Hi Chad, The simplest method for this type of thing is to use LineJoiner then the MeasureGenerator transformer to generate the measures. You could then tag them back onto the original geometries using the FeatureMerger. Might not be exactly what you are looking for though.
This task is something that we (ie Safe's Pro Services team) have worked on for quite a few projects recently, creating event tables and measures with client data. If you would like I can have someone call to chat about the methods we used. Contact me off-group at [EMAIL PROTECTED] or via Drew if you'd like to do this. Hope all is going well, Mark Mark Ireland, Senior Product Specialist Safe Software Inc. Surrey, BC, CANADA [EMAIL PROTECTED] http://www.safe.com Solutions for Spatial Data Translation, Distribution and Access --- In [email protected], "NIELSEN Chad M" <[EMAIL PROTECTED]> wrote: > > Hi Mark, > > What I am trying to do is assign route measures for linear referencing. > So, if a bunch of segments have the same route id I want to assign from > and to measures for each segment in the group. The measures are based on > the length of the line, and need to be in some sort of order so that I > can perform dynamic segmentation. > > Actually, I have found a better way to do this than what I was trying to > do yesterday, though I'm still having some problems. What I'm doing is > using Coordinate Fetcher to add the start and end x and y values and in > parallel use LineJoiner, like you mention. I feed both of these into > FeatureMerger with the joined lines as the requestor. I then send this > to ListExploder, which gives me each original feature but instead of the > original geometry I have the joined lines. I can then send this to > LengthToPointCalculator to get the start and end distance. I send this > and the original segments into another FeatureMerger and then I have the > measures on each of the original segments with the original geometry. > This seems to work great for the most part, but I am getting some > records were the begin and end measures are the same, so I am currently > trying to figure out why this is happening. > > Thanks for the info. I was still curious about the list processing even > though I had abandoned that approach. > > Chad Nielsen > > > -----Original Message----- > From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf > Of mark2atsafe > Sent: Thursday, January 04, 2007 4:23 PM > To: [email protected] > Subject: [fme] Re: reordering attribute lists > > > > Hi Chad, > It's tricky because I'm not really sure why you need to do this. > If > it's to join together all lines with a similar ROUTEID then the > LineJoiner might be the very simple answer. > > As you'll have noted it isn't really possible to test within a > list. > What I've done before is count the number of list elements (say > x), > create x copies of the feature using the Cloner, demote > attributes for > each one using the ListIndexer (on the ID created by the Cloner) > and > then compare them using Global variables. Not very pretty, but > it > worked for the example I had. It was for reading a CSV dataset, > and > you can find it on fmepedia at... > > http://www.fmepedia.com/index.php/CSV_Reader_Workspace_3 > <http://www.fmepedia.com/index.php/CSV_Reader_Workspace_3> > > ...really it's almost exactly what you are doing, but using an > ID > number where you are using coordinates. > > Anyway, that method was before looping was permitted. What I'd > do now > is run the feature through a loop in a custom transformer (loop# > = > 1...n) demoting attributes using the ListIndexer (list item = > loop#) > and then do a compare... not too sure how because I've never > needed to > try this yet. > > I hope this helps; but I really can't help feeling they'll be an > easier way to achieve your final aim, if you can explain a > little more. > > Regards, > > Mark > > Mark Ireland, Senior Product Specialist > Safe Software Inc. Surrey, BC, CANADA > [EMAIL PROTECTED] <mailto:support%40safe.com> > http://www.safe.com <http://www.safe.com> > Solutions for Spatial Data Translation, Distribution and Access > > --- In [email protected] <mailto:fme%40yahoogroups.com> , > "NIELSEN Chad M" <chad.m.nielsen@> wrote: > > > > Hello, > > > > In FME Workbench I am trying to figure out how to reorder an > attribute > > list created from aggregated line features such that where > part 0 ends > > part 1 starts and where part 1 ends part 2 starts, and so on. > > > > I am using CoordinateFetcher to add fields that store the > start x, start > > y, end x and end y values for each line feature. I then use > Aggregator > > based on a field called ROUTEID which gives me the unordered > list of > > parts. I want to be able to compare the start/end x/y values > to the > > other elements in the list, if the start x/y of one part > matches the end > > x/y of another part then assign an index value that indicates > the > > relative position in the list. It seems I don't really need to > sort them > > until the new index values are set. Once the new index values > are set I > > can use ListSorter to put the parts in order. > > > > My main problem is figuring out how I can test the elements of > the list > > with other elements in the list then assign a value to an > element in a > > list. I'm not sure if this is possible. Am I way off track > here? Any > > suggestions? > > > > Thanks, > > > > Chad M. Nielsen > > GIS Analyst > > Oregon Department of Transportation > > (503) 986-3163 > > chad.m.nielsen@ > > > 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. Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/fme/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/fme/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
