Hello All,
I’m trying to do some simulation of view in NVIZ and I have to look an object at a fix distance from a fix point… so I usually use the “position” panel (where I can set coords and elevation of the two points) but sometimes it happens that when you obtain this view you see some white space under your “feet” so I tried to avoid this modifying the perspective parameter (slide in the main panel).
Doing this I noted that if I modify the perspective parameter the distance of observation changes; what does this angle represent? who can explain me its specific meaning? and why if I increase/diminish it the observed object goes/comes far/near?
Thank you in advance.
Annalisa
Hi Annalisa,
On Tue, Jul 14, 2009 at 9:36 AM, Annalisa Minelli<annagrass6@gmail.com> wrote:
Hello All,
I'm trying to do some simulation of view in NVIZ and I have to look an
object at a fix distance from a fix point.. so I usually use the "position"
panel (where I can set coords and elevation of the two points) but sometimes
it happens that when you obtain this view you see some white space under
your "feet" so I tried to avoid this modifying the perspective parameter
(slide in the main panel).
Doing this I noted that if I modify the perspective parameter the distance
of observation changes; what does this angle represent? who can explain me
its specific meaning? and why if I increase/diminish it the observed object
goes/comes far/near?
the tcltk nviz isn't "the future", perhaps you could try the new nviz based
on python? It can be controlled via command line which might help a lot.
Markus
Thanks Markus,
I’ll try and see if it this way can clear up my theoretical-doubts.
Annalisa
2009/7/15 Markus Neteler <neteler@osgeo.org>
Hi Annalisa,
On Tue, Jul 14, 2009 at 9:36 AM, Annalisa Minelli<annagrass6@gmail.com> wrote:
Hello All,
I’m trying to do some simulation of view in NVIZ and I have to look an
object at a fix distance from a fix point… so I usually use the “position”
panel (where I can set coords and elevation of the two points) but sometimes
it happens that when you obtain this view you see some white space under
your “feet” so I tried to avoid this modifying the perspective parameter
(slide in the main panel).
Doing this I noted that if I modify the perspective parameter the distance
of observation changes; what does this angle represent? who can explain me
its specific meaning? and why if I increase/diminish it the observed object
goes/comes far/near?
the tcltk nviz isn’t “the future”, perhaps you could try the new nviz based
on python? It can be controlled via command line which might help a lot.
Markus
...and keep table data
Hi,
I am going to merge some vector areas sharing a common value. I want to
keep the information in my table, but I can't find a way to "stamp out"
the desired areas and "replace" them with desired information.
Is there something like union touching areas and keep information (table
entries, cat) of one of them I have not seen?
Thanks in advance,
achim
Ok. I did it with:
v.extract: extracting the areas I dont want to merge
v.overlay: union the extracted with the dissolved rest
so I keep the information of the not-to-be-merged areas. Only thing is,
that I have to generate some new information for the dissolved areas. In
this case its not that necessary.
But: I am still looking for a straight way to merge some (eg. 2)
connected areas and keep the information of one of them!
achim
achim schrieb:
...and keep table data
Hi,
I am going to merge some vector areas sharing a common value. I want to
keep the information in my table, but I can't find a way to "stamp out"
the desired areas and "replace" them with desired information.
Is there something like union touching areas and keep information (table
entries, cat) of one of them I have not seen?
Thanks in advance,
achim
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