Re: [Qgis-user] Vector/Raster Projection Problem
Hi Terry, You shouldn't be having such a difficult time getting them to align. I've done similiar with SRTM/GDEM etc. Have you projected the shapefile to wgs84 to review alignment? Can you please put together a small subset clip of raster data for area & the shapefile you are using. Drop me a the link from Dropbox or other service & I will take a look over. Cheers, Richard -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Vector-Raster-Projection-Problem-tp4994512p4994540.html Sent from the Quantum GIS - User mailing list archive at Nabble.com. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Vector/Raster Projection Problem
I'm not sure what I've done differently, but I managed tonight to get the projections to overlap. The counties vector layer appears to have been reprojected to WGS84, and the display projection is NAD 83 (EPSG: 2992). I tried to duplicate this in a second instantiation of QGIS, so far unsuccessfully. I'm going to have to experiment more. In the interim, When I try to clip the raster file in the successful superimposition to the extent of the counties layer using the raster clipper and get the error message: Computed -srcwin falls outside raster size of 28800x19200. Any idea what that is about? Thanks, Terry >From: richard burcher >Sent: Aug 10, 2012 3:49 PM >To: qgis-user@lists.osgeo.org >Subject: Re: [Qgis-user] Vector/Raster Projection Problem > >Hi Terry, > >You shouldn't be having such a difficult time getting them to align. I've >done similiar with SRTM/GDEM etc. > >Have you projected the shapefile to wgs84 to review alignment? > >Can you please put together a small subset clip of raster data for area & >the shapefile you are using. Drop me a the link from Dropbox or other >service & I will take a look over. > >Cheers, > >Richard ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Vector/Raster Projection Problem
On 11/08/2012 12:09, Terry Morse wrote: I'm not sure what I've done differently, but I managed tonight to get the projections to overlap. The counties vector layer appears to have been reprojected to WGS84, and the display projection is NAD 83 (EPSG: 2992). I tried to duplicate this in a second instantiation of QGIS, so far unsuccessfully. I'm going to have to experiment more. In the interim, When I try to clip the raster file in the successful superimposition to the extent of the counties layer using the raster clipper and get the error message: Computed -srcwin falls outside raster size of 28800x19200. Any idea what that is about? I tried to duplicate your steps. Seems to work fine (QGIS 1.8 on WinXP OSGeo4W installer) I downloaded the counties shapefile and loaded it into QGIS. The CRS was listed as USER:10 (probably since the Oregon LCC projection it's not in the proj4 database.) So I left the CRS as is, and set "On-the-Fly" reprojection. Next I got one tile from GMTED (30 arcsec) and it seems to overlay the counties correctly. (I'm judging from the coastline and Columbia river, since I don't know where the actual county boundaries are in the DEM...) Next I ran the clipper tool from the Raster menu, and again it worked as expected. The clipped DEM remained in EPSG:4326, like the original GMTED. I can send the clipped raster if it will be any help. Since both layers you mentioned have full CRS metadata, I think if you don't mess with the CRS of the layers, just enable OTF, it will be fine. -- Micha Thanks, Terry From: richard burcher Sent: Aug 10, 2012 3:49 PM To: qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] Vector/Raster Projection Problem Hi Terry, You shouldn't be having such a difficult time getting them to align. I've done similiar with SRTM/GDEM etc. Have you projected the shapefile to wgs84 to review alignment? Can you please put together a small subset clip of raster data for area & the shapefile you are using. Drop me a the link from Dropbox or other service & I will take a look over. Cheers, Richard ___ 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
Re: [Qgis-user] Vector/Raster Projection Problem
Thank you Micha and Richard.I'm not sure what to make of the complex pattern which is emerging:If I open a new project and enable on the fly projection without designating a project, then add both the vector and raster layers, they do not superimpose.If I open a new project, enable on the fly projection, and set the project projection to "NAD 83: Oregon Lambert (feet)," the layers do not superimpose.If I set the raster layer projection to Oregon Lambert from WGS 84, the files do not superimpose.If I set the vector layer projection to Oregon Lambert while leaving the raster in WGS 84, they do superimpose.I can clip the raster layer to the geographic extent of Oregon by entering the lat/long boundaries of the state gleaned from Wikipedia into the Clipper dialogue, but if I try to clip the raster by drawing a bounding box around the counties vector, I get the "Computed -srcwin falls outside raster size . . ." error, even though the layers seemingly superimpose. It's as if I have forced them to coincide on-screen by manipulating their projections, even though they don't actually coincide.I don't get it.Terry On 11/08/2012 12:09, Terry Morse wrote I'm not sure what I've done differently, but I managed tonight to get the projections to overlap. The counties vector layer appears to have been reprojected to WGS84, and the display projection is NAD 83 (EPSG: 2992). I tried to duplicate this in a second instantiation of QGIS, so far unsuccessfully. I'm going to have to experiment more. In the interim, When I try to clip the raster file in the successful superimposition to the extent of the counties layer using the raster clipper and get the error message: Computed -srcwin falls outside raster size of 28800x19200. Any idea what that is about? I tried to duplicate your steps. Seems to work fine (QGIS 1.8 on WinXP OSGeo4W installer) I downloaded the counties shapefile and loaded it into QGIS. The CRS was listed as USER:10 (probably since the Oregon LCC projection it's not in the proj4 database.) So I left the CRS as is, and set "On-the-Fly" reprojection. Next I got one tile from GMTED (30 arcsec) and it seems to overlay the counties correctly. (I'm judging from the coastline and Columbia river, since I don't know where the actual county boundaries are in the DEM...) Next I ran the clipper tool from the Raster menu, and again it worked as expected. The clipped DEM remained in EPSG:4326, like the original GMTED. I can send the clipped raster if it will be any help. Since both layers you mentioned have full CRS metadata, I think if you don't mess with the CRS of the layers, just enable OTF, it will be fine. -- Micha Thanks, Terry From: richard burcher Sent: Aug 10, 2012 3:49 PM To: qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] Vector/Raster Projection Problem Hi Terry, You shouldn't be having such a difficult time getting them to align. I've done similiar with SRTM/GDEM etc. Have you projected the shapefile to wgs84 to review alignment? Can you please put together a small subset clip of raster data for area & the shapefile you are using. Drop me a the link from Dropbox or other service & I will take a look over. Cheers, Richard ___ 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
Re: [Qgis-user] Vector/Raster Projection Problem
Am 14.08.12 10:21, schrieb Terry Morse: I'm not sure what to make of the complex pattern which is emerging: ... I don't get it. Ok, then try a third, independent view: Install the Openlayers plugin, open a new project in EPSG:3857 and on-the-fly-projection, and load your vector and raster data, and a OSM or Google background from OL plugin. The layer that does not coincide with Openstreetmap or Google background, has a wrong CRS. HTH, André Joost ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Vector/Raster Projection Problem
Thank you for the suggestion, Andre. I tried to install Openlayers using the plug-in installer, but it appears not to be in the official plug-in repository. The closest I came was OGR2Layers, which exports OGR layers to OpenLayers html. I also tried googling it, but didn't locate a download source. Any suggestions on how I can find and install it? Thanks, Terry On 14 Aug 2012 at 12:37, Andre Joost wrote: > Ok, then try a third, independent view: > > Install the Openlayers plugin, open a new project in EPSG:3857 and > on-the-fly-projection, and load your vector and raster data, and a OSM > or Google background from OL plugin. > > The layer that does not coincide with Openstreetmap or Google > background, has a wrong CRS. > > HTH, > André Joost > > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user > Terry Morse 935 SW 10th St. #6 Newport, OR 97365 Phone: 541-265-8434 e-mail: tmo...@teleport.com http://home.teleport.com/~tmorse/index.html ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Vector/Raster Projection Problem
Am 16.08.12 08:13, schrieb Terry Morse: Thank you for the suggestion, Andre. I tried to install Openlayers using the plug-in installer, but it appears not to be in the official plug-in repository. Yes, it is only in the authors repository: http://build.sourcepole.ch/qgis/plugins.xml You can add this to the list of your repositories Python-plugin Installation, second tab, Add... Or take the zip directly from the page and expand it to your C:\Documents&Settings//.qgis/python/plugins folder. If you haven't done that before, I would suggest the first method. Greetings, André Joost ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Vector/Raster Projection Problem
As Andre suggested, I installed OpenLayers and opened my problem layers: counties (vector) and a mosaicked GMTED (raster); over a Google hybrid map, with th projection set to EPSG 3857. The GMTED layer superimposed properly over the Google image and the counties layer did not. Saving the counties layer with the pseudomercator projection led to it overlaying properly as well. Thank you Andre, and everyone else who who assisted. Terry On 16 Aug 2012 at 11:09, Andre Joost wrote: > Am 16.08.12 08:13, schrieb Terry Morse: > > Thank you for the suggestion, Andre. > > > > I tried to install Openlayers using the plug-in installer, but it appears > > not to be in the official > > plug-in repository. > > Yes, it is only in the authors repository: > > http://build.sourcepole.ch/qgis/plugins.xml > > You can add this to the list of your repositories > Python-plugin Installation, second tab, Add... > > Or take the zip directly from the page and expand it to your > C:\Documents&Settings//.qgis/python/plugins folder. > If you haven't done that before, I would suggest the first method. > > Greetings, > André Joost > > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user > Terry Morse 935 SW 10th St. #6 Newport, OR 97365 Phone: 541-265-8434 e-mail: tmo...@teleport.com http://home.teleport.com/~tmorse/index.html ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
