[Qgis-user] Projection problem in QGIS 1.7.2 between EPSG 31370 and EPSG:3035

[Paul Lens]

Thanks a lot to Giovanni for having checked.

I wondered where the difference of behaviour comes from.

In fact, when the CRS is set in project properties TO EPSG: 3035, both 
shapefiles match as Giovanni noticed it. But when the project-wide CRS 
is set to EPSG: 31370, the shift appears.

Here is a link to both screenshots: 
http://www.yousendit.com/download/T2dlak80YXliR0pBSXRVag.

As I explained in a former mail, this shift appears in QGIS 1.7.2 and 
not in 1.6.

If you want to have a try, here are the links to the freely donwloadable 
shapefiles:
       - belgian (Walloon Region) Natura 2000 limits:
http://environnement.wallonie.be/cartosig/telechargement/NATURA2000_DIFFUSION_BASE_MARS2010.zip 

use "NATURA2000_PERIMETRES.shp".

       - european Natura 2000 limits:
www.eea.europa.eu/data-and-maps/data/natura-2000     (I use the 2009
version)

NB: I can manage without the european data. I reported this as it might 
help bug tracking and debugging.

Is this a bug of 1.7.2.? Should I file a ticket?

Thanks for all


Paul

On 20/12/2011 15:06, Giovanni Manghi wrote:
> Hi,
>
> beside the expected differences because the layers are from different
> sources, I can't see any particular shift
>
> http://ubuntuone.com/7TJnox4OFSxdMaPteNMsW9
>
>
> cheers
>
>
> -- Giovanni --
>
>
> On Mon, 2011-12-19 at 21:25 +0100, Paul Lens wrote:
>> Hi,
>>
>> When I open projects saved earlier in QGIS 1.6 with 1.7.2, there is a
>> shift between the belgian data, projected with EPSG 31370 (Belgian
>> Lambert 72 conformal conic), and the european environmental agency data
>> using  EPSG:3035 - ETRS89 / ETRS-LAEA.
>> The european shapefile is shifted 103m: X: 94m westward; Y: 64m northward.
>>
>> Here are the links to the freely donwloadable shapefiles:
>>       - belgian (Walloon Region) Natura 2000 limits:
>> http://environnement.wallonie.be/cartosig/telechargement/NATURA2000_DIFFUSION_BASE_MARS2010.zip
>>
>>       - european Natura 2000 limits:
>> www.eea.europa.eu/data-and-maps/data/natura-2000     (I use the 2009
>> version)
>>
>> This seems to be a bug of QGIS 1.7.2. as I experienced no shift with
>> QGIS 1.6, or do I miss something?
>>
>>
>> Paul
>>
>> NB: QGIS 1.7.2 opens without problem an older project on the
>> french-belgian border, where I experienced a shift between EPSG 31370
>> and the different french Lambert projections.
>>
>> FIY: this was then solved thanks to ticket OSGEO 3362 by making a custom
>> projection with a minus sign added to one of the elements:
>>
>> Custom projection:
>> +proj=lcc +lat_1=51.16666723333333 +lat_2=49.8333339 +lat_0=90
>> +lon_0=4.367486666666666 +x_0=150000.013 +y_0=5400088.438 +ellps=intl
>> +towgs84=-106.8686,52.2978,-103.7329,0.3366,-0.457,1.8422,-1.2747
>> +units=m +no_defs
>>
>> EPSG 31370:
>>    +proj=lcc +lat_1=51.16666723333333 +lat_2=49.8333339 +lat_0=90
>> +lon_0=4.367486666666666 +x_0=150000.013 +y_0=5400088.438 +ellps=intl
>> +towgs84=-106.869,52.2978,-103.724,0.3366,-0.457,1.8422,1.2747 +units=m
>> +no_defs
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>
>