Re: [Qgis-user] Re: Projection of Shapefile export
Ken, That's a legendary effort if your getting sensible results with the icsm files. Do you think the format is suitable that it could be used in a sponsored bug fix? I gave this a shot myself but couldn't get it run at all, but then I have no idea what I'm doing so thats no real indication. I've had no success in getting parameters to stick (AGD66, AGD84 or GDA94) on shape or mapinfo files. Following solution was proposed by Roland Hill (22/09/2010 8:59pm) If your Custom CRS database does not appear to be working properly (ie you can see your custom CRS, but it isn't sticking to your data properly), then try to find your custom CRS database (qgis.db in your home directory on Linux, I guess it is in Application Settings or something similar in Windows) and delete it in case you have an old one with an incorrect format. Brett On 23/09/2010 12:47 PM, Ken Norris wrote: As Micha suggested, the National AGD66 distortion grid at http://www.icsm.gov.au/icsm/gda/gdatm/national66.zip and AGD84 distortion grid at http://www.icsm.gov.au/icsm/gda/gdatm/national84.zip seem to be the way forward. When unzipped, put into the proj directory (for me usr/share/proj) and coupled via the +nadgrids= parameter in a Custom CRS, it seems to yield the correct transform when tested. +proj=utm +zone=55 +south +ellps=aust_SA +nadgrids=AGD66.gsb +units=m +no_defs (I renamed the unzipped distortion file 'A66 National (13.09.01).gsb' file to 'AGD66.gsb' for convenience) But I can't make the parameters stick in the CRS of a vector file using the override facility. Any ideas? -- Brett Adams Spinifex Geophysics 0438 861 974 SKYPE:brettadams_spinifex ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: Projection of Shapefile export
As Micha suggested, the National AGD66 distortion grid at http://www.icsm.gov.au/icsm/gda/gdatm/national66.zip and AGD84 distortion grid at http://www.icsm.gov.au/icsm/gda/gdatm/national84.zip seem to be the way forward. When unzipped, put into the proj directory (for me usr/share/proj) and coupled via the +nadgrids= parameter in a Custom CRS, it seems to yield the correct transform when tested. +proj=utm +zone=55 +south +ellps=aust_SA +nadgrids=AGD66.gsb +units=m +no_defs (I renamed the unzipped distortion file 'A66 National (13.09.01).gsb' file to 'AGD66.gsb' for convenience) But I can't make the parameters stick in the CRS of a vector file using the override facility. Any ideas? -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/Projection-of-Shapefile-export-tp5536736p5561744.html Sent from the qgis-user mailing list archive at Nabble.com. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: Reproject WMS
>> * Why not use the vector in WGS84? >> my result map needs to be published projected >> * I first load the vector in arc and then the WMS tile. > > Then do all your work in WGS84 and just before publication, reproject > your result maps with the Raster -> Projection tool of QGIS (which is a > wrapper to the gdalwarp command). I think not the user should adapt to the software but vice-versa! Nearly all maps on the world prepared for interchange with authorities have some sort of projected SRS while most WMS deliver ggr. / WGS84. So you don't wanna always spend time for reprojecting but rather do the actual work. Anyway, thanks for the answer. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: Reproject WMS
> if you mean that arc* does raster reprojection I believe we all know > that is true as it is also true that at the moment QGIS doesn't > reproject on-the fly rasters. I believe also that this feature is on the > QGIS roadmap. Any idea who this support will be or where I could find more information? ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] standolone shapefile editor
Hi all,How can i make a standalone shapefile editor using qgis code. which part/file is responsible for editing shapefiles and viewing them.>Is it possible to make a shapfile editor from scratch. because i need an application to create/edit/view shapefiles ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Re: Reproject WMS
Le 22/09/2010 15:02, Timmie a écrit : Hello, thanks for all your answers. * Why not use the vector in WGS84? my result map needs to be published projected * I first load the vector in arc and then the WMS tile. Then do all your work in WGS84 and just before publication, reproject your result maps with the Raster -> Projection tool of QGIS (which is a wrapper to the gdalwarp command). ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Projection of Shapefile export
And if you change 20351 (AGD84 Z51) to 20251 (AGD66 Z51) in Micha's example conversion you get exactly the same result, which shouldn't happen. Again, I believe this is because none of the towgs84 parameters for AGD66 & AGD84 are included in Proj4 or QGIS. The GDA94 definition is probably OK. -- ROLAND HILL Director Four Winds Technology Pty Ltd Ph/Fax : +61 (0)2 6366 9425 Mobile : +61 (0)41 880 7472 roland.h...@fourwindstechnology.com.au Privacy and Confidentiality Notice The information contained herein and any attachments are intended solely for the named recipients. It may contain privileged confidential information. If you are not an intended recipient, please delete the message and any attachments then notify the sender of miss-delivery. Any use or disclosure of the contents of either is unauthorised and may be unlawful. All liability for viruses are excluded to the fullest extent permitted by law. On 22/09/10 22:50, Micha Silver wrote: On 09/22/2010 11:59 AM, Brett Adams wrote: Gents, Guess I'm wondering what the next step on this topic is. I don't know what to do next. Currently QGIS cannot separate ADG66/ AGD84 /GDA94 in either export or import. If it can, then I haven't seen it and if its that fickle, its way too dangerous for me. Not keen on going to another package as they take time to learn. Is it even an option to sponsor someone to sort this out for me? Technically I'm way over my depth so can't offer many solutions myself. I need some honest answers. Thanks Hi Brett: Ken Norris indicated [1] that there might be a general problem transforming from AGD66 or AGD84 (which use the aust_SA ellipsoid) to GDA94 which is based on the GRS80 ellipsoid. He mentioned Oziexplorer which does the transform correctly. To the best of my understanding, proj4 (and thus QGIS) doesn't do any transform between the two. Here's a trivial example. I took a coord pair from the file you posted and ran it thru the proj4 cs2cs utility with epsg:20351 as the source CRS (that's AGD84) and epsg:28351 as the target CRS (GDA94). echo "275635 6411747" | cs2cs +init=epsg:20351 +to +init=epsg:28351 275635.81 6411759.44 0.00 Note that the resulting X-Y is offset by only about 12 meters. But you're expecting a shift of nearly 200 m. So it seems proj4 is missing here. Normally datum transforms fit into either a 3 parameter or 7 parameter model. It might be that the transform between those datums requires something fancy, or localized that regular datum transforms cannot do. So proj4 just doesn't handle it. The best source for an authoritative answer would, of course, be the Australian govt' mapping agency. If you learn anything more, please let us know... Regards, Micha [1] http://osgeo-org.1803224.n2.nabble.com/Projection-of-Shapefile-export-tp5536736p5552105.html ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: Reproject WMS
> I am taking the maps from here: http://msrmaps.com/webservices.aspx > and need to reproject to > NAD83 / Texas Centric Albers Equal Area (EPSG:3083) ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: Reproject WMS
Hello, thanks for all your answers. * Why not use the vector in WGS84? my result map needs to be published projected * I first load the vector in arc and then the WMS tile. Tp be more clear: I am taking the maps from here: and need to reproject to NAD83 / Texas Centric Albers Equal Area (EPSG:3083) Best regards, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Projection of Shapefile export
Brett, Have a look at http://blog.gmane.org/gmane.comp.gis.gdal.devel/month=20060301 for another discussion on using AGD66 / AGD84. It basically describes how the Proj4 definitions (which is where the Qgis CRS database comes from) are not correct for AGD66 and AGD84. It also gives alternative definitions a bit further down the discussion. You will notice how all the AGD66 definitions have the same towgs84 parameters, as do the AGD84 definitions, but they are different for each datum. That's were the shift from AGD66 to AGD84 should come from. Note that my understanding is that the towgs84 parameters supplied are not definitive, but are only one possible set. That is why you will gradually build up a set of alternative, say AGD84 Z57, definitions as you open files from various sources - MapInfo may define it with one set of towgs84 parameters while ESRI may use a different set. You may even be asked to supply your preferred parameters if you get data delivered from an airborne contractor in anything other than WGS84 (I am a geophysicist too). I would test things by creating a custom CRS (Settings->Custom CRS) using whichever of the definitions from the above link is appropriate for your data. When you import/open your data (I can't quite recall what exactly it is you where using) you should assign it to the Custom CRS you created. If your Custom CRS database does not appear to be working properly (ie you can see your custom CRS, but it isn't sticking to your data properly), then try to find your custom CRS database (qgis.db in your home directory on Linux, I guess it is in Application Settings or something similar in Windows) and delete it in case you have an old one with an incorrect format. The longer term fix is to install the correct, or at least 'a' correct, version of the AGD66 and AGD84 definitions in the main crs database (srs.db). While you could argue over which towgs84 parameters are better, any would be preferable to the way it is now. The main and custom CRS databases are SQLite3 databases. I might give this a go over the next few days if I get a chance. Also, this page may help to explain some of the Proj4 parameters http://trac.osgeo.org/proj/wiki/GenParms Hope this all makes sense - its getting late. Regards, Roland -- ROLAND HILL Director Four Winds Technology Pty Ltd Ph/Fax : +61 (0)2 6366 9425 Mobile : +61 (0)41 880 7472 roland.h...@fourwindstechnology.com.au Privacy and Confidentiality Notice The information contained herein and any attachments are intended solely for the named recipients. It may contain privileged confidential information. If you are not an intended recipient, please delete the message and any attachments then notify the sender of miss-delivery. Any use or disclosure of the contents of either is unauthorised and may be unlawful. All liability for viruses are excluded to the fullest extent permitted by law. On 22/09/10 19:59, Brett Adams wrote: Gents, Guess I'm wondering what the next step on this topic is. I don't know what to do next. Currently QGIS cannot separate ADG66/ AGD84 /GDA94 in either export or import. If it can, then I haven't seen it and if its that fickle, its way too dangerous for me. Not keen on going to another package as they take time to learn. Is it even an option to sponsor someone to sort this out for me? Technically I'm way over my depth so can't offer many solutions myself. I need some honest answers. Thanks ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Projection of Shapefile export
On 09/22/2010 11:59 AM, Brett Adams wrote: Gents, Guess I'm wondering what the next step on this topic is. I don't know what to do next. Currently QGIS cannot separate ADG66/ AGD84 /GDA94 in either export or import. If it can, then I haven't seen it and if its that fickle, its way too dangerous for me. Not keen on going to another package as they take time to learn. Is it even an option to sponsor someone to sort this out for me? Technically I'm way over my depth so can't offer many solutions myself. I need some honest answers. Thanks Hi Brett: Ken Norris indicated [1] that there might be a general problem transforming from AGD66 or AGD84 (which use the aust_SA ellipsoid) to GDA94 which is based on the GRS80 ellipsoid. He mentioned Oziexplorer which does the transform correctly. To the best of my understanding, proj4 (and thus QGIS) doesn't do any transform between the two. Here's a trivial example. I took a coord pair from the file you posted and ran it thru the proj4 cs2cs utility with epsg:20351 as the source CRS (that's AGD84) and epsg:28351 as the target CRS (GDA94). echo "275635 6411747" | cs2cs +init=epsg:20351 +to +init=epsg:28351 275635.816411759.44 0.00 Note that the resulting X-Y is offset by only about 12 meters. But you're expecting a shift of nearly 200 m. So it seems proj4 is missing here. Normally datum transforms fit into either a 3 parameter or 7 parameter model. It might be that the transform between those datums requires something fancy, or localized that regular datum transforms cannot do. So proj4 just doesn't handle it. The best source for an authoritative answer would, of course, be the Australian govt' mapping agency. If you learn anything more, please let us know... Regards, Micha [1] http://osgeo-org.1803224.n2.nabble.com/Projection-of-Shapefile-export-tp5536736p5552105.html -- Micha Silver Arava Development Co. +972-52-3665918 http://surfaces.co.il ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Re: Reproject WMS
Hallo You are sure it is not the overlay that is reprojected on the fly? I guess that just depends on if you load the wms before the overlay layer or vice verse. Otherwise I learned on FOSS4G that mapproxy can do things like that. If you do the request through mapproxy you can do transformations like that in mapproxy (mapproxy.org). But I suspect that image quality must be quite bad but I have never tried /Nicklas 2010-09-22 Timmie wrote: > > Is it possible for QGIS to add such layer and repoject them to state plane > > on >> > the fly? >> >> afaik it is not possible to reproject WMS layers, you have to stick with >> the SRSs the server makes available. >Sorry, but in the software of some well-known vendor this works. >Overlay matches perfectly with the same service. > > > >___ >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] Re: Reproject WMS
Le 22/09/2010 14:10, Timmie a écrit : Is it possible for QGIS to add such layer and repoject them to state plane on the fly? afaik it is not possible to reproject WMS layers, you have to stick with the SRSs the server makes available. Sorry, but in the software of some well-known vendor this works. Overlay matches perfectly with the same service. Why don't you reproject the overlay to WGS84 ? If overlay is vector data, it is much easier and quicker to reproject. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Re: Reproject WMS
Il 22/09/2010 14:10, Timmie ha scritto: >>> Is it possible for QGIS to add such layer and repoject them to state plane >>> on >>> the fly? >> >> afaik it is not possible to reproject WMS layers, you have to stick with >> the SRSs the server makes available. > Sorry, but in the software of some well-known vendor this works. > Overlay matches perfectly with the same service. however, it makes no sense tyo reproject WMS cleint-side when it can be done server-side (of course, not all servers are configured to provide theyr wms in the projection you need). all the best. -- Paolo Cavallini: http://www.faunalia.it/pc ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Re: Reproject WMS
> Sorry, but in the software of some well-known vendor this works. > Overlay matches perfectly with the same service. if you mean that arc* does raster reprojection I believe we all know that is true as it is also true that at the moment QGIS doesn't reproject on-the fly rasters. I believe also that this feature is on the QGIS roadmap. cheers -- Giovanni -- ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: Reproject WMS
> > Is it possible for QGIS to add such layer and repoject them to state plane > > on > > the fly? > > afaik it is not possible to reproject WMS layers, you have to stick with > the SRSs the server makes available. Sorry, but in the software of some well-known vendor this works. Overlay matches perfectly with the same service. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Reproject WMS
Hi, > Is it possible for QGIS to add such layer and repoject them to state plane on > the fly? afaik it is not possible to reproject WMS layers, you have to stick with the SRSs the server makes available. cheers -- Giovanni -- ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Reproject WMS
Hello, I have a WMS from MSNR (http://msrmaps.com/webservices.aspx) which is served in WGS84. Is it possible for QGIS to add such layer and repoject them to state plane on the fly? What are you ideas to handle this? Best regards, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Projection of Shapefile export
Hi, > Is it > even an option to sponsor someone yes, if it is a bug or a missing feature (sorry, I didn't followed the thread) you can fund QGIS and ask for a specific bug to be squashed or a specific feature to be added http://qgis.org/wiki/Bugs cheers -- Giovanni -- ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Projection of Shapefile export
Gents, Guess I'm wondering what the next step on this topic is. I don't know what to do next. Currently QGIS cannot separate ADG66/ AGD84 /GDA94 in either export or import. If it can, then I haven't seen it and if its that fickle, its way too dangerous for me. Not keen on going to another package as they take time to learn. Is it even an option to sponsor someone to sort this out for me? Technically I'm way over my depth so can't offer many solutions myself. I need some honest answers. Thanks -- Brett Adams Spinifex Geophysics 0438 861 974 SKYPE:brettadams_spinifex ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
