[mapguide-users] SetSpatialFilter and MgFeatureSpatialOperations problem with search

[Maciej Skorczewski]

Hi Kenneth

thx for answers.

i thing about another solution , how about  use postgis spatial function?...

plan is:

1. get all coordinates of parcels/region from mapguide setspatial results

2. use postgis spatial function (question is: can i use sparial function 
without insert to database?, can i make in only as sql query?)

3. so when small parcel is IN bigger region then true/false.


i try this, i give you solution/answer.

macieksk



> I have seen cases where the first record of the datasource is returned 
> no matter what the query is.
> You are likely seeing a different problem, but now you know :).
> 
> In the pretty picture you have drawn, the lower part shows the parcel 
> (with the number three), which
> clearly touches the yellow parcel. AFAIK, there is no direct spatial 
> operation that allows you to
> select only the grey one. You can however calculate the area of which 
> the two polygons overlap,
> and filter out the yellow, based on overlapped area. You can choose to 
> discard polygon with
> a very smal overlapping area, or only select the one with the largest 
> overlapping area.
> 
> Is there a problem with only selecting parcels that intersect the actual 
> point the user clicked on?
> 
> If you are actually using the point, you are likely using the OGR 
> provider, and having this problem:
> http://trac.osgeo.org/fdo/ticket/343
> 
> Regards, Kenneth Skovhede, GEOGRAF A/S