude) point thinning algorithm to help
bypass this issue...

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#8 (comment)
.