|
Hi Marion,
Re MatchingFactory...
1) I'm sure you also noticed that matching factory stores
all features in memory, so when you have a "very huge" dataset it will have a
very huge effect on performance.
2) You could probably make sure the number of coords are
the same using EXTRA_VERTEX_TOLERANCE = 0
The CRCCalculator could be used to find matching
features - all features with the same CRC value will have the same geometry
(number of vertices and x/y coords) - of course this doesn't really work with
the 0.3m tolerance, but it would be a much less memory intensive method. A
CoordinateRounder to 3dp would help the process.
Overall I think you'll need to use a combination of
factories - eg Snapping then Matching - and maybe use the CRCCalculator as
a presort to find exact matches beforehand and reduce the number of features you
send into the MatchingFactory.
Just some thoughts - I hope they help
Mark
Mark Ireland, Product Support Engineer
Safe Software Inc. Surrey, BC,
CANADA
[EMAIL PROTECTED] http://www.safe.com
Solutions for Spatial Data Translation,
Distribution and Access
Hi group!
Is there a possibility to detect identical lines?
Identical means: same number of vertices AND xy-coordinate of each point of
the line must not differ more than 0.03 m!!
Of course there is MatchingFactory, but reading
the manual:
MATCHINGFACTORY
INTERIOR_VERTEX_TOLERANCE<tolerance>
Note that the start and end points of features must be identical for a match
to be declared.
1. Also start and end points are allowed to
differ with 0.03 m???
2. Same number of vertices (@NumCoords and
MATCH_ATTRIBUTES)??
3. Performance - we have a very huge
dataset!
Many thanks for all hints,
Marion
Liebe Grüße,
Marion Kinberg
(vormals
Schneider)
++++++++++++++++++++++++++++++++++++++++
.....................
axmann geoinformation ...................
........................... www.axmann.at ........................
tel
+43-2282-5000 ......... [EMAIL PROTECTED]
fax
+43-2282-5001 ..................... [EMAIL PROTECTED]
A2230 Gaenserndorf
(Austria) ........ Kudlichgasse
11
++++++++++++++++++++++++++++++++++++++++
Get the
maximum benefit from your FME, FME Objects, or SpatialDirect via our
Professional Services team. Visit www.safe.com/services for
details.
Get the maximum benefit from your FME, FME Objects, or SpatialDirect via our Professional Services team. Visit www.safe.com/services for details.
YAHOO! GROUPS LINKS
| 