[Qgis-user] Projection of Shapefile export

[Micha Silver]

Brett Adams wrote:

>  Micha,
> Sorry but I can't get your suggestions to work. I tried this a couple 
> of times but it fails every time.
>
> Settings->Options-CRS window is already set to "Prompt for CRS"
And when you next import the csv, does it indeed prompt for the CRS?
>
> Tried changing the global to AGD84 / AMG zone 51, when I reopen the 
> window its set to AGD66 so this setting is not holding.
Weird. There's no permissions problems?
>
> When I reimport the the CSV file the default is still WGS84, despite 
> the global been set to AGD84 (or is it AGD66, I can't be sure). Again 
> I select AGD84.
>
> Layer > Properties > Specify CRS comes up as AGD66. Changed it to AGD84
>
> When I export the layer, I'm again asked to specify the projection, AGD84
>
> Exported *.prj file still has a datum of "D_unknown". Upon import of 
> the shape file, my version of QGIS will now default this to AGD84 
> however as the *.prj file is wrong it no good to anyone else.
Here's the prj that I'm getting:

PROJCS["UTM Zone 51, Southern Hemisphere",GEOGCS["Australian Natl & S. 
Amer. 1969",DATUM["D_unknown",SPHEROID["aust_SA",6    
378160,298.25]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["l    
atitude_of_origin",0],PARAMETER["central_meridian",123],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000    
],PARAMETER["false_northing",10000000],UNIT["Meter",1]]

What should it be? Even tho' it's called "D_unknown" all the parameters 
seem to be there.

>
>
>
> The only real work around I have so far is to delete the *.prj file 
> and then specify the projection on import.
>
>
>
>
> On 19/09/2010 2:35 PM, Micha Silver wrote:
>> Micha Silver wrote:
>>
>>> Brett Adams wrote:
>>>
>>>> Micha,
>>>> I've attached csv data for importing and all shape files exported. 
>>>> I've added comments into your prior email also.
>>>>
>>> Hi Brett:
>>>
>>> I do indeed see a problem exporting to the AGD84 CRS. I get a 
>>> "Latitude or Longitude exceeds limits" error. This happens when the 
>>> global CRS is set to WGS84 (which is the default in QGIS). Attached 
>>> is a screen shot of the error.
>>>
>>> Here's how to overcome the problem: Change your Global CRS to AGD84 
>>> zone 51 (BTW, that's EPSG code 20351). This is done in the 
>>> Settings->Options->CRS dialog window. Now re-import the csv file and 
>>> then save as shapefile and you should be able to select the AGD84 
>>> CRS and have it saved correctly.
>>> Alternatively, if you don't want to change the global CRS setting, 
>>> you can select (in the same Settings->Options-CRS window) to "Prompt 
>>> for CRS".  Then when you import the csv you'll be asked to specify 
>>> the correct CRS for the points, You again select AGD84 and all 
>>> should be well.
>>>
>>> Cheers,
>>> Micha
>>>
>> And just to complete the picture, Jurgen reminded me that in recent 
>> versions there's a setting for each layer to set what CRS it is. This 
>> is found in the Layer->properties window, General tab. Click on the 
>> button "Specify CRS" and choose the correct coordinate system. You 
>> can do this also for a delimited text file layer.  Then export to 
>> shapefile works as you'd expect..
>
>