Re: [OSM-talk] Cannot correct ring self intersection -- josm enhancement needed?
On 13/03/2008, Joerg Ostertag (OSM Munich/Germany) [EMAIL PROTECTED] wrote: Alternatively you could split the way into 2: select the way the node with the 4 segments, then tools-Split Way. I'm not certain whether this will end up with 2 closed ways but I think it should. I have not succeeded at all in splitting closed ways with JOSM. It always says to me that I should select a node from the middle of the road. It seems to think that any node in the closed ring is the starting one. Other way to think is that any node in the ring is in the middle... I have not succeeded in doing this either ... So maybe this is woth an enhancement request for josm ... I found that to split a ring you need to select two nodes then split resulting in two ways, effectively taking a slice out of the ring... d ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
Re: [OSM-talk] Cannot correct ring self intersection
Jon Burgess wrote: On Thu, 2008-03-13 at 00:16 +, Jukka Rahkonen wrote: Hi, I found about 100 topology errors from polygons in Finland with the following work flow: - OSM-data are in PostGIS - I took polygons with topology errors directly into OpenJUMP map with db query: select * from osm_polygon where not isvalid(way); - I used OpenJUMP topology check tool which creates a new point layer showing the exact places of the errors - That layer I converted to gpx and loaded into JOSM. Then I downloaded OSM data An efficient way to do it. I was going to write a script to do the something similar but your approach sounds easier. At least it can be used directly without programming. It is flexible as well, the same system works as well with select * from osm_line where highway='prmary'. around error locations and made corrections. Usually this works rather well. But then I faced such a ring self-intersection that I cannot correct it. It is about a lake that intersects itself but also shares one node with a road. The place is here: http://www.openstreetmap.org/index.html?mlat=61.277669238738454mlon=28.855010608222813zoom=13 I was thinking that I should cut the lake polygon, draw a couple of new nodes and connect the lake together again, but I just cannot split the lake boundary. How should I do it? What I would do is: Use the shift-delete to remove 2 of the 4 segements from the common node. Then create another node some small distance away. Then add the segments back again going via the new node. I got it corrected by doing some shift-deleting and redrawing. Thanks to Jörg who helped by separating the highway for me. Alternatively you could split the way into 2: select the way the node with the 4 segments, then tools-Split Way. I'm not certain whether this will end up with 2 closed ways but I think it should. I have not succeeded at all in splitting closed ways with JOSM. It always says to me that I should select a node from the middle of the road. It seems to think that any node in the closed ring is the starting one. Other way to think is that any node in the ring is in the middle... -Jukka- ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
Re: [OSM-talk] Cannot correct ring self intersection -- josm enhancement needed?
Alternatively you could split the way into 2: select the way the node with the 4 segments, then tools-Split Way. I'm not certain whether this will end up with 2 closed ways but I think it should. I have not succeeded at all in splitting closed ways with JOSM. It always says to me that I should select a node from the middle of the road. It seems to think that any node in the closed ring is the starting one. Other way to think is that any node in the ring is in the middle... I have not succeeded in doing this either ... So maybe this is woth an enhancement request for josm ... -- Jörg (Germany, Munich) http://www.ostertag.name/ irc://irc.oftc.net/#osm Tel.: +49 89 420950304 Skype: JoergOstertag ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
Re: [OSM-talk] Cannot correct ring self intersection -- josmenhancement needed?
I agree, that's a strange restriction in JOSM. (I grab the opportunity to say that I love JOSM and I thank Immanuel Scholz and Frederik Ramm for it.) Lucas De: [EMAIL PROTECTED] en nombre de Joerg Ostertag (OSM Munich/Germany) Enviado el: jue 13/03/2008 9:22 Para: talk@openstreetmap.org Asunto: Re: [OSM-talk] Cannot correct ring self intersection -- josmenhancement needed? Alternatively you could split the way into 2: select the way the node with the 4 segments, then tools-Split Way. I'm not certain whether this will end up with 2 closed ways but I think it should. I have not succeeded at all in splitting closed ways with JOSM. It always says to me that I should select a node from the middle of the road. It seems to think that any node in the closed ring is the starting one. Other way to think is that any node in the ring is in the middle... I have not succeeded in doing this either ... So maybe this is woth an enhancement request for josm ... -- Jörg (Germany, Munich) http://www.ostertag.name/ irc://irc.oftc.net/#osm Tel.: +49 89 420950304 Skype: JoergOstertag ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
Re: [OSM-talk] Cannot correct ring self intersection
Hi, I have not succeeded at all in splitting closed ways with JOSM. It always says to me that I should select a node from the middle of the road. It seems to think that any node in the closed ring is the starting one. Other way to think is that any node in the ring is in the middle... The error message was misleading and has been changed a while ago. If you have a recent JOSM version, the message you'll see is: You must select two or more nodes to split a circular way. Which is quite obvious. If you have a way A-B-C-D-E-A and are told to split that circular way at node C, how could you do it? Bye Frederik ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
Re: [OSM-talk] Cannot correct ring self intersection
Frederik Ramm frederik at remote.org writes: The error message was misleading and has been changed a while ago. If you have a recent JOSM version, the message you'll see is: You must select two or more nodes to split a circular way. I updated my josm-latest to josm-latest, and yes, the error message is much more helpful now. And selecting two nodes and split is not at all too complicated. Which is quite obvious. If you have a way A-B-C-D-E-A and are told to split that circular way at node C, how could you do it? Give scissors to any three-year-old children and you'll see. -Jukka- ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
[OSM-talk] Cannot correct ring self intersection
Hi, I found about 100 topology errors from polygons in Finland with the following work flow: - OSM-data are in PostGIS - I took polygons with topology errors directly into OpenJUMP map with db query: select * from osm_polygon where not isvalid(way); - I used OpenJUMP topology check tool which creates a new point layer showing the exact places of the errors - That layer I converted to gpx and loaded into JOSM. Then I downloaded OSM data around error locations and made corrections. Usually this works rather well. But then I faced such a ring self-intersection that I cannot correct it. It is about a lake that intersects itself but also shares one node with a road. The place is here: http://www.openstreetmap.org/index.html?mlat=61.277669238738454mlon=28.855010608222813zoom=13 I was thinking that I should cut the lake polygon, draw a couple of new nodes and connect the lake together again, but I just cannot split the lake boundary. How should I do it? -Jukka Rahkonen- ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
Re: [OSM-talk] Cannot correct ring self intersection
On Thu, 2008-03-13 at 00:16 +, Jukka Rahkonen wrote: Hi, I found about 100 topology errors from polygons in Finland with the following work flow: - OSM-data are in PostGIS - I took polygons with topology errors directly into OpenJUMP map with db query: select * from osm_polygon where not isvalid(way); - I used OpenJUMP topology check tool which creates a new point layer showing the exact places of the errors - That layer I converted to gpx and loaded into JOSM. Then I downloaded OSM data An efficient way to do it. I was going to write a script to do the something similar but your approach sounds easier. around error locations and made corrections. Usually this works rather well. But then I faced such a ring self-intersection that I cannot correct it. It is about a lake that intersects itself but also shares one node with a road. The place is here: http://www.openstreetmap.org/index.html?mlat=61.277669238738454mlon=28.855010608222813zoom=13 I was thinking that I should cut the lake polygon, draw a couple of new nodes and connect the lake together again, but I just cannot split the lake boundary. How should I do it? What I would do is: Use the shift-delete to remove 2 of the 4 segements from the common node. Then create another node some small distance away. Then add the segments back again going via the new node. Alternatively you could split the way into 2: select the way the node with the 4 segments, then tools-Split Way. I'm not certain whether this will end up with 2 closed ways but I think it should. Jon ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
Re: [OSM-talk] Cannot correct ring self intersection
On Donnerstag 13 März 2008, Jukka Rahkonen wrote: Hi, I found about 100 topology errors from polygons in Finland with the following work flow: - OSM-data are in PostGIS - I took polygons with topology errors directly into OpenJUMP map with db query: select * from osm_polygon where not isvalid(way); - I used OpenJUMP topology check tool which creates a new point layer showing the exact places of the errors - That layer I converted to gpx and loaded into JOSM. Then I downloaded OSM data around error locations and made corrections. Usually this works rather well. But then I faced such a ring self-intersection that I cannot correct it. It is about a lake that intersects itself but also shares one node with a road. The place is here: http://www.openstreetmap.org/index.html?mlat=61.277669238738454mlon=28.855 010608222813zoom=13 I was thinking that I should cut the lake polygon, draw a couple of new nodes and connect the lake together again, but I just cannot split the lake boundary. How should I do it? I did split the street from the wood for you and seperated the two wood peaces. I hope this does help you in editing furter ... -- Jörg (Germany, Munich) http://www.ostertag.name/ irc://irc.oftc.net/#osm Tel.: +49 89 420950304 Skype: JoergOstertag ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
