Closest Feature Query

[Abe Gillespie]

Not quite.  It's still just a regular buffer query but instead of
returning multiple results it now returns only one.  The one it
returns is not the same as the closest.

-Abe

On 7/13/05, Stephen Woodbridge <woodbri at swoodbridge.com> wrote:
> Abe Gillespie wrote:
> > Are you sure this can be done?  I'm not finding this specific type of
> > query in the docs.  There is queryByPoint - which seems to be the
> > *closest* to what I'm looking for - but this is a classic buffer
> > query.  I'm looking for sorta the reverse of a buffer query.
> >
> > Buffer - Start point known / distance known -> returns all features
> > w/i the distance from the start point.
> 
> You can get this by requesting multiple results instead of just on
> result. Set mode=MS_MULTIPLE.
> 
> -Steve W.
> 
> > Closest Feature - Start point known / distance unknown -> returns one
> > feature that's closer than all the other features to the start point.
> >
> > -Abe
> >
> > On 7/13/05, Abe Gillespie <abe.gillespie at gmail.com> wrote:
> >
> >>Yes, "as the crow flies" is fine; no routing needed.  How is this done
> >>in PHP MapScript?
> >>
> >>Thanks.
> >>-Abe
> >>
> >>On 7/13/05, Steve Lime <steve.lime at dnr.state.mn.us> wrote:
> >>
> >>>The normal MapServer query will do this but only using "as the crow flies" distances. You use the layer tolerance to set a maximum distance. If you need to need to compute distances along an established route then that's a different story and is not something MapServer can do out of the box.
> >>>
> >>>Steve
> >>>
> >>>
> >>>>>>Abe Gillespie <abe.gillespie at GMAIL.COM> 07/12/05 10:05 PM >>>
> >>>
> >>>Is there an easy way to query for the closest feature to another
> >>>feature.  Take for example the classic "closest ATM" query.  I know
> >>>where I'm at (an address point or building feature) and want the
> >>>closest ATM.  Can I avoid having to create a line to each ATM point
> >>>from the starting point, comparing the length of each line, and
> >>>keeping the shortest?
> >>>
> >>>Thanks.
> >>>-Abe
> >>>
> >>
> >
> 
>