[ka-Map-users] selection sets

[Samuel Hiatt]

To be honest I haven't worked too much with the ka-map query system,
especially with vector data.  However, I do plan on working on this soon.

What you've described actually sounds fairly easy to implement.  Mapserver
takes care of selecting the objects that fall within the bounding box given
and returns the attributes of the results (I believe).  So ka-map is
actually just allowing you to define the rectangle and it sends that
rectangle to Mapserver which executed the query.

I suggest you check out 2 things:
First, Mapserver's documentation of its query system.
Second, take a look at map_query_float.php in the ka-map source.  It takes
the query bounding box as arguments, makes the mapserver call, and then
echoes the results to an HTML div waiting for the reply.

Hope it works!  We'll all love to see the app you come up with!

Sam



On 9/18/07, Fox, Alistair D (SKM) <AFox at skm.com.au> wrote:
>
>  Thanks Sam,
>
> I would assume if you can do a query on point data then line and polygon
> data would be the same. Just a few techy questions. I gather to be able to
> do this the source data would need to be served out from a mapserver
> instance. Are there any examples of this out on the web. I'm yet to see any.
> On a scale of 1-10 how difficult would it be to develop what my client is
> after. Eg: draw rectangle and select spatial objects (point/ line / poly)
> and then return attributes of selection for further manipulation.
>
> Alistair
>
>  ------------------------------
> *From:* Samuel Hiatt [mailto:samhiatt at gmail.com]
> *Sent:* Tuesday, 18 September 2007 12:50 AM
> *To:* Fox, Alistair D (SKM)
> *Cc:* ka-map-users at lists.maptools.org
> *Subject:* Re: [ka-Map-users] selection sets
>
> Hi there Alistair!
>
> Yes!  ka-map is the answer to all your problems!  :p  You can definitely
> do a query on point data with a rectangle bounding box.  I couldn't help you
> too much with the details of it as I work mainly with raster data at this
> point, but there are plenty of us around here who would be happy to help you
> get kamap set up and running!
>
> Sam
>
>
>
>
> On 9/16/07, Fox, Alistair D (SKM) <AFox at skm.com.au> wrote:
> >
> >  Hi. I'm a newbie to Ka-map and are looking to confirm potential
> > functionality for a client. From what i have seen so far this is an
> > execellent project.
> >
> > One of the requirements my client has is the ability to do the normal
> > GIS function of dragging a rectangle over the map and be able to select the
> > features that are within that area. Then the ability to working with this
> > selection set. e.g: display attributes about the features.
> >
> > What i need to know is can you do this at the moment, (i havn't seen any
> > examples) and if not is it possible with some customisation.
> >
> > Hope someone out there can help.
> >
> > Alistair
> >
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> future for all. Please consider the environment before printing this e-mail.
> Notice - This message contains confidential information intended only for
> the exclusive use of the addressee named above. No confidentiality is waived
> or lost by any mistaken transmission to you. If you have received this
> message in error please delete the document and notify us immediately.
> Any opinion, text, documentation or attachment received is valid as at the
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