I don't know if it's possible with OJ, but with many other GIS softwares the
user has the possibility to pause rendering (and reading data), adjust zoom
levels, symbology, etc., the start rendering again.
I fear that a feature count limit is quite useless depending on the sequence
in which data rows are mantained: they could be spatially sequential (in
some way) but they could be spatially sparse. Let's suppose they start
sequencially from top-left BBOX: in this case you would render only a region
of the whole dataset, and you may miss the area you're interested in...
my 2 cents,
giovanni
2011/10/11 Rahkonen Jukka <jukka.rahko...@mmmtike.fi>
> Hi,
>
> What do you think, would it be too dangerous to add a possibility to set a
> feature count limit for PostGIS datastore layers? I know I can set scale
> limit for the layer but if I have zoomed to show the whole country when
> adding some layer with millions of features into OpenJUMP is starts to read
> the whole PostGIS table and chokes before it is possible to set the scale
> limit.
>
> What is dangerous is that user would not always have all the data from the
> PostGIS layer on the visible map. Perhaps there should be a red light
> burning and warning the user that there is a count limit set for the layer?
> Even better if the light burns only if the feature limit has been reached.
> Technically it should not be difficult to set the feature count, just to add
> "limit [max_features]" to all the SQL queries if the parameter is set.
>
> -Jukka Rahkonen-
>
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definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2d-oct
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