[OpenLayers-Users] Slow WFS filter layer

[Ivo Limmen]

Paul,

You can always style the WMS layer. I myself use that a lot. It depends how
much the user can/may change of the layer but if it is just a few
attributes I would suggest to create a style template on your webserver,
create a url in javascript that adds the user inputted style changes and
merge the new SLD parameter on your WMS layer. It's easy and fast.

Ivo

On Mon, Jul 2, 2012 at 10:17 PM, Paul Meems <bontepaarden at gmail.com> wrote:

> Thanks Ivo for your input.
>
> I use a WFS layer because the user can change the attributes using a form
> and then the colors of the features need to be changed.
> I understood I need a WFS layer to do so.
>
> Can I change the colors of the features (based on Terugverdientijd = ROI)
> using your approach?
> If so I can try that.
>
> Thanks,
>
> Paul
>
>
>
> 2012/7/2 Ivo Limmen <ivo at limmen.org>
>
>> Paul,
>>
>> Looked at your site and I do not really understand why you would want to
>> use a WFS layer to zoom in on an adres. I would simply:
>>
>>    1. create a filter based on the input of the user.
>>    2. create WFS protocol
>>    3. add a callback on the WFS callback and zoom to the extend of the
>>    returned features.
>>
>> But that is just my 2 euro cents.
>>
>> Ivo
>>
>> On Mon, Jul 2, 2012 at 9:53 PM, Paul Meems <bontepaarden at gmail.com>wrote:
>>
>>> Hi Milo,
>>>
>>> Thanks for the quick reply.
>>> 1. Yes, GeoServer and PostGIS are on the same server (dedicated server @
>>> RackSpace)
>>> 2. What is enough RAM? I now have 2GB, with only Ubuntu, GeoServer and
>>> PostGIS
>>> 3. My dataset has 67k features. I can try tomorrow with a smaller
>>> dataset.
>>> 4. I'm using FF v13 with FireBug.
>>> 5. I'll also try the empty string as initial filter.
>>>
>>> Here's a live sample:
>>> http://demo.smartdakscan.nl/zonnekaart.php (in Dutch).
>>>
>>> Thanks,
>>>
>>> Paul
>>>
>>>
>>> 2012/7/2 Milo van der Linden <milo at dogodigi.net>
>>>
>>>> I am doing something similar, but my initial filter is an empty string
>>>> "" that gets set to a valid string later on. I do not use an id, but use
>>>> the filter to limit results to a viewers organizational unit. I have seen
>>>> over a hunderd features displayed in less then a second. The underlying
>>>> table is oracle spatial with less then 10k records.
>>>>
>>>> To dig in deeper:
>>>> 1. Are geoserver and your db on the same machine?
>>>> 2. Do you have enough RAM?
>>>> 3. Did you test smaller datasets which generate the same result and are
>>>> they faster?
>>>> 4. What browser are you using?
>>>> On Jul 2, 2012 9:18 PM, "Paul Meems" <bontepaarden at gmail.com> wrote:
>>>>
>>>>> I use GeoServer and PostGIS and OpenLayers to show the data.
>>>>> For one page I'm using a WFS layer and I filter on address.
>>>>>
>>>>> The user first need to select an address. This is done with an AJAX
>>>>> call and the adresID and the location (X, Y) are returned.
>>>>> I zoom to that location and change my filter.
>>>>> This is my initial set-up of my layer, an addressID of -1 doesn't
>>>>> exists so it starts with just the baselayer:
>>>>>
>>>>> var myLayer = new OpenLayers.Layer.Vector("tmp", {   displayInLayerSwitcher: true,  strategies: [new OpenLayers.Strategy.BBOX()],  filter: new OpenLayers.Filter.Comparison({           type: OpenLayers.Filter.Comparison.EQUAL_TO,          property: "_adresid",          value: "-1"}),  styleMap: new OpenLayers.StyleMap(),  protocol: new OpenLayers.Protocol.WFS({     url: ".../wfs",    featureType: "myName",    srsName: "EPSG:3857",    geometryName: "geomgoogle"  })});
>>>>>
>>>>> But this call takes long because it tries to find the -1 value.
>>>>> *Q1*: How can I add a WFS layer without data?
>>>>>
>>>>> And this is the method I call after the user selects an address:
>>>>>
>>>>> function changeFilter(newValue, x, y){   myLayer.destroyFeatures();  filter = new OpenLayers.Filter.Logical({     type: OpenLayers.Filter.Logical.AND,     filters: [       new OpenLayers.Filter.Comparison({           type: OpenLayers.Filter.Comparison.EQUAL_TO,           property: "_adresid",           value: newValue       }),       new OpenLayers.Filter.Spatial({           type: OpenLayers.Filter.Spatial.BBOX,           value: new OpenLayers.Bounds(x-50, y-50, x+50, y+50),           projection: "EPSG:3857"       })   ] });   myLayer.filter = filter;  myLayer.refresh({force: true});
>>>>>   showAttributes();
>>>>> }
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> This is working great, but is does take a very long time: about 7-10
>>>>> seconds.
>>>>> The result are just a few features: 3-10
>>>>>
>>>>> Of course I have an index in the database on _adresid and a spatial
>>>>> index.
>>>>>
>>>>> *Q2*: What else can I do to speed up this filter?
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Paul
>>>>>
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>>>>>
>>>>>
>>>
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>>
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