thank you michael,
I learned a lot from your suggestions ( I also refreshed my knowledge
about projections) and I improved my capacity with qgis.
In fact I did not solve the problem of overlap my files with different
original projection (UTM Shapefile and WGS84 geoTIFF & shapefile)
even if now they output in a closer position.
I guess now that as you suggested one of the two groups are not
correcly referenced. I will discuss with providers.
Now a further question. I opened qgis prefs and set the locale to
"IT" or "it" (italian). The first gave russian characters as local;
I gor back to preferences and I looked for "en" again but it had
disapeared so I tried the second wich is is realy italian.
But in this way I find impossible to get back to preferences because
it is grayed... Is it a bug? I tried also via keyboard (command ,)
with no response. How to go to preferences ?
Thank you all
Bernardo
Il giorno 08/ott/08, alle ore 21:29, Michael Neubauer ha scritto:
Hello Bernando,
first: When you change the projection (or better "spatial reference
system")
in the project properties, it does not change the "spatial reference
system"
in the data of your layer. Transforming your data to another "spatial
reference system" would be a more complicated operation.
But the good thing is, that with OTF activated, you do not have to
do that and
you can superpone layers in different "spatial reference systems".
So do not wonder that the projection of your layer stays the same,
when you
change the projection of the whole project. Changing the projection
of the
whole project should only have an effect on the coordinates which are
displayed (right bottom of the screen)
second: UTM is a "projected coordinate system" in contrast to
"geographic
coordinate systems". "Geographic coordinate systems" treat the earth
like a
sphere and work with degrees. "Projected coordinate systems" project
the
spere (ball earth :-) ) on a flat surface and deal with other
numbers, which
are defined in each coordinate system differently.
UTM stands for "Universal Transverse Mercator" and you find it at
the bottom
of "projected coordinate systems" in QGIS (between "geographic
coordinate
systems" and "user defined coordinate systems").
So you have to look for "WGS84 / UTM zone 32N" --> N for northern
hemisphere.
So I hope that practical and theoretical information helps... :-)
Let me know if everything works
bye
michael
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