[Qgis-user] gfx in WSG 84 added to another CRS (EPSG:3021)

[Johan Nilsson]

Hi.
Now I have found how I get all tings backwards and wrong :)
By just going to *Settings-->Options-->CRS*, does NOT change the current
project, of course.... For that you need to go to *File-->Project properties
*. Thanks for your time

Cheers.

2012/9/23 Johan Nilsson <joni8135 at gmail.com>

> If i said in the beguinning of my post I can transform, by save layer as
> shape, and there choose the RT90 coordinate-system (it say it is in wsg
> 84). It just when I add a different layer, the transformation to metric
> system, it's fail.
>
> /Cheers
>
> ---------- Forwarded message ----------
> From: Bo Victor Thomsen <bo.victor.thomsen at gmail.com>
> Date: 2012/9/23
> Subject: Re: [Qgis-user] gfx in WSG 84 added to another CRS (EPSG:3021)
> To: Johan Nilsson <joni8135 at gmail.com>
>
>
>
> The QGIS on-the-fly re-projection mechanism is able to manage both
> different ellipsoids, projections and coordinate units.
> Could the definition of EPSG:3021 in QGIS be wrong ? I'm am 100% sure,
> that QGIS handles lat/long wgs84 (EPGS:4326) correct. What happens if you
> convert and re-project the GPX file to shape/EPSG:3021 with ex. *ogr2ogr*(
> www.gdal.org - no QGIS involved). Is your converted data then placed
> correctly ?
>
> Regards
> Bo Victor Thomsen
>
>
> 09-2012 13:16, Johan Nilsson skrev:
>
> Don't work
> May it be that CRS have at least to components? Projections (Shape-models
> of the earth) and Coordinate-system (defined as a grid from Equator and
> Greenwich, but different according to the place on earth), and Enable 'on
> the fly' reprojections don't change units from degrees to the metric
> Coordinat-system?
>
> /Cheers
>
> 2012/9/21 Bo Victor Thomsen <bo.victor.thomsen at gmail.com>
>
>>
>>    1. Choose a CRS for your _project_ using the menu "Settings" -->
>>    "Project properties" --> Tab "Coordinate Reference System (CRS) and choose
>>    the CRS from the dialog. Remember to enable "on the fly CRS transformation"
>>    2. Open your layer(s). Don't think about the projection here.
>>     3. Right-click on each of your layer(s) in the "Layers" dialog and
>>    choose "Set layer CRS". If necessary, choose the CRS for the individual
>>    layer.
>>
>> In some cases the CRS for a layer can't be inferred from the information
>> in the layer's datafile or QGIS can't read it correctly. Executing step 3
>> for each "problem" layer corrects this problem.
>>
>> Regards
>> Bo Victor Thomsen
>> Aestas-GIS
>> Denmark
>>
>>
>> Den 21-09-2012 09:23, Johan Nilsson skrev:
>>
>> When I click Layer-->'Add vector layer.....' I can browse for files, shp,
>> gpx, and so on, but never chose an CRS in that menu. My Background map are
>> in RT90 coordinate system in meters approx 1500000,6500000 m but gpx files
>> come to 17  and 60 m (not degree), way ot of the map...
>>
>>
>> /Cheers
>>
>> 2012/9/21 leyan ouyang <ouyang.leyan at hotmail.com>
>>
>>>  Yes it is possible, the option "on-the-fly reprojection" does just
>>> that. Choose the main CRS as the project CRS (it will be used for distance
>>> calculations, etc.). Then when you add a layer you can choose its CRS
>>> individually, QGIS will do the transformation.
>>>
>>> Regards,
>>>
>>> Leyan
>>>
>>>  ------------------------------
>>> Date: Fri, 21 Sep 2012 09:08:05 +0200
>>> From: joni8135 at gmail.com
>>> To: qgis-user at lists.osgeo.org
>>> Subject: [Qgis-user] gfx in WSG 84 added to another CRS (EPSG:3021)
>>>
>>>
>>> Hi.
>>> I can transform gpx file from a GPS (WSG84) to an old swedisch CSR
>>> EPSG:3021 (RT90 2,5 gon V metric coordinate system)) shape file, but I
>>> whant to let the program transform on the fly.
>>>
>>>  I know that year 1999 Silicon graphic had it on there 'super
>>> coomputers' and GIS-softwate, and I also see that QGIS have under menue:
>>> *Settings-->Options-->CRS*-tab have an option to check 'on the fly
>>> reprojection' in option.
>>>
>>> Under options-->CRS can you define default project CRS and defaut CRS to
>>> what your add in layers, but If you have a lot of old files with diffenent
>>> CRS it could be errors. Now Sweden is in transition from RT90 to SweRef99
>>> (very near WSG84)
>>>
>>> Is it possible to add vector files with other CRS, or even rasters to a
>>> project without transform it?
>>>
>>> /Cheers
>>>
>>>
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>>
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