[mapserver-users] show only some point on the map
valerio vianello
valerio.vianello at yahoo.it
Fri Aug 29 02:33:47 EDT 2008
Hi Steve,
I have still some problem,
my setting is the follow
CLASSITEM 'id'
and then into the CLASS
EXPRESSION ('id' IN '%listid%' )
where id is the value in the shapefile and listid is the parameter that I pass to the cgi as a comma separated value.
What's wrong ?
Thanks
Valerio
--- Gio 28/8/08, Steve Lime <Steve.Lime at dnr.state.mn.us> ha scritto:
Da: Steve Lime <Steve.Lime at dnr.state.mn.us>
Oggetto: Re: [mapserver-users] show only some point on the map
A: adams at terrestris.de, valerio.vianello at yahoo.it
Cc: mapserver-users at lists.osgeo.org
Data: Giovedì 28 agosto 2008, 16:27
The IN operator works with all datasources since it's an expression.
I've done this before and it works fine although there are probably some
practical limits in the number of features you'd want to deal with this
way. If you can group the IDs into one var (e.g ids) and then use an
expression like:
EXRESSION ('[myid] in '%ids')
That should work...
Steve
>>> valerio vianello <valerio.vianello at yahoo.it> 08/28/08 5:16
AM >>>
Hi Till,
maybe I forgot to tell you that my data source is a shapefile and not a
database.
so if I have good understood the only solution that I have to try is to
use an SLD file.
Regards to group the point in such a way in not possible in this case
becouse I have a certain number of points and in each request the user
should be able to select the point to show.
br,
Valerio.
--- Gio 28/8/08, Till Adams <adams at terrestris.de> ha scritto:
Da: Till Adams <adams at terrestris.de>
Oggetto: Re: [mapserver-users] show only some point on the map
A: valerio.vianello at yahoo.it
Cc: "mapserver" <mapserver-users at lists.osgeo.org>
Data: Giovedì 28 agosto 2008, 10:41
valerio,
OK, I think you may use more than one subvar, but if there are too many,
...
And there is no way to group the points together in any attribute, which
are shown together?
One solution might be to generate a temporary view in a database (if the
points come out of such) and then
send the name of the view via subvar to your file.
Even better, generate a string out of your selected gid's like
1,3,45,567,789,790
Send this Stringvia subvar to your mapfile and use a "WHERE gid IN ('
YOURSTRING ') in your SQL in the mapfile...
Another possible solution might be...hack around and not really fine,
but write a temporary SLD file - which only works when using mapserver
as WMS server.
You can let a script write a temporary-SLD file, where your filter is
set to your ids and apply this to your getmap request
(&SLD=path/tp/your_name.xml).
To ensure, that only user A uses his filtered SLD, we normally used the
PHP session ID or sth similar for naming the sld.
Many ideas, find the best way for you...
Regards, Till
> Dear Till,
>
> Thanks for the suggestion.
>
> But with variable substitution I am able to specify only one parameter
> like
>
> EXPRESSION ([FNR]=%myid%) .
>
> in this case on the map will be shown only one point (if myid is
> unique) or a group of points (if myid is shared among them)
>
> in my case I want show the points with myid1,myid2,myid3...
>
> how I should set this into the mapfile ?
>
> regards
>
> Valerio
> --- *Gio 28/8/08, Till Adams /<adams at terrestris.de>/* ha scritto:
>
> Da: Till Adams <adams at terrestris.de>
> Oggetto: Re: [mapserver-users] show only some point on the map
> A: valerio.vianello at yahoo.it
> Cc: "mapserver" <mapserver-users at lists.osgeo.org>
> Data: Giovedì 28 agosto 2008, 09:35
>
> Dear Valerio,
>
> I guess what you need is this:
> http://mapserver.gis.umn.edu/docs/reference/mapfile/variable_sub
>
> So add a variable substitution and insert it into your expression
in
the
> CALL section of your layer.
>
> Regards,
> Till
> > Dear list,
> >
> > I have this question:
> >
> > I have a map file in which there is a POINT layer that uses a
> > shapefile as datasource. Is possible with mapserver to do a
request to
> > show only some point on the map ?
> >
> > I know that i can show a group of points or only one point using
> > FILTER and CLASSITEM into the map file but my goal is a bit
different.
> > In my case each poi has an ID into the shapefile, and I want
make
a
> > request to serve the follow question:
> >
> > Show on map the poi with ID 3,6,8.
> >
> > any suggetsion ?
> >
> > P.S I'm using CGI interface maybe is this possible to do with
> mapscript ?
> >
> > thanks everybady
> >
> > Valerio
> >
> >
> > > Poco spazio e tanto spam? Yahoo! Mail ti protegge dallo
spam e
ti
da
> >
> tanto spazio gratuito per i tuoi file e i messaggi
> > http://mail.yahoo.it
> >
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> >
>
>
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----------------------------------------------------------
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Geschäftsführung
Tel: +49 (0)228 / 962 899-52
Fax: +49 (0)228 / 962 899-57
adams at terrestris.de http://www.terrestris.de
Amtsgericht Bonn, HRA 6835
---------------------------------------------------------
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vertreten durch:
Hinrich Paulsen, Till Adams
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