Hi, i'm new to Grass and Gis in general. I've got a
map of a small city(a dwg file), i've compiled Grass
6.0 with opendwg support and opened the map. I've got
a file with Gauss Boaga coordinates of buildings in
this city and i'd like to import these points in the
map and locate them. What do i have to do ? I try
searching manuals and tutorials but i can't manage to
solve my problem.
Thank you very much for help
Andrea
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Andea, I don't know much about Gauss Boaga, but if it is in a different projection than your city file (i.e. latitude-longitude vs. utm), then create a new location that will match the buildings data. From there you can use v.proj in either location to project the data to the other location.
Hope this helps,
Ian
On Nov 17, 2005, at 8:44 AM, andrea pastino wrote:
Hi, i'm new to Grass and Gis in general. I've got a
map of a small city(a dwg file), i've compiled Grass
6.0 with opendwg support and opened the map. I've got
a file with Gauss Boaga coordinates of buildings in
this city and i'd like to import these points in the
map and locate them. What do i have to do ? I try
searching manuals and tutorials but i can't manage to
solve my problem.
Thank you very much for help
Andrea
___________________________________
Yahoo! Mail: gratis 1GB per i messaggi e allegati da 10MB
http://mail.yahoo.it
>
What happens if a big asteroid hits Earth? Judging from realistic simulations involving a sledge hammer and a common laboratory frog, we can assume it will be pretty bad.
- Dave Barry
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Thank you for help ! I managed to import points with
v.in.ascii command.
I've got another question : how can i compute
distances between the points?
Given two points with Gauss Boaga coordinates what's
their distance in km?
Thank you in advance
Andrea
--- Ian MacMillan <ian_macmillan@umail.ucsb.edu>
Andea, I don't know much about Gauss Boaga, but if
it is in a different
projection than your city file (i.e.
latitude-longitude vs. utm), then
create a new location that will match the buildings
data. From there
you can use v.proj in either location to project the
data to the other
location.
Hope this helps,
Ian
On Nov 17, 2005, at 8:44 AM, andrea pastino wrote:
> Hi, i'm new to Grass and Gis in general. I've got
a
> map of a small city(a dwg file), i've compiled
Grass
> 6.0 with opendwg support and opened the map. I've
got
> a file with Gauss Boaga coordinates of buildings
in
> this city and i'd like to import these points in
the
> map and locate them. What do i have to do ? I try
> searching manuals and tutorials but i can't manage
to
> solve my problem.
> Thank you very much for help
> Andrea
>
>
>
>
>
>
> ___________________________________
> Yahoo! Mail: gratis 1GB per i messaggi e allegati
da 10MB
> http://mail.yahoo.it
>
>
>
>
What happens if a big asteroid hits Earth? Judging
from realistic
simulations involving a sledge hammer and a common
laboratory frog, we
can assume it will be pretty bad.
- Dave Barry
-------------------------------------------------------------
This message has been scanned by Postini anti-virus
software.
___________________________________
Yahoo! Mail: gratis 1GB per i messaggi e allegati da 10MB
http://mail.yahoo.it
Maybe i made a silly question : given A and B distance
is sqrt( (xa-xb)^2 + (ya - yb)^2 ) but i wanted to
know if i need any correction parameter.
i still don't manage to compute distances in grass.
thank you very much and sorry for new mail
Andrea
--- andrea pastino <pennyw81@yahoo.it> ha scritto:
Thank you for help ! I managed to import points with
v.in.ascii command.
I've got another question : how can i compute
distances between the points?
Given two points with Gauss Boaga coordinates what's
their distance in km?
Thank you in advance
Andrea
--- Ian MacMillan <ian_macmillan@umail.ucsb.edu>
> Andea, I don't know much about Gauss Boaga, but if
> it is in a different
> projection than your city file (i.e.
> latitude-longitude vs. utm), then
> create a new location that will match the
buildings
> data. From there
> you can use v.proj in either location to project
the
> data to the other
> location.
>
> Hope this helps,
> Ian
>
> On Nov 17, 2005, at 8:44 AM, andrea pastino wrote:
>
> > Hi, i'm new to Grass and Gis in general. I've
got
> a
> > map of a small city(a dwg file), i've compiled
> Grass
> > 6.0 with opendwg support and opened the map.
I've
> got
> > a file with Gauss Boaga coordinates of buildings
> in
> > this city and i'd like to import these points in
> the
> > map and locate them. What do i have to do ? I
try
> > searching manuals and tutorials but i can't
manage
> to
> > solve my problem.
> > Thank you very much for help
> > Andrea
> >
> >
> >
> >
> >
> >
> > ___________________________________
> > Yahoo! Mail: gratis 1GB per i messaggi e
allegati
> da 10MB
> > http://mail.yahoo.it
> >
> >
> >
> >
> What happens if a big asteroid hits Earth? Judging
> from realistic
> simulations involving a sledge hammer and a common
> laboratory frog, we
> can assume it will be pretty bad.
> - Dave Barry
>
>
>
-------------------------------------------------------------
> This message has been scanned by Postini
anti-virus
> software.
>
>
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10MB
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andrea pastino wrote:
Maybe i made a silly question : given A and B distance
is sqrt( (xa-xb)^2 + (ya - yb)^2 ) but i wanted to
know if i need any correction parameter.
i still don't manage to compute distances in grass.
thank you very much and sorry for new mail
For small distances, the plane distance (Pythagoras) is adequate. For
longer distances, you have to convert the coordinates to lat/lon and
compute the geodesic (great circle) distance.
Look at the functions in lib/gis/geodist.c for reference.
--
Glynn Clements <glynn@gclements.plus.com>