[Qgis-user] Converting to another projection !

[drruddy gmail]

Hi Chuck,

Is the problem file raster or vector?

The fact that QGIS is getting the on-the-fly transformation right for 3 files but not the 4th suggests there’s something peculiar about the spatial reference for that 4th file. Are you sure all 4 user defined files have gone through the same set of processes?

Thinking about things I would do…

1) Check the meta-data and/or with the data provider to determine whether your problem file has been treated differently. Obtain the correct CRS details from your data provider if the file is a special case. You can then define the CRS on import (with on-the-fly switched off).

2) If you don’t have a means to find out what sort of processing these files have already gone through you could try and predict what the correct CRS for it would be. I’m not too familiar with US mapping but I understand that each state can have it’s own CRS (?). Maybe a muddle has occurred and you problem file has been given he wrong CRS in this way.

If the file is very big I would also maybe re-save a selection to give a file that’s easier to work with. Then try and troubleshoot on this small file.

Can’t think of anything else off hand. Hope that helps get you towards a solution. Let us know how you get on.

MR

On 30 January 2015 at 07:10:10, Chuck Young (wylie1066 at gmail.com) wrote:

MR:  I am trying the same thing using your recommendation of saving the files as a new set and changing the projection . It seemed to work on several layers but I have one that it just refuses to work on.  It is a large set and as long as I load a vector layer in the ESRI format it will pop into place following the previous layers as I have on the fly projection turned on.  However, I reallly am trying to get all layers into the Spatialite DB and all the rest go in and display as they should.  This one either crashes on import or sets a layer that is way off the screen and a different scale.

What I have are 4 layers that originated from a user defined projection and the rest are Tiger file format NAD 83.  Then some layers that I have created based on the Tiger layers.

The unruly layer is from the user defined set.

I have tried re-saving it about 6 times from different angles and still it comes up wrong. That is puzzling as it is from a set where the other three work wonderfully.

Any ideas will be much appreciated.

Thanks

Chuck

On Thu, Jan 29, 2015 at 1:58 AM, drruddy gmail <drmarkruddy at gmail.com> wrote:
Hi Akalya,

when asking a question, it’s always good practice to describe exactly *what* you have attempted in order to help list members to answer your question accurately and rapidly.

In your current case, what methods you have used to attempt the conversion in QGIS and the source and target coordinate reference systems (CRS) should be enough. 

The QGIS version and operating system are always good bits of additional information as is the sources of information you have used to try and solve the problem yourself.

I don’t know what the abbreviation ‘DS’ means. But from what you describe you should resave the shapefile you’re interested in as a new shapefile. You will be able to change the CRS whilst resaving. Open the newly saved shapefile in QGIS and it will now have the CRS you chose.


MR


On 29 January 2015 at 09:36:03, Akalya Anandharaj (akalya.anandharaj at lynxanalytics.com) wrote:

Hi ,

I have a shape file of user defined projection and I am trying to convert to WGS84. I have tried all ways of conversion possible. But still when I try to view the DS, it isn't changed. Can someone please help .need it asap


Thanks,
Akalya
_______________________________________________
Qgis-user mailing list
Qgis-user at lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user

_______________________________________________
Qgis-user mailing list
Qgis-user at lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20150130/23fbea25/attachment.html>