Re: AW: Re: Fwd: [Qgis-user] QGIS Near
On Thu, Oct 28, 2010 at 7:48 AM, Ziegler Stefan stefan.zieg...@bd.so.ch wrote: Hi Giuseppe thanks for looking into this. Do you think it's worth filling out a bug report since the nearestNeighbor method does not the keep the promise or is this the normal behaviour of a spatial index based method? Spatial index uses only the bounding boxes of geometries for two reasons: most importantly the intersection test (used when traversing the data structure) is much faster when compared to testing intersection of real geometry. Second, this would require spatial index to store all geometries - this memory overhead can be significant for bigger layers. So as David already suggested, to ensure you are really working with the nearest geometry, you should check the real distance. Regards Martin ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: AW: Re: Fwd: [Qgis-user] QGIS Near
Hi Martin, On 30/ott/2010, at 11:12, Martin Dobias wonder...@gmail.com wrote: So as David already suggested, to ensure you are really working with the nearest geometry, you should check the real distance. After the David's message I searched for a good solution which can work fine in every cases. So I resolved the issue using the further bbox border as search limit for the second phase. -- Giuseppe Sucameli___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: AW: Re: Fwd: [Qgis-user] QGIS Near
Hi Stefan, On Thu, Oct 28, 2010 at 7:48 AM, Ziegler Stefan stefan.zieg...@bd.so.chwrote: thanks for looking into this. Do you think it's worth filling out a bug report since the nearestNeighbor method does not the keep the promise or is this the normal behaviour of a spatial index based method? I think we should fill a bug report because the nearestNeighbor doesn't work as expected. I don't know if the QgsSpatialIndex can be improved to manage complex geometries, but AFAICS in the few inline comments within the code, in this moment it manages only Points, Lines and Regions (rectangles), so every polygonal geometry must be converted to Regions. This issue could take a lot of time to be fixed, but we can use the ticket to require the documentation about the QgsSpatialIndex class. In this moment it's missing. Cheers. - Originalnachricht - Von: Giuseppe Sucameli sucam...@faunalia.it Gesendet: Mit, 27.10.2010 17:30 An: Ziegler Stefan stefan.zieg...@bd.so.ch Cc: Jim Hammack hamm...@gotslack.org ; qgis-user qgis-user@lists.osgeo.org Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS Near Hi Stefan, your workaround works fine in my case! I looked at the QgsSpatialIndex code and I have bad news... It uses the bounding box of the geometries! This means that your workaround can work in a lot of cases but not in all cases, e.g. if you have more than N geometries (10 considering your workaround), ones inside each other. Cheers. On Tue, Oct 26, 2010 at 6:47 PM, Ziegler Stefan stefan.zieg...@bd.so.ch wrote: Hi Giuseppe I wrote a little workaround. Could you please update to 0.0.6 and check it with your test case? Thanks. regards Stefan mit freundlichem Gruss Stefan Ziegler - Originalnachricht - Von: Giuseppe Sucameli sucam...@faunalia.it Gesendet: Mon, 25.10.2010 14:09 An: Ziegler Stefan stefan.zieg...@bd.so.ch Cc: Jim Hammack hamm...@gotslack.org ; qgis-user qgis-user@lists.osgeo.org Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS Near Hi all, two days ago I wrote a similar plugin for a LD talk in Pisa. I was unaware of the QgsSpatialIndex class (seems there's no documentation about it in the online QGis API pages or maybe I missed it) so I wrote a simple loop to find the closest feature. Now I tried also the Nearest plugin and they are different behavior! See the scheenshots [1] [2]. AFAICS, Nearest select a wrong polygon. I see the plugin's code and I think it could a QgsSpatialIndex bug, but it could be also the normal behaviour (I didn't found its documentation on the API pages so I don't know). I'm going to add my plugin (ClosestFeatureFinded) to the Faunalia repo so you can try it and check the different behavior. I hope this can help to find the bug (if any). If you confirm it, I'll fill a bug report. Cheers. [1] http://img87.imageshack.us/img87/3232/nearest.jpg [2] http://img64.imageshack.us/img64/2066/closest.jpg On Fri, Oct 22, 2010 at 9:19 AM, Ziegler Stefan stefan.zieg...@bd.so.ch wrote: there is some strange behaviour when using it with polygon features (at least I think it's a bit strange): sometimes when you click into a polygon I would expect that it selects the polygon I clicked into but it selects an adjacent polygon. This is probably due to the nearestNeighbor method of the spatial index. Since the two neighboring polygons share a common border the distance would be equal but the spatial index does not check if the coordindates of the mouse click lies within one of the two polygons. regards Stefan mit freundlichem Gruss Stefan Ziegler - Originalnachricht - Von: Jim Hammack hamm...@gotslack.org Gesendet: Don, 21.10.2010 19:20 An: Ziegler Stefan stefan.zieg...@bd.so.ch Cc: qgis-user qgis-user@lists.osgeo.org Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS Near Stefan, I was looking for the same functionality as Zoran so have also been working with your Nearest plugin. It is exactly what I need and seems to work well. Thanks! Jim On 10/20/2010 01:54 PM, Ziegler Stefan wrote: Hi Zoran I had some time left, took all my code snippets and also the one from Carson. Please try the plugin Nearest that should cover your example 1: http://www.catais.org/qgis/plugins.xml regards Stefan -Ursprüngliche Nachricht- Von: Zoran Jankovic [mailto:zoran.janko...@zisis.hr] Gesendet am: Mittwoch, 20. Oktober 2010 19:21 An: qgis-user
Re: AW: Re: Fwd: [Qgis-user] QGIS Near
Isn't a problem like this usually solved with a two-pass method. The first pass uses the spatial index to eliminate all of the features that could not possibly intersect/touch/etc. And then in the second pass, an actual (more expensive) spatial overlay operation is performed on those candidates to determine their true spatial relationships. David. On Thu, Oct 28, 2010 at 10:29 AM, Giuseppe Sucameli sucam...@faunalia.it wrote: Hi Stefan, On Thu, Oct 28, 2010 at 7:48 AM, Ziegler Stefan stefan.zieg...@bd.so.ch wrote: thanks for looking into this. Do you think it's worth filling out a bug report since the nearestNeighbor method does not the keep the promise or is this the normal behaviour of a spatial index based method? I think we should fill a bug report because the nearestNeighbor doesn't work as expected. I don't know if the QgsSpatialIndex can be improved to manage complex geometries, but AFAICS in the few inline comments within the code, in this moment it manages only Points, Lines and Regions (rectangles), so every polygonal geometry must be converted to Regions. This issue could take a lot of time to be fixed, but we can use the ticket to require the documentation about the QgsSpatialIndex class. In this moment it's missing. Cheers. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
AW: AW: Re: Fwd: [Qgis-user] QGIS Near
Hi Giuseppe thanks for looking into this. Do you think it's worth filling out a bug report since the nearestNeighbor method does not the keep the promise or is this the normal behaviour of a spatial index based method? regards Stefan mit freundlichem Gruss Stefan Ziegler - Originalnachricht - Von: Giuseppe Sucameli sucam...@faunalia.it Gesendet: Mit, 27.10.2010 17:30 An: Ziegler Stefan stefan.zieg...@bd.so.ch Cc: Jim Hammack hamm...@gotslack.org ; qgis-user qgis-user@lists.osgeo.org Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS Near Hi Stefan, your workaround works fine in my case! I looked at the QgsSpatialIndex code and I have bad news... It uses the bounding box of the geometries! This means that your workaround can work in a lot of cases but not in all cases, e.g. if you have more than N geometries (10 considering your workaround), ones inside each other. Cheers. On Tue, Oct 26, 2010 at 6:47 PM, Ziegler Stefan stefan.zieg...@bd.so.ch wrote: Hi Giuseppe I wrote a little workaround. Could you please update to 0.0.6 and check it with your test case? Thanks. regards Stefan mit freundlichem Gruss Stefan Ziegler - Originalnachricht - Von: Giuseppe Sucameli sucam...@faunalia.it Gesendet: Mon, 25.10.2010 14:09 An: Ziegler Stefan stefan.zieg...@bd.so.ch Cc: Jim Hammack hamm...@gotslack.org ; qgis-user qgis-user@lists.osgeo.org Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS Near Hi all, two days ago I wrote a similar plugin for a LD talk in Pisa. I was unaware of the QgsSpatialIndex class (seems there's no documentation about it in the online QGis API pages or maybe I missed it) so I wrote a simple loop to find the closest feature. Now I tried also the Nearest plugin and they are different behavior! See the scheenshots [1] [2]. AFAICS, Nearest select a wrong polygon. I see the plugin's code and I think it could a QgsSpatialIndex bug, but it could be also the normal behaviour (I didn't found its documentation on the API pages so I don't know). I'm going to add my plugin (ClosestFeatureFinded) to the Faunalia repo so you can try it and check the different behavior. I hope this can help to find the bug (if any). If you confirm it, I'll fill a bug report. Cheers. [1] http://img87.imageshack.us/img87/3232/nearest.jpg [2] http://img64.imageshack.us/img64/2066/closest.jpg On Fri, Oct 22, 2010 at 9:19 AM, Ziegler Stefan stefan.zieg...@bd.so.ch wrote: there is some strange behaviour when using it with polygon features (at least I think it's a bit strange): sometimes when you click into a polygon I would expect that it selects the polygon I clicked into but it selects an adjacent polygon. This is probably due to the nearestNeighbor method of the spatial index. Since the two neighboring polygons share a common border the distance would be equal but the spatial index does not check if the coordindates of the mouse click lies within one of the two polygons. regards Stefan mit freundlichem Gruss Stefan Ziegler - Originalnachricht - Von: Jim Hammack hamm...@gotslack.org Gesendet: Don, 21.10.2010 19:20 An: Ziegler Stefan stefan.zieg...@bd.so.ch Cc: qgis-user qgis-user@lists.osgeo.org Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS Near Stefan, I was looking for the same functionality as Zoran so have also been working with your Nearest plugin. It is exactly what I need and seems to work well. Thanks! Jim On 10/20/2010 01:54 PM, Ziegler Stefan wrote: Hi Zoran I had some time left, took all my code snippets and also the one from Carson. Please try the plugin Nearest that should cover your example 1: http://www.catais.org/qgis/plugins.xml regards Stefan -Ursprüngliche Nachricht- Von: Zoran Jankovic [mailto:zoran.janko...@zisis.hr] Gesendet am: Mittwoch, 20. Oktober 2010 19:21 An: qgis-user Betreff: Re: Fwd: [Qgis-user] QGIS Near Hi Joe, On Wed, Oct 20, 2010 at 5:06 PM, Joe Larson joela...@gmail.com wrote: Does the function 'snapWithContext' http://doc.qgis.org/head/classQgsVectorLayer.html#733b974dce13d587e05cf3d4fc24f208 which Snaps to segment or vertex within given tolerance. seem like what you're looking for? I came across it while trying to get Quantum
AW: AW: Re: Fwd: [Qgis-user] QGIS Near
Hi I'm also quite sure there is some unexpected behaviour in the QgsSpatialIndex.nearestNeighbor() method. The two screenshots look a bit like it has something to do with the bounding box? regards Stefan mit freundlichem Gruss Stefan Ziegler - Originalnachricht - Von: Giuseppe Sucameli sucam...@faunalia.it Gesendet: Mon, 25.10.2010 14:09 An: Ziegler Stefan stefan.zieg...@bd.so.ch Cc: Jim Hammack hamm...@gotslack.org ; qgis-user qgis-user@lists.osgeo.org Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS Near Hi all, two days ago I wrote a similar plugin for a LD talk in Pisa. I was unaware of the QgsSpatialIndex class (seems there's no documentation about it in the online QGis API pages or maybe I missed it) so I wrote a simple loop to find the closest feature. Now I tried also the Nearest plugin and they are different behavior! See the scheenshots [1] [2]. AFAICS, Nearest select a wrong polygon. I see the plugin's code and I think it could a QgsSpatialIndex bug, but it could be also the normal behaviour (I didn't found its documentation on the API pages so I don't know). I'm going to add my plugin (ClosestFeatureFinded) to the Faunalia repo so you can try it and check the different behavior. I hope this can help to find the bug (if any). If you confirm it, I'll fill a bug report. Cheers. [1] http://img87.imageshack.us/img87/3232/nearest.jpg [2] http://img64.imageshack.us/img64/2066/closest.jpg On Fri, Oct 22, 2010 at 9:19 AM, Ziegler Stefan stefan.zieg...@bd.so.ch wrote: there is some strange behaviour when using it with polygon features (at least I think it's a bit strange): sometimes when you click into a polygon I would expect that it selects the polygon I clicked into but it selects an adjacent polygon. This is probably due to the nearestNeighbor method of the spatial index. Since the two neighboring polygons share a common border the distance would be equal but the spatial index does not check if the coordindates of the mouse click lies within one of the two polygons. regards Stefan mit freundlichem Gruss Stefan Ziegler - Originalnachricht - Von: Jim Hammack hamm...@gotslack.org Gesendet: Don, 21.10.2010 19:20 An: Ziegler Stefan stefan.zieg...@bd.so.ch Cc: qgis-user qgis-user@lists.osgeo.org Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS Near Stefan, I was looking for the same functionality as Zoran so have also been working with your Nearest plugin. It is exactly what I need and seems to work well. Thanks! Jim On 10/20/2010 01:54 PM, Ziegler Stefan wrote: Hi Zoran I had some time left, took all my code snippets and also the one from Carson. Please try the plugin Nearest that should cover your example 1: http://www.catais.org/qgis/plugins.xml regards Stefan -Ursprüngliche Nachricht- Von: Zoran Jankovic [mailto:zoran.janko...@zisis.hr] Gesendet am: Mittwoch, 20. Oktober 2010 19:21 An: qgis-user Betreff: Re: Fwd: [Qgis-user] QGIS Near Hi Joe, On Wed, Oct 20, 2010 at 5:06 PM, Joe Larson joela...@gmail.com wrote: Does the function 'snapWithContext' http://doc.qgis.org/head/classQgsVectorLayer.html#733b974dce13d587e05cf3d4fc24f208 which Snaps to segment or vertex within given tolerance. seem like what you're looking for? I came across it while trying to get Quantum Navigator working recently...seemed relative, but I'm no expert! This is similar to the mentioned solution with selecting by radius, or changing the tolerance of ID tool. Close, but no cigar. Since this is not very urgent, I've decided to continue pursuing that outlined solution Carson gave, and write a plugin i Python based on that. Since I actually never used Python before, it may take a while, but hey, I get to learn sth. new :-). I never got the word back from Carson, has he developed anything along these lines, but I have to presume he didn't... Anyone interested in joning me, or even earning some money, is still invited to jump on board. My GIS implementation project is well on the way, and it seems there'll even be some money involved :-). Zoran ~joe On Tue, Oct 19, 2010 at 9:55 AM, Andreas Neumann
AW: AW: Re: Fwd: [Qgis-user] QGIS Near
Hi Giuseppe I wrote a little workaround. Could you please update to 0.0.6 and check it with your test case? Thanks. regards Stefan mit freundlichem Gruss Stefan Ziegler - Originalnachricht - Von: Giuseppe Sucameli sucam...@faunalia.it Gesendet: Mon, 25.10.2010 14:09 An: Ziegler Stefan stefan.zieg...@bd.so.ch Cc: Jim Hammack hamm...@gotslack.org ; qgis-user qgis-user@lists.osgeo.org Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS Near Hi all, two days ago I wrote a similar plugin for a LD talk in Pisa. I was unaware of the QgsSpatialIndex class (seems there's no documentation about it in the online QGis API pages or maybe I missed it) so I wrote a simple loop to find the closest feature. Now I tried also the Nearest plugin and they are different behavior! See the scheenshots [1] [2]. AFAICS, Nearest select a wrong polygon. I see the plugin's code and I think it could a QgsSpatialIndex bug, but it could be also the normal behaviour (I didn't found its documentation on the API pages so I don't know). I'm going to add my plugin (ClosestFeatureFinded) to the Faunalia repo so you can try it and check the different behavior. I hope this can help to find the bug (if any). If you confirm it, I'll fill a bug report. Cheers. [1] http://img87.imageshack.us/img87/3232/nearest.jpg [2] http://img64.imageshack.us/img64/2066/closest.jpg On Fri, Oct 22, 2010 at 9:19 AM, Ziegler Stefan stefan.zieg...@bd.so.ch wrote: there is some strange behaviour when using it with polygon features (at least I think it's a bit strange): sometimes when you click into a polygon I would expect that it selects the polygon I clicked into but it selects an adjacent polygon. This is probably due to the nearestNeighbor method of the spatial index. Since the two neighboring polygons share a common border the distance would be equal but the spatial index does not check if the coordindates of the mouse click lies within one of the two polygons. regards Stefan mit freundlichem Gruss Stefan Ziegler - Originalnachricht - Von: Jim Hammack hamm...@gotslack.org Gesendet: Don, 21.10.2010 19:20 An: Ziegler Stefan stefan.zieg...@bd.so.ch Cc: qgis-user qgis-user@lists.osgeo.org Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS Near Stefan, I was looking for the same functionality as Zoran so have also been working with your Nearest plugin. It is exactly what I need and seems to work well. Thanks! Jim On 10/20/2010 01:54 PM, Ziegler Stefan wrote: Hi Zoran I had some time left, took all my code snippets and also the one from Carson. Please try the plugin Nearest that should cover your example 1: http://www.catais.org/qgis/plugins.xml regards Stefan -Ursprüngliche Nachricht- Von: Zoran Jankovic [mailto:zoran.janko...@zisis.hr] Gesendet am: Mittwoch, 20. Oktober 2010 19:21 An: qgis-user Betreff: Re: Fwd: [Qgis-user] QGIS Near Hi Joe, On Wed, Oct 20, 2010 at 5:06 PM, Joe Larson joela...@gmail.com wrote: Does the function 'snapWithContext' http://doc.qgis.org/head/classQgsVectorLayer.html#733b974dce13d587e05cf3d4fc24f208 which Snaps to segment or vertex within given tolerance. seem like what you're looking for? I came across it while trying to get Quantum Navigator working recently...seemed relative, but I'm no expert! This is similar to the mentioned solution with selecting by radius, or changing the tolerance of ID tool. Close, but no cigar. Since this is not very urgent, I've decided to continue pursuing that outlined solution Carson gave, and write a plugin i Python based on that. Since I actually never used Python before, it may take a while, but hey, I get to learn sth. new :-). I never got the word back from Carson, has he developed anything along these lines, but I have to presume he didn't... Anyone interested in joning me, or even earning some money, is still invited to jump on board. My GIS implementation project is well on the way, and it seems there'll even be some money involved :-). Zoran ~joe On Tue, Oct 19, 2010 at 9:55 AM, Andreas Neumann a.neumann at carto.netwrote: Hi Zoran
Re: AW: Re: Fwd: [Qgis-user] QGIS Near
Hi all, two days ago I wrote a similar plugin for a LD talk in Pisa. I was unaware of the QgsSpatialIndex class (seems there's no documentation about it in the online QGis API pages or maybe I missed it) so I wrote a simple loop to find the closest feature. Now I tried also the Nearest plugin and they are different behavior! See the scheenshots [1] [2]. AFAICS, Nearest select a wrong polygon. I see the plugin's code and I think it could a QgsSpatialIndex bug, but it could be also the normal behaviour (I didn't found its documentation on the API pages so I don't know). I'm going to add my plugin (ClosestFeatureFinded) to the Faunalia repo so you can try it and check the different behavior. I hope this can help to find the bug (if any). If you confirm it, I'll fill a bug report. Cheers. [1] http://img87.imageshack.us/img87/3232/nearest.jpg [2] http://img64.imageshack.us/img64/2066/closest.jpg On Fri, Oct 22, 2010 at 9:19 AM, Ziegler Stefan stefan.zieg...@bd.so.chwrote: there is some strange behaviour when using it with polygon features (at least I think it's a bit strange): sometimes when you click into a polygon I would expect that it selects the polygon I clicked into but it selects an adjacent polygon. This is probably due to the nearestNeighbor method of the spatial index. Since the two neighboring polygons share a common border the distance would be equal but the spatial index does not check if the coordindates of the mouse click lies within one of the two polygons. regards Stefan mit freundlichem Gruss Stefan Ziegler - Originalnachricht - Von: Jim Hammack hamm...@gotslack.org Gesendet: Don, 21.10.2010 19:20 An: Ziegler Stefan stefan.zieg...@bd.so.ch Cc: qgis-user qgis-user@lists.osgeo.org Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS Near Stefan, I was looking for the same functionality as Zoran so have also been working with your Nearest plugin. It is exactly what I need and seems to work well. Thanks! Jim On 10/20/2010 01:54 PM, Ziegler Stefan wrote: Hi Zoran I had some time left, took all my code snippets and also the one from Carson. Please try the plugin Nearest that should cover your example 1: http://www.catais.org/qgis/plugins.xml regards Stefan -Ursprüngliche Nachricht- Von: Zoran Jankovic [mailto:zoran.janko...@zisis.hr] Gesendet am: Mittwoch, 20. Oktober 2010 19:21 An: qgis-user Betreff: Re: Fwd: [Qgis-user] QGIS Near Hi Joe, On Wed, Oct 20, 2010 at 5:06 PM, Joe Larson joela...@gmail.com wrote: Does the function 'snapWithContext' http://doc.qgis.org/head/classQgsVectorLayer.html#733b974dce13d587e05cf3d4fc24f208 which Snaps to segment or vertex within given tolerance. seem like what you're looking for? I came across it while trying to get Quantum Navigator working recently...seemed relative, but I'm no expert! This is similar to the mentioned solution with selecting by radius, or changing the tolerance of ID tool. Close, but no cigar. Since this is not very urgent, I've decided to continue pursuing that outlined solution Carson gave, and write a plugin i Python based on that. Since I actually never used Python before, it may take a while, but hey, I get to learn sth. new :-). I never got the word back from Carson, has he developed anything along these lines, but I have to presume he didn't... Anyone interested in joning me, or even earning some money, is still invited to jump on board. My GIS implementation project is well on the way, and it seems there'll even be some money involved :-). Zoran ~joe On Tue, Oct 19, 2010 at 9:55 AM, Andreas Neumann a.neumann at carto.netwrote: Hi Zoran, I believe the infrastructure of what you want is already wihtin the selection and identify tools in QGIS. Isn't this almost implemented in the current identify tool? It sort of is, but not completely. Identify will ID all the features within certain radios (percentage of extent), but it will ID _all_ of the features within this radius. I only need the nearest, no matter
AW: AW: Re: Fwd: [Qgis-user] QGIS Near
Hi there is some strange behaviour when using it with polygon features (at least I think it's a bit strange): sometimes when you click into a polygon I would expect that it selects the polygon I clicked into but it selects an adjacent polygon. This is probably due to the nearestNeighbor method of the spatial index. Since the two neighboring polygons share a common border the distance would be equal but the spatial index does not check if the coordindates of the mouse click lies within one of the two polygons. regards Stefan mit freundlichem Gruss Stefan Ziegler - Originalnachricht - Von: Jim Hammack hamm...@gotslack.org Gesendet: Don, 21.10.2010 19:20 An: Ziegler Stefan stefan.zieg...@bd.so.ch Cc: qgis-user qgis-user@lists.osgeo.org Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS Near Stefan, I was looking for the same functionality as Zoran so have also been working with your Nearest plugin. It is exactly what I need and seems to work well. Thanks! Jim On 10/20/2010 01:54 PM, Ziegler Stefan wrote: Hi Zoran I had some time left, took all my code snippets and also the one from Carson. Please try the plugin Nearest that should cover your example 1: http://www.catais.org/qgis/plugins.xml regards Stefan -Ursprüngliche Nachricht- Von: Zoran Jankovic [mailto:zoran.janko...@zisis.hr] Gesendet am: Mittwoch, 20. Oktober 2010 19:21 An: qgis-user Betreff: Re: Fwd: [Qgis-user] QGIS Near Hi Joe, On Wed, Oct 20, 2010 at 5:06 PM, Joe Larson joela...@gmail.com wrote: Does the function 'snapWithContext' http://doc.qgis.org/head/classQgsVectorLayer.html#733b974dce13d587e05cf3d4fc24f208 which Snaps to segment or vertex within given tolerance. seem like what you're looking for? I came across it while trying to get Quantum Navigator working recently...seemed relative, but I'm no expert! This is similar to the mentioned solution with selecting by radius, or changing the tolerance of ID tool. Close, but no cigar. Since this is not very urgent, I've decided to continue pursuing that outlined solution Carson gave, and write a plugin i Python based on that. Since I actually never used Python before, it may take a while, but hey, I get to learn sth. new :-). I never got the word back from Carson, has he developed anything along these lines, but I have to presume he didn't... Anyone interested in joning me, or even earning some money, is still invited to jump on board. My GIS implementation project is well on the way, and it seems there'll even be some money involved :-). Zoran ~joe On Tue, Oct 19, 2010 at 9:55 AM, Andreas Neumann a.neumann at carto.netwrote: Hi Zoran, I believe the infrastructure of what you want is already wihtin the selection and identify tools in QGIS. Isn't this almost implemented in the current identify tool? It sort of is, but not completely. Identify will ID all the features within certain radios (percentage of extent), but it will ID _all_ of the features within this radius. I only need the nearest, no matter how far away... Let us say it is, for simplicity, within current extent. The current identify tool selects near or close by features within a certain tolerance. This tolerance can be set in Options -- Map tools search radius. I believe it currently only effects the identify tool. Do you want the same tolerance also be used for the click-selection tool
Re: AW: AW: Re: Fwd: [Qgis-user] QGIS Near
Stefan, Yes, I see that now. I was using only points before and never tried clicking inside a polygon. I wouldn't think that would be a very common event, though. Jim On 10/22/2010 02:19 AM, Ziegler Stefan wrote: Hi there is some strange behaviour when using it with polygon features (at least I think it's a bit strange): sometimes when you click into a polygon I would expect that it selects the polygon I clicked into but it selects an adjacent polygon. This is probably due to the nearestNeighbor method of the spatial index. Since the two neighboring polygons share a common border the distance would be equal but the spatial index does not check if the coordindates of the mouse click lies within one of the two polygons. regards Stefan mit freundlichem Gruss Stefan Ziegler - Originalnachricht - Von: "Jim Hammack" hamm...@gotslack.org Gesendet: Don, 21.10.2010 19:20 An: "Ziegler Stefan" stefan.zieg...@bd.so.ch Cc: qgis-user qgis-user@lists.osgeo.org Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS "Near" Stefan, I was looking for the same functionality as Zoran so have also been working with your "Nearest" plugin. It is exactly what I need and seems to work well. Thanks! Jim On 10/20/2010 01:54 PM, Ziegler Stefan wrote: Hi Zoran I had some time left, took all my code snippets and also the one from Carson. Please try the plugin "Nearest" that should cover your example 1: http://www.catais.org/qgis/plugins.xml regards Stefan -Ursprngliche Nachricht- Von: Zoran Jankovic [mailto:zoran.janko...@zisis.hr] Gesendet am: Mittwoch, 20. Oktober 2010 19:21 An: qgis-user Betreff: Re: Fwd: [Qgis-user] QGIS "Near" Hi Joe, On Wed, Oct 20, 2010 at 5:06 PM, Joe Larson joela...@gmail.com wrote: Does the function 'snapWithContext' http://doc.qgis.org/head/classQgsVectorLayer.html#733b974dce13d587e05cf3d4fc24f208 which "Snaps to segment or vertex within given tolerance." seem like what you're looking for? I came across it while trying to get Quantum Navigator working recently...seemed relative, but I'm no expert! This is similar to the mentioned solution with selecting by radius, or changing the tolerance of ID tool. Close, but no cigar. Since this is not very urgent, I've decided to continue pursuing that outlined solution Carson gave, and write a plugin i Python based on that. Since I actually never used Python before, it may take a while, but hey, I get to learn sth. new :-). I never got the word back from Carson, has he developed anything along these lines, but I have to presume he didn't... Anyone interested in joning me, or even earning some money, is still invited to jump on board. My GIS implementation project is well on the way, and it seems there'll even be some money involved :-). Zoran ~joe On Tue, Oct 19, 2010 at 9:55 AM, Andreas Neumann a.neumann at carto.netwrote: Hi Zoran, I believe the infrastructure of what you want is already wihtin the selection and identify tools in QGIS. Isn't this almost implemented in the current identify tool? It sort of is, but not completely. Identify will ID all the features within certain radios (percentage of extent), but it will ID _all_ of the features within this radius. I only need the nearest, no matter how far away... Let us say it is, for simplicity, within current extent. The current identify tool selects "near" or
AW: Re: Fwd: [Qgis-user] QGIS Near
Hi Zoran As I can see the main stuff is in featurefindertool.py? And it works through all the features in the selected layer every time? Yes, the interesting stuff is in featurefindertool.py. Yes, it works through all the features in the selected layer. But, I really do not have that many features, and it takes 2-3 seconds to find the nearest feature on my, not so very new laptop, in a layer with cca 4200 point features.Ok, this is due to the spatial index that is build everytime you click on the map. I changed this behaviour; the index is build only for the first time (or when you change the current layer of course). It takes 3 secondes for 50'000 point features and 40 seconds for 600'000 point features for the first search (on our server). The second click/search is just real-time. Please update the plugin and try it and let me know. regards Stefan On Wed, Oct 20, 2010 at 8:54 PM, Ziegler Stefan stefan.zieg...@bd.so.ch wrote: Hi Zoran I had some time left, took all my code snippets and also the one from Carson. Please try the plugin Nearest that should cover your example 1: http://www.catais.org/qgis/plugins.xml regards Stefan -Ursprüngliche Nachricht- Von: Zoran Jankovic [mailto:zoran.janko...@zisis.hr] Gesendet am: Mittwoch, 20. Oktober 2010 19:21 An: qgis-user Betreff: Re: Fwd: [Qgis-user] QGIS Near Hi Joe, On Wed, Oct 20, 2010 at 5:06 PM, Joe Larson joela...@gmail.com wrote: Does the function 'snapWithContext' http://doc.qgis.org/head/classQgsVectorLayer.html#733b974dce13d587e05cf3d4fc24f208 which Snaps to segment or vertex within given tolerance. seem like what you're looking for? I came across it while trying to get Quantum Navigator working recently...seemed relative, but I'm no expert! This is similar to the mentioned solution with selecting by radius, or changing the tolerance of ID tool. Close, but no cigar. Since this is not very urgent, I've decided to continue pursuing that outlined solution Carson gave, and write a plugin i Python based on that. Since I actually never used Python before, it may take a while, but hey, I get to learn sth. new :-). I never got the word back from Carson, has he developed anything along these lines, but I have to presume he didn't... Anyone interested in joning me, or even earning some money, is still invited to jump on board. My GIS implementation project is well on the way, and it seems there'll even be some money involved :-). Zoran ~joe On Tue, Oct 19, 2010 at 9:55 AM, Andreas Neumann a.neumann at carto.netwrote: Hi Zoran, I believe the infrastructure of what you want is already wihtin the selection and identify tools in QGIS. Isn't this almost implemented in the current identify tool? It sort of is, but not completely. Identify will ID all the features within certain radios (percentage of extent), but it will ID _all_ of the features within this radius. I only need the nearest, no matter how far away... Let us say it is, for simplicity, within current extent. The current identify tool selects near or close by features within a certain tolerance. This tolerance can be set in Options -- Map tools search radius. I believe it currently only effects the identify tool. Do you want the same tolerance also be used for the click-selection tool? Look above. This could be useful, but it is not the functionality I'm currently looking after. Are you also aware that in QGIS 1.6 there are new selection tools? * by click * by rectangle * by polygon * by freehand * by radius Yup, these are great, but they all select _multiple_ features within radius, rectangle, etc. Maybe this also helps to address your needs? Of course you can combine it with previous selections by pressing the ctrl key. BR, --- Zoran Jankovic ZIS-Izrada softvera i savjetovanje / ZIS - Software Development and Consulting http://www.zisis.hr M: 00 385 98 682 902 T: 00 385 44 683 374 A. Senoe 4 44320 Kutina Croatia ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: AW: Re: Fwd: [Qgis-user] QGIS Near
Hi, I have installed the plugin on qgis trunk and Ubuntu 10.04, and now every time I exit qgis I get the following Traceback (most recent call last): File /usr/lib/python2.6/dist-packages/qgis/utils.py, line 187, in unloadPlugin plugins[packageName].unload() File /home/gio/.qgis/python/plugins/nearest/nearest.py, line 102, in unload QObject.disconnect(self.tool, SIGNAL(featureFound()), self.selectFeature) AttributeError: Nearest instance has no attribute 'tool' cheers -- Giovanni -- On Thu, 2010-10-21 at 10:22 +0200, Ziegler Stefan wrote: Hi Zoran As I can see the main stuff is in featurefindertool.py? And it works through all the features in the selected layer every time? Yes, the interesting stuff is in featurefindertool.py. Yes, it works through all the features in the selected layer. But, I really do not have that many features, and it takes 2-3 seconds to find the nearest feature on my, not so very new laptop, in a layer with cca 4200 point features.Ok, this is due to the spatial index that is build everytime you click on the map. I changed this behaviour; the index is build only for the first time (or when you change the current layer of course). It takes 3 secondes for 50'000 point features and 40 seconds for 600'000 point features for the first search (on our server). The second click/search is just real-time. Please update the plugin and try it and let me know. regards Stefan On Wed, Oct 20, 2010 at 8:54 PM, Ziegler Stefan stefan.zieg...@bd.so.ch wrote: Hi Zoran I had some time left, took all my code snippets and also the one from Carson. Please try the plugin Nearest that should cover your example 1: http://www.catais.org/qgis/plugins.xml regards Stefan -Ursprüngliche Nachricht- Von: Zoran Jankovic [mailto:zoran.janko...@zisis.hr] Gesendet am: Mittwoch, 20. Oktober 2010 19:21 An: qgis-user Betreff: Re: Fwd: [Qgis-user] QGIS Near Hi Joe, On Wed, Oct 20, 2010 at 5:06 PM, Joe Larson joela...@gmail.com wrote: Does the function 'snapWithContext' http://doc.qgis.org/head/classQgsVectorLayer.html#733b974dce13d587e05cf3d4fc24f208 which Snaps to segment or vertex within given tolerance. seem like what you're looking for? I came across it while trying to get Quantum Navigator working recently...seemed relative, but I'm no expert! This is similar to the mentioned solution with selecting by radius, or changing the tolerance of ID tool. Close, but no cigar. Since this is not very urgent, I've decided to continue pursuing that outlined solution Carson gave, and write a plugin i Python based on that. Since I actually never used Python before, it may take a while, but hey, I get to learn sth. new :-). I never got the word back from Carson, has he developed anything along these lines, but I have to presume he didn't... Anyone interested in joning me, or even earning some money, is still invited to jump on board. My GIS implementation project is well on the way, and it seems there'll even be some money involved :-). Zoran ~joe On Tue, Oct 19, 2010 at 9:55 AM, Andreas Neumann a.neumann at carto.netwrote: Hi Zoran, I believe the infrastructure of what you want is already wihtin the selection and identify tools in QGIS. Isn't this almost implemented in the current identify tool? It sort of is, but not completely. Identify will ID all the features within certain radios (percentage of extent), but it will ID _all_ of the features within this radius. I only need the nearest, no matter how far away... Let us say it is, for simplicity, within current extent. The current identify tool selects near or close by features within a certain tolerance. This tolerance can be set in Options -- Map tools search radius. I believe it currently only effects the identify tool. Do you want the same tolerance also be used for the click-selection tool? Look above. This could be useful, but it is not the functionality I'm currently looking after. Are you also aware that in QGIS 1.6 there are new selection tools? * by click * by rectangle * by polygon * by freehand * by radius Yup, these are great, but they all select _multiple_ features within radius, rectangle, etc. Maybe this also helps to address your needs? Of course you can combine it with previous selections by pressing the ctrl key. BR, --- Zoran Jankovic ZIS-Izrada softvera i
AW: Re: AW: Re: Fwd: [Qgis-user] QGIS Near
Shame on me... Please update the plugin (0.0.3) and try again. regards Stefan -Ursprüngliche Nachricht- Von: Ricardo Filipe Soares Garcia da [mailto:ricardo.garcia.si...@gmail.com] Gesendet am: Donnerstag, 21. Oktober 2010 15:19 An: qgis-user Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS Near It is happening to me as well (Ubuntu 10.10, Qgis 1.5 from ubuntugis-unstable ppa) I have installed the plugin on qgis trunk and Ubuntu 10.04, and now every time I exit qgis I get the following Traceback (most recent call last): File /usr/lib/python2.6/dist-packages/qgis/utils.py, line 187, in unloadPlugin plugins[packageName].unload() File /home/gio/.qgis/python/plugins/nearest/nearest.py, line 102, in unload QObject.disconnect(self.tool, SIGNAL(featureFound()), self.selectFeature) AttributeError: Nearest instance has no attribute 'tool' -- ___ ___ __ Ricardo Garcia Silva ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: AW: Re: Fwd: [Qgis-user] QGIS Near
Stefan, I was looking for the same functionality as Zoran so have also been working with your "Nearest" plugin. It is exactly what I need and seems to work well. Thanks! Jim On 10/20/2010 01:54 PM, Ziegler Stefan wrote: Hi Zoran I had some time left, took all my code snippets and also the one from Carson. Please try the plugin "Nearest" that should cover your example 1: http://www.catais.org/qgis/plugins.xml regards Stefan -Ursprngliche Nachricht- Von: Zoran Jankovic [mailto:zoran.janko...@zisis.hr] Gesendet am: Mittwoch, 20. Oktober 2010 19:21 An: qgis-user Betreff: Re: Fwd: [Qgis-user] QGIS "Near" Hi Joe, On Wed, Oct 20, 2010 at 5:06 PM, Joe Larson joela...@gmail.com wrote: Does the function 'snapWithContext' http://doc.qgis.org/head/classQgsVectorLayer.html#733b974dce13d587e05cf3d4fc24f208 which "Snaps to segment or vertex within given tolerance." seem like what you're looking for? I came across it while trying to get Quantum Navigator working recently...seemed relative, but I'm no expert! This is similar to the mentioned solution with selecting by radius, or changing the tolerance of ID tool. Close, but no cigar. Since this is not very urgent, I've decided to continue pursuing that outlined solution Carson gave, and write a plugin i Python based on that. Since I actually never used Python before, it may take a while, but hey, I get to learn sth. new :-). I never got the word back from Carson, has he developed anything along these lines, but I have to presume he didn't... Anyone interested in joning me, or even earning some money, is still invited to jump on board. My GIS implementation project is well on the way, and it seems there'll even be some money involved :-). Zoran ~joe On Tue, Oct 19, 2010 at 9:55 AM, Andreas Neumann a.neumann at carto.netwrote: Hi Zoran, I believe the infrastructure of what you want is already wihtin the selection and identify tools in QGIS. Isn't this almost implemented in the current identify tool? It sort of is, but not completely. Identify will ID all the features within certain radios (percentage of extent), but it will ID _all_ of the features within this radius. I only need the nearest, no matter how far away... Let us say it is, for simplicity, within current extent. The current identify tool selects "near" or "close by" features within a certain tolerance. This tolerance can be set in "Options" -- "Map tools" "search radius". I believe it currently only effects the identify tool. Do you want the same tolerance also be used for the click-selection tool? Look above. This could be useful, but it is not the functionality I'm currently looking after. Are you also aware that in QGIS 1.6 there are new selection tools? * by click * by rectangle * by polygon * by freehand * by radius Yup, these are great, but they all select _multiple_ features within radius, rectangle, etc. Maybe this also helps to address your needs? Of course you can combine it with previous selections by pressing the ctrl key.
AW: Re: Fwd: [Qgis-user] QGIS Near
Hi Zoran I had some time left, took all my code snippets and also the one from Carson. Please try the plugin Nearest that should cover your example 1: http://www.catais.org/qgis/plugins.xml regards Stefan -Ursprüngliche Nachricht- Von: Zoran Jankovic [mailto:zoran.janko...@zisis.hr] Gesendet am: Mittwoch, 20. Oktober 2010 19:21 An: qgis-user Betreff: Re: Fwd: [Qgis-user] QGIS Near Hi Joe, On Wed, Oct 20, 2010 at 5:06 PM, Joe Larson joela...@gmail.com wrote: Does the function 'snapWithContext' http://doc.qgis.org/head/classQgsVectorLayer.html#733b974dce13d587 e05cf3d4fc24f208 which Snaps to segment or vertex within given tolerance. seem like what you're looking for? I came across it while trying to get Quantum Navigator working recently...seemed relative, but I'm no expert! This is similar to the mentioned solution with selecting by radius, or changing the tolerance of ID tool. Close, but no cigar. Since this is not very urgent, I've decided to continue pursuing that outlined solution Carson gave, and write a plugin i Python based on that. Since I actually never used Python before, it may take a while, but hey, I get to learn sth. new :-). I never got the word back from Carson, has he developed anything along these lines, but I have to presume he didn't... Anyone interested in joning me, or even earning some money, is still invited to jump on board. My GIS implementation project is well on the way, and it seems there'll even be some money involved :-). Zoran ~joe On Tue, Oct 19, 2010 at 9:55 AM, Andreas Neumann a.neumann at carto.netwrote: Hi Zoran, I believe the infrastructure of what you want is already wihtin the selection and identify tools in QGIS. Isn't this almost implemented in the current identify tool? It sort of is, but not completely. Identify will ID all the features within certain radios (percentage of extent), but it will ID _all_ of the features within this radius. I only need the nearest, no matter how far away... Let us say it is, for simplicity, within current extent. The current identify tool selects near or close by features within a certain tolerance. This tolerance can be set in Options -- Map tools search radius. I believe it currently only effects the identify tool. Do you want the same tolerance also be used for the click-selection tool? Look above. This could be useful, but it is not the functionality I'm currently looking after. Are you also aware that in QGIS 1.6 there are new selection tools? * by click * by rectangle * by polygon * by freehand * by radius Yup, these are great, but they all select _multiple_ features within radius, rectangle, etc. Maybe this also helps to address your needs? Of course you can combine it with previous selections by pressing the ctrl key. BR, --- Zoran Jankovic ZIS-Izrada softvera i savjetovanje / ZIS - Software Development and Consulting http://www.zisis.hr M: 00 385 98 682 902 T: 00 385 44 683 374 A. Senoe 4 44320 Kutina Croatia ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
