Re: [Qgis-user] Error in Georeferencer
See http://hub.qgis.org/issues/8961 Agus On Fri, Oct 25, 2013 at 4:08 PM, Jukka Rahkonen wrote: > Agustin Lobo writes: > >> >> I'm finding wrong, distorted results with qgis 2.0 georeferencer. We've tried >> with the same set of gcp's in envi and the same polynomial (deg 2) and >> there the results are correct, but with >> qgis the result is very distorted. Actually, the errors represented by >> the red segments in the >> georeferencer do not correspond with the actual gcps displayed on the > reference >> image in Qgis main display. >> See an snapshot here: >> https://dl.dropboxusercontent.com/u/3180464/georef_error.jpeg >> >> It looks like if the polynomial were not correctly fit? >> >> I've run the gdal commands on the terminal and the result is the same, >> so this could be a gdal problem. >> Has anybody found the same problem? Just checking before reporting. > > Please send the exact GDAL command that gets created and even better if you > can put somewhere an original small sample image and expected result that > you get from envi so someone can repeat. And for comparison everything that > is needed to repeat what you did with envi too if someone happens to have > that software available. > > -Jukka Rahkonen- > > ___ > 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] Error in Georeferencer
Agustin Lobo writes: > > I'm finding wrong, distorted results with qgis 2.0 georeferencer. We've tried > with the same set of gcp's in envi and the same polynomial (deg 2) and > there the results are correct, but with > qgis the result is very distorted. Actually, the errors represented by > the red segments in the > georeferencer do not correspond with the actual gcps displayed on the reference > image in Qgis main display. > See an snapshot here: > https://dl.dropboxusercontent.com/u/3180464/georef_error.jpeg > > It looks like if the polynomial were not correctly fit? > > I've run the gdal commands on the terminal and the result is the same, > so this could be a gdal problem. > Has anybody found the same problem? Just checking before reporting. Please send the exact GDAL command that gets created and even better if you can put somewhere an original small sample image and expected result that you get from envi so someone can repeat. And for comparison everything that is needed to repeat what you did with envi too if someone happens to have that software available. -Jukka Rahkonen- ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Error in Georeferencer
I'm finding wrong, distorted results with qgis 2.0 georeferencer. We've tried with the same set of gcp's in envi and the same polynomial (deg 2) and there the results are correct, but with qgis the result is very distorted. Actually, the errors represented by the red segments in the georeferencer do not correspond with the actual gcps displayed on the reference image in Qgis main display. See an snapshot here: https://dl.dropboxusercontent.com/u/3180464/georef_error.jpeg It looks like if the polynomial were not correctly fit? I've run the gdal commands on the terminal and the result is the same, so this could be a gdal problem. Has anybody found the same problem? Just checking before reporting. Agus ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Error in Georeferencer tool
I've uploaded the input layer and points file to: https://sites.google.com/site/filestemp2/home/Ilerfly125v2.tif?attredirects=0&d=1 https://sites.google.com/site/filestemp2/home/Ilerfly125v2.tif.points?attredirects=0&d=1 in case someone could test prior reporting this as a bug. Agus 2011/11/28 Agustin Lobo : > Unfortunately this is not the case with ED50 UTM31N: the resulting layer has > the > correct CRS, but it is shifted. The points appear where they have to > be, but the raster layer > is shifted. > We'll try with points set on google mercator. > Thanks > > 2011/11/28 : >> Hi, Agus; >> >> You set your desired CRS in the Georeferencing properties. What I am >> saying is that this setting seems to be ignored and, in place of the >> specified CRS, some strange unknown custom CRS is substituted. By going >> to the layer properties for the georeferenced layer (after it has been >> added to your project) and resetting the CRS to the correct one, the >> georeferenced layer then displays properly. This is my experience >> anyhow - particularly using Google or OSM (both have Google Mercator CRS) >> maps as reference. >> >> Best regards, >> Dennis >> >>> I was suspecting something like this too. But the question is that the CRS >>> of the input image should be, by definition, unknown. In case the input >>> image has a CRS, this CRS should be just ignored. Instead, the plugin >>> actually prompts the user about the CRS of the input image. And I do not >>> find any way to set the input CRS to unknown or just arbitrary x,y >>> coordinates (while this is possible in Grass). >>> >>> Where you say: >>> >>> "Upon resetting the CRS specified in the layer properties to the correct >>> one, all was well" >>> do you refer to the input or to the output image? >>> >>> Agus >>> >>> 2011/11/27 Dennis M. Linton >>> ** I have observed this behaviour in QGIS 1.7.2 and found, upon reviewing the layer properties of the georectified layer, that the coordinate reference system being used was NOT the one specified in the Georeferencing plugin. Rather, the CRS was some unknown custom CRS. Upon resetting the CRS specified in the layer properties to the correct one, all was well. Hope this helps. Best regards, Dennis -- Dennis M. Linton, P.Eng. Tel: +1 (613) 473-1015 Cell: +1 (705) 312-1336 Skype: thedmlinton On Sun, 2011-11-27 at 22:10 +0100, Agustin Lobo wrote: Hi! We are using the Georeferencer tool and the resulting image is shifted, please see the screenshot here:https://sites.google.com/site/filestemp2/home/error_georef.jpg?attredirects=0 We've tried polynomia of order 1 and 2 and Helmert, with very similar results. I think this is a bug, but I'm not sure we are not actually doing something wrong. Agus ___ Qgis-user mailing listQgis-user@lists.osgeo.orghttp://lists.osgeo.org/mailman/listinfo/qgis-user ___ 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 >> > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Error in Georeferencer tool
Unfortunately this is not the case with ED50 UTM31N: the resulting layer has the correct CRS, but it is shifted. The points appear where they have to be, but the raster layer is shifted. We'll try with points set on google mercator. Thanks 2011/11/28 : > Hi, Agus; > > You set your desired CRS in the Georeferencing properties. What I am > saying is that this setting seems to be ignored and, in place of the > specified CRS, some strange unknown custom CRS is substituted. By going > to the layer properties for the georeferenced layer (after it has been > added to your project) and resetting the CRS to the correct one, the > georeferenced layer then displays properly. This is my experience > anyhow - particularly using Google or OSM (both have Google Mercator CRS) > maps as reference. > > Best regards, > Dennis > >> I was suspecting something like this too. But the question is that the CRS >> of the input image should be, by definition, unknown. In case the input >> image has a CRS, this CRS should be just ignored. Instead, the plugin >> actually prompts the user about the CRS of the input image. And I do not >> find any way to set the input CRS to unknown or just arbitrary x,y >> coordinates (while this is possible in Grass). >> >> Where you say: >> >> "Upon resetting the CRS specified in the layer properties to the correct >> one, all was well" >> do you refer to the input or to the output image? >> >> Agus >> >> 2011/11/27 Dennis M. Linton >> >>> ** >>> I have observed this behaviour in QGIS 1.7.2 and found, upon reviewing >>> the >>> layer properties of the georectified layer, that the coordinate >>> reference >>> system being used was NOT the one specified in the Georeferencing >>> plugin. >>> Rather, the CRS was some unknown custom CRS. Upon resetting the CRS >>> specified in the layer properties to the correct one, all was well. >>> >>> Hope this helps. >>> >>> Best regards, >>> Dennis >>> >>> -- >>> Dennis M. Linton, P.Eng. >>> Tel: +1 (613) 473-1015 >>> Cell: +1 (705) 312-1336 >>> Skype: thedmlinton >>> >>> >>> >>> >>> On Sun, 2011-11-27 at 22:10 +0100, Agustin Lobo wrote: >>> >>> >>> Hi! >>> We are using the Georeferencer tool and the resulting image is shifted, >>> please see the screenshot >>> here:https://sites.google.com/site/filestemp2/home/error_georef.jpg?attredirects=0 >>> >>> >>> We've tried polynomia of order 1 and 2 and Helmert, with very similar >>> results. >>> >>> I think this is a bug, but I'm not sure we are not actually doing >>> something wrong. >>> >>> Agus >>> ___ >>> Qgis-user mailing >>> listQgis-user@lists.osgeo.orghttp://lists.osgeo.org/mailman/listinfo/qgis-user >>> >>> >>> ___ >>> 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 > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Error in Georeferencer tool
Hi, Agus; You set your desired CRS in the Georeferencing properties. What I am saying is that this setting seems to be ignored and, in place of the specified CRS, some strange unknown custom CRS is substituted. By going to the layer properties for the georeferenced layer (after it has been added to your project) and resetting the CRS to the correct one, the georeferenced layer then displays properly. This is my experience anyhow - particularly using Google or OSM (both have Google Mercator CRS) maps as reference. Best regards, Dennis > I was suspecting something like this too. But the question is that the CRS > of the input image should be, by definition, unknown. In case the input > image has a CRS, this CRS should be just ignored. Instead, the plugin > actually prompts the user about the CRS of the input image. And I do not > find any way to set the input CRS to unknown or just arbitrary x,y > coordinates (while this is possible in Grass). > > Where you say: > > "Upon resetting the CRS specified in the layer properties to the correct > one, all was well" > do you refer to the input or to the output image? > > Agus > > 2011/11/27 Dennis M. Linton > >> ** >> I have observed this behaviour in QGIS 1.7.2 and found, upon reviewing >> the >> layer properties of the georectified layer, that the coordinate >> reference >> system being used was NOT the one specified in the Georeferencing >> plugin. >> Rather, the CRS was some unknown custom CRS. Upon resetting the CRS >> specified in the layer properties to the correct one, all was well. >> >> Hope this helps. >> >> Best regards, >> Dennis >> >> -- >> Dennis M. Linton, P.Eng. >> Tel: +1 (613) 473-1015 >> Cell: +1 (705) 312-1336 >> Skype: thedmlinton >> >> >> >> >> On Sun, 2011-11-27 at 22:10 +0100, Agustin Lobo wrote: >> >> >> Hi! >> We are using the Georeferencer tool and the resulting image is shifted, >> please see the screenshot >> here:https://sites.google.com/site/filestemp2/home/error_georef.jpg?attredirects=0 >> >> >> We've tried polynomia of order 1 and 2 and Helmert, with very similar >> results. >> >> I think this is a bug, but I'm not sure we are not actually doing >> something wrong. >> >> Agus >> ___ >> Qgis-user mailing >> listQgis-user@lists.osgeo.orghttp://lists.osgeo.org/mailman/listinfo/qgis-user >> >> >> ___ >> 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] Error in Georeferencer tool
I was suspecting something like this too. But the question is that the CRS of the input image should be, by definition, unknown. In case the input image has a CRS, this CRS should be just ignored. Instead, the plugin actually prompts the user about the CRS of the input image. And I do not find any way to set the input CRS to unknown or just arbitrary x,y coordinates (while this is possible in Grass). Where you say: "Upon resetting the CRS specified in the layer properties to the correct one, all was well" do you refer to the input or to the output image? Agus 2011/11/27 Dennis M. Linton > ** > I have observed this behaviour in QGIS 1.7.2 and found, upon reviewing the > layer properties of the georectified layer, that the coordinate reference > system being used was NOT the one specified in the Georeferencing plugin. > Rather, the CRS was some unknown custom CRS. Upon resetting the CRS > specified in the layer properties to the correct one, all was well. > > Hope this helps. > > Best regards, > Dennis > > -- > Dennis M. Linton, P.Eng. > Tel: +1 (613) 473-1015 > Cell: +1 (705) 312-1336 > Skype: thedmlinton > > > > > On Sun, 2011-11-27 at 22:10 +0100, Agustin Lobo wrote: > > > Hi! > We are using the Georeferencer tool and the resulting image is shifted, > please see the screenshot > here:https://sites.google.com/site/filestemp2/home/error_georef.jpg?attredirects=0 > > > We've tried polynomia of order 1 and 2 and Helmert, with very similar results. > > I think this is a bug, but I'm not sure we are not actually doing > something wrong. > > Agus > ___ > Qgis-user mailing > listQgis-user@lists.osgeo.orghttp://lists.osgeo.org/mailman/listinfo/qgis-user > > > ___ > 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] Error in Georeferencer tool
I have observed this behaviour in QGIS 1.7.2 and found, upon reviewing the layer properties of the georectified layer, that the coordinate reference system being used was NOT the one specified in the Georeferencing plugin. Rather, the CRS was some unknown custom CRS. Upon resetting the CRS specified in the layer properties to the correct one, all was well. Hope this helps. Best regards, Dennis -- Dennis M. Linton, P.Eng. Tel: +1 (613) 473-1015 Cell: +1 (705) 312-1336 Skype: thedmlinton On Sun, 2011-11-27 at 22:10 +0100, Agustin Lobo wrote: > Hi! > We are using the Georeferencer tool and the resulting image is shifted, > please see the screenshot here: > https://sites.google.com/site/filestemp2/home/error_georef.jpg?attredirects=0 > > We've tried polynomia of order 1 and 2 and Helmert, with very similar results. > > I think this is a bug, but I'm not sure we are not actually doing > something wrong. > > Agus > ___ > 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
[Qgis-user] Error in Georeferencer tool
Hi! We are using the Georeferencer tool and the resulting image is shifted, please see the screenshot here: https://sites.google.com/site/filestemp2/home/error_georef.jpg?attredirects=0 We've tried polynomia of order 1 and 2 and Helmert, with very similar results. I think this is a bug, but I'm not sure we are not actually doing something wrong. Agus ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
