Hi,
Thanks a lot for the reply.
If i use
"ST_Contains(topology,st_expand(geomFromText('POINT(77.87117958068927
13.491965860913544)',-1), 10)", can it be the case that more than one
record will match the condition? And this will not work for me, as I
need to have exactly one record to show the pop up.
The constraint I'm facing in using Openlayers to draw the line layer is
that the layer is too huge consisting of more than 20,000 features and
the browser hangs because of too much memory being used in drawing the
layer. Hence I am using mapserver for drawing the line layer.
I did try other options here. The operator "~" [A ~ B (A completely
contains B)] gives me more than one line(record) that matches the
condition. But this cannot be the case to show the pop up. I did try to
club it with other operators like "&&" and "=" but none of these seem to
work.
Thanks again.
Regards,
Subha
Dan Little wrote:
In my experience it's easier to do a buffer on the line features first
(something nominal) which turns it into a polygon. In this way, the operators
you want to use work consistently.
----- Original Message ----
From: Subha Ramakrishnan <[email protected]>
To: Steve Lime <[email protected]>
Cc: [email protected]
Sent: Tuesday, January 6, 2009 12:04:13 AM
Subject: [mapserver-users] Showing pop up for a line
Hi,
I am using Mapserver 5.0.2 with Openlayers.
I've a line layer (from mapserver) shown on my base map(google physical).
Now, when i click on a line, i want to show a pop using openlayers.
I am able to do this for a polygon layer. I send the lat,lon of the point that
is clicked and use the postgis query
"ST_Contains(topology,geomFromText('POINT(77.87117958068927
13.491965860913544)',-1))" to find the polygon (and fetch the polygon specific
data to show on pop up) and attach the Openlayers popup to the point clicked.
I am not able to do this for a line layer as the postgis query doesn't return
anything.
I tried this query also,
"ST_Contains(topology,geomFromText('POINT(77.87117958068927
13.491965860913544)',-1)) AND
distance(topology,geomFromText('POINT(77.87117958068927
13.491965860913544)',-1)) <= 1" but it doesn't work.
Does any one know how to check if a point is a part of a line or if there is any
other way to show the pop up?
Thanks a lot for the help.
Regards,
Subha
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