[maplab-users] Query question

Post,Richard [NCR]
Mon, 24 Nov 2003 09:47:03 -0500
Hi Matt,

I have not found a solution (I changed my query icon to represent a
rectangular query!).  That is an interesting observation about projected
verses non-projected data.  My application uses projected data as well
(LCC).  Anyone have any more suggestions we might try?

Richard Post  

-----Original Message-----
From: Matt Doggett [] 
Sent: November 21, 2003 6:58 PM
'Post,Richard [NCR]'
Subject: RE: [maplab-users] Query question

Allow me to shed a little more light on this problem.

- I have a map file which outputs a map in "latlong" projection (ie.
Unprojected geographic). With this map, a single click WILL return query
- An identical application (same map file, data, ...everything) but
outputs a PROJECTED map, using "aea" in my case, does NOT work. Ie. You
have to click-and-drag in order for the query results to return

So, perhaps someone could explain why my Maplab application behaves
differently for projected/unprojected maps?


>-----Original Message-----
>From: [mailto:maplab-users- 
>] On Behalf Of Matt Doggett
>Sent: Friday, November 21, 2003 3:31 PM
>To:; 'Post,Richard [NCR]'
>Subject: RE: [maplab-users] Query question
>I noticed that I have this exact same behavior. Changing the MIN_RECT 
>appears to have no effect.  I was wondering if you discovered any 
>solution to this problem? Would be nice to have working queries without

>having to drag the mouse all the time.  Having to click-n-drag inside a

>polygon to select that polygon seems kind of silly.
>>-----Original Message-----
>>From: [mailto:maplab-users- 
>>] On Behalf Of William A. Bronsema, C.E.T.
>>Sent: Friday, October 17, 2003 4:36 AM
>>To: Post,Richard [NCR]
>>Subject: Re: [maplab-users] Query question
>>Hi Richard,
>>I'm not sure if this will help or not, but FYI -
>>There is a constant defined in the globprefs.php file for your 
>>gmapFactory application that should look something like this ( In my 
>>version it is on line 65):
>>define( "MIN_RECT", 5 );
>>This constant controls the difference between a "point click" and 
>>"rectangle select".  Essentially all interactions with the map are 
>>"rectangle selects".  This constant tells the application the
>>at which the user was intending to perform a "point click" (i.e. a
>>rectangle) instead of a "rectangle select".
>>In the case of querying, if the value is too small then more often
>>not a tiny rectangle query will be performed instead of a point query 
>>which can lead to confusing results.
>>William A. Bronsema, C.E.T.
>>Applications Developer
>>DM Solutions Group Inc.
>> ____________________________________
>>Post,Richard [NCR] wrote:
>>> Hello,
>>> I have a small problem with my gmapfactory application.  The
>>> uses the query function to select points from a shape file.  The
>>> is that the query only works when you drag a box over the points
>>> Doing a rectangular query).  When you simply click on the point
>>> is selected (ie. The layer does not return any results).  I have
>>> tried changing the TOLERANCE and TOLERANCEUNITS in the map file,
>>> does not seem to have any effect.
>>> Any suggestions would be welcome.
>>> Thanks,
>>> Richard Post
>>> Environment Canada
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