Re: [mapserver-users] Showing pop up for a line

2009-01-06 Thread Dan Little 
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 su...@gslab.com
 To: Steve Lime steve.l...@dnr.state.mn.us
 Cc: mapserver-users@lists.osgeo.org
 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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Re: [mapserver-users] Showing pop up for a line

2009-01-06 Thread Subha Ramakrishnan 

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 su...@gslab.com
To: Steve Lime steve.l...@dnr.state.mn.us
Cc: mapserver-users@lists.osgeo.org
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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Re: [mapserver-users] Showing pop up for a line

2009-01-06 Thread Steve Lime 
Why not use straight MapServer queries? Set a reasonable tolerance and that 
should
work ok too.

Steve

 On 1/6/2009 at 12:04 AM, in message 4962f45d.3010...@gslab.com, Subha
Ramakrishnan su...@gslab.com wrote:
 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
 ___
 mapserver-users mailing list
 mapserver-users@lists.osgeo.org 
 http://lists.osgeo.org/mailman/listinfo/mapserver-users

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Re: [mapserver-users] Showing pop up for a line

2009-01-06 Thread Dan Little 
You may also want to use mapserver to render the lines as a raster layer 
instead of vector.



- Original Message 
 From: Steve Lime steve.l...@dnr.state.mn.us
 To: Subha Ramakrishnan su...@gslab.com
 Cc: mapserver-users@lists.osgeo.org
 Sent: Tuesday, January 6, 2009 9:31:18 AM
 Subject: Re: [mapserver-users] Showing pop up for a line
 
 Why not use straight MapServer queries? Set a reasonable tolerance and that 
 should
 work ok too.
 
 Steve
 
  On 1/6/2009 at 12:04 AM, in message 4962f45d.3010...@gslab.com, Subha
 Ramakrishnan wrote:
  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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[mapserver-users] Showing pop up for a line

2009-01-05 Thread Subha Ramakrishnan 

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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