[OpenLayers-Users] Re: WFS layer from Mapserver not displaying

Mon May 16 11:13:34 EDT 2011

Hi Alexandre,

You are giving me lots of new ideas. One of them will be only to make
editable poligons at a certain resolution, for the rest of resolutions, WMS
version will be available. That's the way to avoid performance problems when
working with a high populated layer! very nice
I am taking a look closely to all examples and info you sent me and I will
let you know my opinions about them when I have studied them better. Also, I
will let you know my progress which will go in the direction you recomended
me.
For the moment, I just wanted to thank you very very much for your help and
guide.

Kind regard,

Toni M.

2011/5/13 Alexandre Dubé [via OSGeo.org] <
ml-node+6359912-864548582-335272 at n2.nabble.com>

> Hi Toni,
>
>    Thanks for the inputs.
>
> === tips and tricks, performance, etc ===
>
>    1) WFS-T feature editing requires a certain degree of precision.  It
> is not really relevant to do so in smallscales.  So, you could setup
> your vector layer to be visible and editing widgets to be usable only at
> certain zoom levels.  That way, you would display less features, thus
> making the application faster.
>
>    2) On smaller scales, you could show a WMS version of this layer
> instead (non editable, but at least shows something to the user).
>
>    3) Also, you can read your features from TinyOWS in JSON instead of
> GML.  That makes the requests go faster.
>
>    4) Read the server tuning wiki page from TinyOWS.
> http://www.tinyows.org/trac/wiki/ServerTuning
>
>
> === demos ===
>
>    Here's a bunch of old and recent demos that could help you create
> what you want :
>
>    a) WFS-T demo using OpenLayers only and TinyOWS.  This demo is old
> and use old customized versions of OpenLayers and TinyOWS.  At least, it
> demonstrates 1) and 2) above.
> http://dev4.mapgears.com/bdga/bdgaWFS-T.html
>
>    b) WFS-T demo from TinyOWS website using OpenLayers and TinyOWS.
> Much more "up-to-date" that previous one.  Demonstrates the 3) above.
> http://tinyows.org/tracdocs/demo/OpenLayers-2.9/examples/tinyows_wfs-t.html
> http://tinyows.org/trac/wiki/OpenLayersHowToTransactional
>
>    c) FeatureEditorGrid from GeoExt.ux.  This widget allows the editing
> of vector features using GeoExt and Ext libraries.  It can be adapted to
> WFS-T.
> http://trac.geoext.org/wiki/ux/FeatureEditing
>
> http://dev.geoext.org/ux/geoext.ux/ux/FeatureEditing/examples/feature-editor-grid.html
>
>
> === WFSTFeatureEditing ux ===
>
>    I'm currently working on a GeoExt.ux tool that automatically creates
> every components required to do WSF-T.  I have a wiki page, demo and
> some doc.  It's all non-official (still in development) and not in
> GeoExt.ux (yet ?) but you can take a look.  I'd suggest that you read
> the wiki, then the sample documentation to know how the widget works.
>
>    Basically, it uses the FeatureEditorGrid (mentioned in c) ) and
> doesn't show anything on load.  You need to draw boxes in order to make
> the vector features appear, thus making the navigation faster and only
> shows what the user wants to edit.
>
> http://trac.geoext.org/wiki/ux/WFSTFeatureEditing
>
> http://dev8.mapgears.com/geoext/mg-sandbox-dev/geoext.ux/ux/WFSTFeatureEditing/examples/WFSTFeatureEditing.html
>
>    Don't hesitate to give comments, suggestions, etc.
>
>
> Kind regards,
>
> Alexandre
>
>
> On 11-05-13 09:08 AM, tmartinh wrote:
>
> > Hi,
> >
> > Reason why I want this layer as a vector layer is because I want to be
> > able to modify features coming from Postgis database and represented
> > on that layer using Openlayers and following examples like
> > http://maps.peterrobins.co.uk/files/ol6.html or also
> > http://www.openlayers.org/dev/examples/modify-feature.html In my case,
> > apart from drawing features and them modify it, which I also want, I
> > need to edit features coming from database and first step is to put
> > those features on a vector layer, am I right?
> >
> > I know I will later find other problems because some days ago I learnt
> > that Mapserver does not have support for WFS-T but I also found that I
> > can add that support using extra packages like TinyOWS.. I will see.
> >
> > Also I have to implement drawing controls for the purpose I am
> > explaining on the top of Geoext interface which I am using in
> > collaboration with Openlayers.
> >
> > Your advice on the whole thing is very welcome and I want to thank you
> > very much in advance.
> >
> > Kind regards,
> >
> > Toni M.
>
> --
> Alexandre Dubé
> Mapgears
> www.mapgears.com
>
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