Re: [Qgis-user] Interpolation plugin error message
Maybe this can help http://gis.stackexchange.com/questions/199393/grass-tools-not-working-in-qgis-2-14-3-essen-osgeo4w Make sure the path to grass is good. steve De :antonio scotti A : Cc :"qgis-user@lists.osgeo.org" Date : 2017-03-08 10:07 Objet : Re: [Qgis-user] Interpolation plugin error message Envoyé par :"Qgis-user" Hi, thanks for your reply. I found a couple of GRASS utilities that do interpolation in the processes toolbox. I tried to run one of these but receive a message saying that GRASS in not correcly installed === PermaCultura-es http://www.permacultura-es.org Il Mercoledì 8 Marzo 2017 11:36, Bernd Vogelgesang ha scritto: Hi, from my experiences longer ago, the interpolation plugin is not really easy to use and seems not to be maintained/enhanced for a long time. Maybe you can find a substitute for your interpolation tasks in the Processing toolbox? Cheers Bernd Am 08.03.2017, 00:23 Uhr, schrieb antonio scotti : Hi all, I am new to this forum and to QGIS I am trying to construct a DEM from contour lines by using QGIS 2.14.0. I am doing this by using a clip rectangle on top of the contour lines and interpolating, by using the interpolation plugin After I enter the data in the interpolation dialog and clic Save I get an exception (se attached file). Any help appreciated Best regards === PermaCultura-es http://www.permacultura-es.org -- Bernd Vogelgesang Siedlerstraße 2 91083 Baiersdorf/Igelsdorf Tel: 09133-825374 ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Interpolation plugin error message
2017-03-08 0:23 GMT+01:00 antonio scotti : > Hi all, I am new to this forum and to QGIS > I am trying to construct a DEM from contour lines by using QGIS 2.14.0. > I am doing this by using a clip rectangle on top of the contour lines and > interpolating, by using the interpolation plugin > > After I enter the data in the interpolation dialog and clic Save I get an > exception (se attached file). > Any help appreciated Hi, I have the same problem if i cut vector layers previously with geoprocessing clip. If you want use the interpolation plugin, try not to cut the vector layers, but after, cut the dem (raster --> Exstraction --> Clipper). Lorenzo ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Interpolation plugin error message
Hi, from my experiences longer ago, the interpolation plugin is not really easy to use and seems not to be maintained/enhanced for a long time. Maybe you can find a substitute for your interpolation tasks in the Processing toolbox? Cheers Bernd Am 08.03.2017, 00:23 Uhr, schrieb antonio scotti : Hi all, I am new to this forum and to QGIS I am trying to construct a DEM from contour lines by using QGIS 2.14.0. I am doing this by using a clip rectangle on top of the contour lines and interpolating, by using the interpolation plugin After I enter the data in the interpolation dialog and clic Save I get an exception (se attached file). Any help appreciated Best regards ===PermaCultura-es http://www.permacultura-es.org -- Bernd Vogelgesang Siedlerstraße 2 91083 Baiersdorf/Igelsdorf Tel: 09133-825374___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Interpolation Plugin
Thanks a lot Marco! It's all much more clear to me now - specially after consulting your dissertation - it has a lot of valuable information for me. Very helpful share - thanks! Paolo: I've followed your sugestion and opened a tickect suggesting a better documentation for the interpolation plugin --> https://trac.osgeo.org/qgis/ticket/3103 Best regards 2010/10/10 Marco Hugentobler > Hi André > > > Now my question is: what does it mean the options "structured lines" and > > "break lines"? > > These options have no influence for IDW interpolation, only for TIN > interpolation. > > -structure lines: triangle edges are constrained to line / polygon features > (e.g. to prevent triangle edges crossing valleys, ridges or contours) > > -breaklines: like structure lines. But for cubic triangle interpolation ( > clough-tocher), the break line is a edge (so not continuously > differentiable) > (details in > > http://www.geo.uzh.ch/fileadmin/files/content/abteilungen/gis/research/phd_theses/thesis_MarcoHugentobler_2004.pdf > , > chapter 5) > > >And by the way, > > what does the "Distance coefficient" implies? > > It's the same parameter as the 'power' (IDW only has one parameter). > > > Regards, > Marco > > Am Samstag, 9. Oktober 2010, um 19.48:23 schrieb ALT SHN: > > Hello List, > > > > I have a question about the QGIS Interpolartion Plugin. > > > > I have a line vector representing altitude by means of isolines of 10m, > > covering an area of about 400 square km. I have read scientif paper that > > advices the use of IDW with power 1-3 for hilly topography (thats my > case). > > > > Now my question is: what does it mean the options "structured lines" and > > "break lines"? How can they affect the accuracy of my DEM? And by the > way, > > what does the "Distance coefficient" implies? > > > > Thanks in advance > > > > André > > > -- > Dr. Marco Hugentobler > Sourcepole - Linux & Open Source Solutions > Webereistr. 66, CH-8134 Adliswil, Switzerland > marco.hugentob...@sourcepole.ch http://www.sourcepole.ch > Technical Advisor QGIS Project Steering Committee > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user > -- --- Associação Leonel Trindade SOCIEDADE DE HISTÓRIA NATURAL Apartado 25 2564-909 Torres Vedras Portugal Sede e Biblioteca: rua Cavaleiros da Espora Dourada, 27A 2560 Torres Vedras Laboratório de Paleontologia e Paleoecologia: Polígono Industrial do Alto do Ameal 2565-641 Ramalhal http://alt-shn.blogspot.com www.alt-shn.org ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Interpolation Plugin
Hi André > Now my question is: what does it mean the options "structured lines" and > "break lines"? These options have no influence for IDW interpolation, only for TIN interpolation. -structure lines: triangle edges are constrained to line / polygon features (e.g. to prevent triangle edges crossing valleys, ridges or contours) -breaklines: like structure lines. But for cubic triangle interpolation ( clough-tocher), the break line is a edge (so not continuously differentiable) (details in http://www.geo.uzh.ch/fileadmin/files/content/abteilungen/gis/research/phd_theses/thesis_MarcoHugentobler_2004.pdf, chapter 5) >And by the way, > what does the "Distance coefficient" implies? It's the same parameter as the 'power' (IDW only has one parameter). Regards, Marco Am Samstag, 9. Oktober 2010, um 19.48:23 schrieb ALT SHN: > Hello List, > > I have a question about the QGIS Interpolartion Plugin. > > I have a line vector representing altitude by means of isolines of 10m, > covering an area of about 400 square km. I have read scientif paper that > advices the use of IDW with power 1-3 for hilly topography (thats my case). > > Now my question is: what does it mean the options "structured lines" and > "break lines"? How can they affect the accuracy of my DEM? And by the way, > what does the "Distance coefficient" implies? > > Thanks in advance > > André -- Dr. Marco Hugentobler Sourcepole - Linux & Open Source Solutions Webereistr. 66, CH-8134 Adliswil, Switzerland marco.hugentob...@sourcepole.ch http://www.sourcepole.ch Technical Advisor QGIS Project Steering Committee ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Interpolation Plugin
Il 09/10/2010 19:48, ALT SHN ha scritto: > Hello List, > > I have a question about the QGIS Interpolartion Plugin. Similar issue here: https://trac.osgeo.org/qgis/ticket/2668 Could you please add a ticket with your questions? Thanks. -- Paolo Cavallini: http://www.faunalia.it/pc ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Interpolation Plugin
Hello List, I have a question about the QGIS Interpolartion Plugin. I have a line vector representing altitude by means of isolines of 10m, covering an area of about 400 square km. I have read scientif paper that advices the use of IDW with power 1-3 for hilly topography (thats my case). Now my question is: what does it mean the options "structured lines" and "break lines"? How can they affect the accuracy of my DEM? And by the way, what does the "Distance coefficient" implies? Thanks in advance André -- --- Associação Leonel Trindade SOCIEDADE DE HISTÓRIA NATURAL Apartado 25 2564-909 Torres Vedras Portugal Sede e Biblioteca: rua Cavaleiros da Espora Dourada, 27A 2560 Torres Vedras Laboratório de Paleontologia e Paleoecologia: Polígono Industrial do Alto do Ameal 2565-641 Ramalhal http://alt-shn.blogspot.com www.alt-shn.org ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Interpolation plugin
Hi! I was using Arc/Info under Windows XP and now I migrated to Linux Gentoo and want to migrate to QGIS. One of the tasks I used Arc/Info for is *height (elevation) matrix creation*. I have polyline and point layers as sources. The former layer is more accurate. In Arc/Info I did it in two steps: 1) TIN creation from polyline layer. I also use a territory polygonal layer to limit interpolation borders (so called '*soft clip*'). 2) Convert TIN to Raster (in Arc/Info Binary Grid, *.adf) with 100*100 meters cell size. As a result I had 547 Mb raster layer *.adf file and some smaller informative *.adf files. I read QGIS 1.3.0 user guide and Marco's "Terrain Modelling with Triangle Based Free-Form Surfaces" thesis and as I understand there is only possibility to use point layers to create TIN in QGIS?! So, I tried this functionality in QGIS 1.4.0 under Gentoo Linux. I projected my point layer from Geographical Coordinate System to Projected CS (WGS84). Then set it as the source in Interpolation Plugin window and chose 100*100 (as I understand in meters) cell size of output layer. I don't know which format QGIS saves TIN in and there is no filters of file extensions in "Save interpolated layer as..." window. So, I simply chose "tin.adf". As a result of interpolation I have 2,5 Gb file, that seems to be less accurately than my 547 Mb Arc/Info Binary grid one. Some questions: 1) Is there a possibility in QGIS to use *polyline *layer as a source of interpolation (TIN creation)? If no, is it possible to add this functionality in the future? 2) Is there a possibility in QGIS to *limit* interpolation borders by another polygonal non-heights layer (such as Arc/Info 'soft clip')? 3) What is a dimension of cell coordinates? Are they use the same units as projected point layer units? 4) Which format QGIS saves TIN in? ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
