Larry Becker a écrit : > Does anyone have a link to a web page that talks about the > requirements of undershoot, overshoot, etc.? I'm wondering if you > have, for instance, three lines ending at (within tolerance ) the same > point, how do you decide which point to snap the ends to? Pick one > end randomly, average their positions, or what? To answer, I think one should have to wonder - if it is allowed to move the original geometry - if the extension part should follow exactly the direction of the last segment or if it should go in a direction which minimize its length (hey may be hard to determine with three points !)
most certainly, an interesting problem which is worthy of an effort, the kind of problem where OpenJUMP should be a natural choice ;-) > Should there be options for one layer to be considered the master, and > all others (or editable layers only?) snap to it? I think this one look more like a conflation problem. Michaël > > Larry > > On Thu, Jun 12, 2008 at 12:00 PM, Nacho Uve <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>> wrote: > > I'm very interested about that. I was working on a plugin to > repair connectivity errors (undershoot, overshoot, nodemismatch, > etc...) but I haven't got time to continue with this issue... > maybe in the future I will take again that project. If any person > wants work on that please I would like collaborate... I have some > ideas to do it. > > However, I know that Kosmo has a couple of tools (CAD Tools) to > extend and to shorten lines. > > Best regards, > Nacho > > > 2008/6/12 Martin Davis <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>>: > > JUMP doesn't. JCS I don't think did either. That's just > because it > wasn't a requirement for conflation per se - it's more of a data > cleaning thing. > > Clearly this would be nice to have... all someone has to do is > to write > it.. 8^) > > Stefan Steiniger wrote: > > That is a good question I asked yesterday myself when > writing the > > (other) person an answer on the user list. > > > > @Martin: can you give a comment? Does Jump have tools to remove > > overshoots and undershoots? > > > > Larry Becker schrieb: > >> Fixing undershoots and overshoots for lines seems like one > of the > >> most common and relatively easy to implement features that > a GIS > >> should have. Can it be that we have overlooked this, or is > it a JCS > >> feature that hasn't been ported over yet? > >> > >> Larry > >> > >> On Thu, Jun 12, 2008 at 9:52 AM, Sunburned Surveyor > >> <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> > <mailto:[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>>> > >> wrote: > >> > >> ---------- Forwarded message ---------- > >> From: Assessor <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> > >> <mailto:[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>>> > >> Date: Thu, Jun 12, 2008 at 5:24 AM > >> Subject: OpenJUMP question > >> To: [EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> > >> <mailto:[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>> > >> > >> > >> Sir: > >> > >> > >> > >> I am neither a computer nor GIS expert, although I > eventually can > >> figure out how to solve problems with computers; > sometimes the long > >> way around. > >> > >> > >> > >> PROBLEM: We draw all our maps in AUTOCAD. We have a > fairly good > >> "street map" which is based on our "tax map". The Tax > map is > >> really a > >> collection of about 125 sheets comprising 10,000 > parcels, varying > >> scales, etc. > >> > >> > >> > >> We edge matched them and produced the street map as one > layer but > >> don't know how (or AUTOCAD won't let us) export it as a > polygon > >> shapefile. As it stands now, it comes out as a "line" > >> shapefile. The > >> last edition of the map was sent to a consultant who > converted it > >> to a > >> "polygon" shapefile, probably using an ESRI product. > That costs > >> money > >> that we don't have, and we want to do it a couple times per > >> year. We > >> use the Map with a database that is used for almost > everything > >> that I > >> do as well as many other departments also. > >> > >> > >> > >> Once we get the base layer (polygons) we can do all > kinds of GIS > >> stuff > >> with it, but we don't have a way to solve the only > apparent problem > >> that I think we have; namely: fixing overshoots and > undershoots. > >> > >> > >> > >> No matter how good our line work is in AUTOCAD, when it > comes out > >> as a > >> line shapefile, there are thousands (like about 18,000) > over or > >> undershoots. I have figured out how to fix the > overshoots in > >> OpenJUMP > >> by using the "nodeline" tool, but I don't see how to fix > >> undershoots. > >> The "polygonize" tool works great, but it needs "closed > >> polygons." If > >> I could fix the undershoots, even by making them into > overshoots, > >> I'd > >> be fine. I know ARC has "clean" and "Nodesnap" and > tools that make > >> what I want to do easy. The question is: can this be > done with > >> OpenJUMP or one of its plugins? If so, can you advise? > I have been > >> digging around on the web for days! > >> > >> > >> > >> Sorry for the long email, but I figured more info is > better than > >> less. > >> > >> > >> > >> Thanks. > >> > >> > >> > >> Township of Voorhees > >> > >> > >> > >> > >> > >> Michael C. Kane - Municipal Assessor > >> > >> [EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> > <mailto:[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>> > >> > >> www.voorhees-nj.com <http://www.voorhees-nj.com> > <http://www.voorhees-nj.com> > >> > >> 620 Haddonfield-Berlin Rd. > >> > >> Voorhees, NJ 08043 > >> > >> > >> > >> 856-429-7767 (V) > >> > >> 856-429-5756 (F) > >> > >> > >> > > **************************************************************************************************************************************************************** > >> > >> CONFIDENTIAL AND PROPRIETARY: > >> This email message is intended only for the use of the > individual or > >> entity to which it is addressed and may contain > information that is > >> privileged and confidential; nor is it, unless > specifically stated, > >> intended to be relied upon by any person or persons > other than the > >> individual or entity named above and no warranties or > >> representations > >> are made or intended to persons or entities not named > above. If the > >> reader is not the intended recipient, you are hereby > notified > >> that any > >> dissemination, distribution or copying of this > communication is > >> strictly prohibited. If you have received this > communication in > >> error, please notify us immediately by telephone, > return this > >> message > >> to [EMAIL PROTECTED] and delete all copies. > Thank you. > >> > > -- > Martin Davis > Senior Technical Architect > Refractions Research, Inc. > (250) 383-3022 > > > > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://sourceforge.net/services/buy/index.php > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net> > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://sourceforge.net/services/buy/index.php > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net> > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > > > -- > http://amusingprogrammer.blogspot.com/ > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://sourceforge.net/services/buy/index.php > ------------------------------------------------------------------------ > > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. 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