Re: [Qgis-user] how to interpolate points to a grid
I don't think Raster Grid Interpolation and Polygonize are the correct tools for what you pretend. Did you try the Interpolation Plugin? Make it active in the plugin manager, then check this tutorial: http://www.gistutor.com/quantum-gis/20-intermediate-quantum-gis-tutorials/51-inverse-distance-weighting-idw-interpolation-using-qgis.html Best Luck, Alex On Fri, Aug 5, 2011 at 2:52 PM, M.E.Dodd wrote: > I have various layers of points from various shapes of sampling (not a > regular rectangular grid) and want to interpolate each of them to produce a > set of raster images. In previous GIS I have used this was generally a > matter of making a boundary then telling the gis the points layer and extent > as shown by the boundary and then trying various interpolation methods to > see which one looked most like the real data. However I have yet to find > suitable tools in Qgis to do this. The raster grid interpolate and > polygonise don’t seem to have suitable options and when I did try them the > output looked rather strange and not what I was expecting as it seemed to > have missed out much of the data. > > > -- > The Open University is incorporated by Royal Charter (RC 000391), an exempt > charity in England & Wales and a charity registered in Scotland (SC 038302). > > ___ > 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: [Qgis-user] how to interpolate points to a grid
On Fri, 2011-08-05 at 14:52 +0100, M.E.Dodd wrote: > I have various layers of points from various shapes of sampling (not a > regular rectangular grid) and want to interpolate each of them to > produce a set of raster images. In previous GIS I have used this was > generally a matter of making a boundary then telling the gis the > points layer and extent as shown by the boundary and then trying > various interpolation methods to see which one looked most like the > real data. However I have yet to find suitable tools in Qgis to do > this. The raster grid interpolate and polygonise don’t seem to have > suitable options and when I did try them the output looked rather > strange and not what I was expecting as it seemed to have missed out > much of the data. > > > Did you have a look at the GRASS plugin with it's various v.surf.* modules? That's what I usually use to interpolate i.e. an DEM grid from point elevations. The v.surf.rst module does best when the surface should be smoothed, and not necessarily go exactly thru each point. > -- > The Open University is incorporated by Royal Charter (RC 000391), an > exempt charity in England & Wales and a charity registered in Scotland > (SC 038302). > > This mail was received via Mail-SeCure System. > > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user > > This mail was received via Mail-SeCure System. > > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] how to interpolate points to a grid
I have various layers of points from various shapes of sampling (not a regular rectangular grid) and want to interpolate each of them to produce a set of raster images. In previous GIS I have used this was generally a matter of making a boundary then telling the gis the points layer and extent as shown by the boundary and then trying various interpolation methods to see which one looked most like the real data. However I have yet to find suitable tools in Qgis to do this. The raster grid interpolate and polygonise don't seem to have suitable options and when I did try them the output looked rather strange and not what I was expecting as it seemed to have missed out much of the data. -- The Open University is incorporated by Royal Charter (RC 000391), an exempt charity in England & Wales and a charity registered in Scotland (SC 038302). ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Is there a way to get the legend graphic from a wms into map composer?
As the title says, I'm looking for ways to include the legend of a requested wms into map composer. -- cheers, maning -- "Freedom is still the most radical idea of all" -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] how to save style
I have created a style using new symbology and a colour ramp that I have selected from one of the big list (it goes from whitish to red). Then modified the range and label just by typing in the relevant figures. But then it won't save, it says it has saved but when I look in the directory there is nothing there, have checked the file path and definitely no .qml file in that directory. I have saved .qml files in other instances for raster layers but this is a bit different. The layer is from a .csv points file and I want to classify the values in one of the columns and display this as the varying red colour. It works using the default methods and shows the dots as different colours but not when I set up my own. One reason for wanting to set my own is that I want to produce an animation showing how the values over several years so want to use the same scale each year and rather than manually changing the range and label for each year's dataset I want to make a style so can apply it to each automatically. -- The Open University is incorporated by Royal Charter (RC 000391), an exempt charity in England & Wales and a charity registered in Scotland (SC 038302). ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] qgis 1.7 on Microsoft server 2003 not launching - SOLVED
Hi list, the problem exposed yesterday was finally solved (error 0xc06d007e on launching). It was a very uncommon registry conflict generated by a Citrix software. We found a patch and a tutorial here: http://www.personalcomputerfixes.com/general-errors/0xc06d007e-error-repair-tutorial-how-to-fix-the-0xc06d007e-error/ http://support.attachmate.com/techdocs/2358.html Hope this can be useful to someone else Regis___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
