Knut,
> I'm working on a project where I want to find natural reservations and
> other protected areas within a distance (200m) from public roads. I'm
> using a buffer and clipper to identify the part of the areas that lies
> within the given distance. My next step is to calculate the potential
> conflict based on the kind of protected area and the shortest distance
> from the road. To do this, I need to find the distance from the closest
> vertex in the protected area to the road.
> And here's my problem: If I use the NEIGHBOURFINDER with the roads as
> the base and the areas as candidates, the _distance attribute is
> correct (for instance 88m). But if I use the areas as base, and the
> roads as candidates, the _distance attribute gets a totaly different
> value (0.03m), even though it's the same objects that are identified as
> neighbours.
> Of course, I can solve my problem by using the first approach, which
> gives me the correct result. But does anyone have an explanation to why
> I get different ressults?
That's really odd. I can't reproduce it over here, I set up a basic test
and the distances come out the same.
Could you check the _angle attributes? There should be a difference of
180 degrees between them. What about the _closest_base_x and
_closest_base_y attributes vs the _closest_candidate_x and
_closest_candidate_y attributes? They should be the same values, but
swapped.
What version/build of FME are you using?
--
Hans van der Maarel
Red Geographics
Zevenbergsepoort 44b www.redgeographics.com
4791 AE Klundert [EMAIL PROTECTED]
The Netherlands phone: +31-168-401035
For insights into what's up at Safe Software and what's on the development
horizon, visit Safe's blog at spatial-etl.blogspot.com.
Safe Software has also made slides available that outline enhancements planned
for FME 2007. The slides are from the "Road Ahead" presentation given on Day 2
of the FME Worldwide Users Conference. To view these slides, visit
www.safe.com/2006uc.
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