[Geomoose-users] strange problem with select

[Jim Klassen]

The Select Features tool appears to be working how I would expect in the demo.

Select Features from Parcel.  Buffer Selection Shape 100ft. Using Features in No Layer.



Yellow is selected shapes, thick orange is the final query shape, purple/filled is the user drawn shape.


Order of operations is take the shape drawn by the user.  Buffer that shape by 100ft.  Using that buffered shape, preform an intersection against the Parcels layer.  Return the intersecting features from the Parcels layer.

If Using Features In is set, the order of operations is:  Take the shape drawn by the user,  buffer that shape by 100ft.  Using that buffered shape, preform an intersection against the "using" layer.  Use the results of the "using" layer to do an intersection search from the "From" layer.  (And it looks like intersects in this case is including touches, including if only at one point).

Maybe we should switch the order of the lines to put them in the order they are applied (buffer, using, from).

On Jul 31, 2013, at 10:48 AM, Bistrais, Bob wrote:

> Hi Eli,
>  
> It appears to be random which adjacent polygons are selected. 
>  
> Actually, yes, I see the same issue in the demo- try the Select Features tool.  Use a buffer of 20 feet or so, using features in Parcels.  Now select a parcel and hit Go.  You’ll see that it selects some of the adjacent parcels, but not all of them (at least not in my testing).  Try it and you’ll see what I mean.
>  
> If you select just one polygon, then do the “Buffer these results”, I am finding it more consistent in selecting the adjacent polygons.
>  
>  
> From: Eli Adam [mailto:eadam at co.lincoln.or.us] 
> Sent: Wednesday, July 31, 2013 11:20 AM
> To: Bistrais, Bob
> Cc: geomoose-users at lists.osgeo.org
> Subject: Re: [Geomoose-users] strange problem with select
>  
> Bob,
> 
> 
> On Tue, Jul 30, 2013 at 1:29 PM, Bistrais, Bob <Bob.Bistrais at maine.gov> wrote:
> I am working on a GM parcel application (GM 2.6.1).  I was testing the buffered select service.  With no buffering (just select by mouse), it seems to work fine.  On the buffered select I encounter a weird problem.   If you select a parcel, set a buffer distance and query layer (the parcels), click Go- it selects only a few of the surrounding parcels.  In other words, if I set a buffer distance of 50 or 100 I’d expect to get all adjacent parcels selected, but it only selects some of the expected result.
> 
> 
> Is it random which ones are selected?  Is it a shift one way or the other?  Area you able to see this in the demo?  Are some never selected?  Do you know if you have invalid/odd geometries or data in those areas?  If you have a PostGIS instance handy, you might want to load it up and run ST_IsValid (http://postgis.net/docs/manual-2.0/ST_IsValid.html) or similar functions to see if there is any pattern of this problem with something that might be in the data. 
>  
> This isn't a lot of detail to try and figure it out.  You might be able to get more info from checking the requests and responses in firebug (i.e. perhaps it is a bad request vs. bad response vs. bad handling of a correct response, etc). 
>  
> I hope these ideas lead to something useful.
> 
> Eli
>  
>  
> 
> The data is a shapefile, if that matters.   Although I had started modifying the select.php for my project, I went back to the original when I discovered the problem, and it’s still doing it.  Any idea what’s going on?
> 
> 
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>  
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