[TinyOWS-users] An enhancement for TinyOWS

[Carlos Ruiz]

Andrea,
 
QGIS allows you to enable/disable the drawing of the features as they're loading. Please try to load that huge dataset with the 
drawing disabled to see if this increase the performance. After the load got finished, enable the drawing again.
 
Cheers from México

IC Carlos Ruiz
 
From: Andrea Peri <aperi2007 at gmail.com>
To: TinyOWS users discuss list <tinyows-users at lists.maptools.org>
Sent: Thursday, September 1, 2011 4:35 PM
Subject: [TinyOWS-users] An enhancement for TinyOWS


Hi,

I'm study-ing TinyOWS as server WFS,
using qgis as wfs client.

I notice a procedural issue when the dataset is huge.

It need a very much time to startup on first visualization.
The qgis plugin need to download all the dataset.
The only solution to avoid this time lost, is activate the "limit-feature" option.
But it is a strange solution.
Infact the qgis WFS-plugin download the first feature untile the limit set, and after don't show any other dataset.
If I try to zoon to a details if the detail is out of the first downloaded feature, simply qgis show nothing.
Perhaps this is an issue of qgis plugin, but however I guess the "limit-feature" solution for huge dataset is not a  
solution in many use-case.

I guess a better approach should be a 
dimension approach.
Allowing the size in unit of length of the max dataset retrievable.

something like

<limits unit-of-lenght="1000" />  (dont send when the portion asked is more than a square of 1000x1000 unit-of-lenght)

For example setting max retrievable size = 1000 meters,
the wfs server should be send data only if the bbox asked has a size under
1000meters x 1000meters

Without see how much features it could contains.

Of course this mean to set something like a scale-dependent limitation,
but this in many use-case is more affordable then a limit-features .

Regards,

-- 
-----------------
Andrea Peri
. . . . . . . . . 
qwerty àèìòù
-----------------


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