[Qgis-user] scaling bug?

[Werner Macho]

Thx for explaining this ..
So I'd suggest to make other than degrees as the default unit in qgis -
and I'm also with Andreas to issue a warning when loading data outside 
the range.

Should I file it as a bug?
thx again for helping me out

regards
Werner
> Werner Macho skrev:
>> Hi again!
>> Ok I must miss something somewhere..
>> I open QGIS .. Set the project projection to M34.
>> Load the shape file as a vector layer - set the Layer projection to 
>> M34 (missed that before) .. but .. the same happens
>> Project has +proj=tmerc +lat_0=0 +lon_0=16.33333333333333 +k=1 
>> +x_0=750000 +y_0=0 +ellps=bessel 
>> +towgs84=577.326,90.129,463.919,5.137,1.474,5.297,2.4232 +units=m 
>> +no_defs
>> Layer CRS is +proj=tmerc +lat_0=0 +lon_0=16.33333333333333 +k=1 
>> +x_0=750000 +y_0=0 +ellps=bessel 
>> +towgs84=577.326,90.129,463.919,5.137,1.474,5.297,2.4232 +units=m 
>> +no_defs
>>
>> Beat me but where can i find the "coordinate transformation turned 
>> on?" switch?
>>
> The last part is the key to the entire mystery! :-)
>
> When you install QGIS, degrees is the default unit, and it tells QGIS 
> that any coordinate in your layer is in degrees. As you have large 
> >>360 values of coordinates, the scale calculation breaks down. 
> Calculating scale is done by projecting coordinates sin the center of 
> the canvas
> to an ellipsoid. Hairy stuff. This projection is not reliable with 
> unrealistic values. Remember QGIs thinks that your coordinate (6848, 
> 272169) is in degrees.
>
> Now, you can either change this to meter manually in the option dialog 
> OR you can turn on projection (top left corner in dialog where you 
> select project CRS in project properties). In the last case, the unit 
> is set to what the project projection ("+units=m") says.
>
> Hope this explains it all.
>
> magnus