[ka-Map-users] how to realize such effect

[stin wang]

Can you write it as a wiki?

2007/8/6, Victor <bobbie at ua.fm>:
>
> > I'm a little confused about what you say.  Do you mean when i click one
> > point , it's just ask for a query?
> >
> > because i think query is just i type in some word, and then something
> happen
> > to look up in some tables.
> >
> > I look through your suggestion and the URL you gave me , but found no
> > example as i asked.
> >
> > i think it's very popular application , maybe someone has realized
> before.
> > I'm a beginner, so maybe i misunderstand what you say.
>
> (: Ok, not a problem.  I will try to better explain my answer, using
> the application I am currently developing as an example.
>
> So, I have a situation, when there is a set of locations where some
> resources are placed.  Each resource has its coordinates, and a set of
> attributes (like dwelling depth, water temperature and so on).  The
> task is to make a map of Ukraine with these locations marked on the
> map.  And, when the user clicks the mark with the <<info>> tool, a
> small window should pop-up with detailed resource description.
>
> It seems to me, that the task I am solving is very similar to what you
> are doing.
>
> So, I have setup a table in PostgreSQL database with PostGIS
> extensions describing the resources I have.  Then, I have modified the
> myQuery function to call my custom script to process the user clicks
> with the <<info>> tool.
>
> As far as I understand, myQuery function is responsible for user
> queries processing.  It can be found in the startUp.js script
> corresponding to the User Interface you have choosen (kaExplorer or
> kaAqua).
>
> If you look at this function definition, you will see that it takes
> some information about the map, geographical coordinates, where the
> user clicked, and calls some script (map_query_float.php by default).
> In my case, I use geographical coordinates to find the corresponding
> resource based on the distance to it (see PostGIS manual for detailed
> instructions how to do this efficiently).  When the resource is
> identified, my script builds a pretty table with resource description.
>
> The <<basic>> map is rendered from the Shapefiles, and resources are
> taken from the database (see MapServer manuals for detailed
> instructions).
>
> So, this seems to me a pretty good solution,
>
> With best regards,
>
> Victor
>
> >
> > 2007/8/5, Victor <bobbie at ua.fm>:
> > >
> > > > how to realize such effect. i add some point data, and when i click
> one
> > > > point , it's open a new windows do some work(show a image, or
> execute a
> > > > python script
> > >
> > > Greetings Stin,
> > >
> > > what you are asking for, sounds very similar as the Query system
> described
> > > on the
> > > ka-Map WIki:
> > >
> > > http://ka-map.ominiverdi.org/wiki/index.php/Query
> > >
> > > Basically speaking, you should redefine the myQuery function in the
> > > startUp.js file
> > > (either tools/kaExplorer or in the aqua UI).
> > >
> > > Then, it is possible to use PostGIS functions to locate the point of
> the
> > > layer nearch
> > > which the mouse was clicked.
> > >
> > > With best regards,
> > >
> > > Victor
> > >
> > > http://vityok.org.ua
> > >
>
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> http://www.fxclub.org/filials_kiev_reg
>
>


-- 
----------------------------------------------
Tie Wang
TianJin Climate Center
TianJin Meteorological Bureau
Tianjin, China, 300074
Email: stin.wang at gmail.com
Tel:+86-22-23331566-2377
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