Is not possible to see a 3D map with colours??
What I want is obtain a 3D map starting by a table of points x, y ,z. Is
it possible with GRASS?
Thanks!
Tiago
-----Original Message-----
From: owner-GRASSLIST@baylor.edu [mailto:owner-GRASSLIST@baylor.edu] On
Behalf Of Eva L. Hulse
Sent: quinta-feira, 10 de Novembro de 2005 20:56
To: 1010664@isep.ipp.pt
Cc: grasslist@baylor.edu
Subject: [GRASSLIST:8988] Re: v.in.ascii error
You don't have to worry about most of those fields. You can just do:
g.region vect=testar1_out
eva.
Tiago Salgueiro wrote:
I think it works because now I didn't got any error.
But I don't know how to see the map. I tryed g.region but I don't know
what to put in all fields... Can you help?
Thanks!
Tiago
--
---------------------------------------------
Eva L. Hulse
PhD Student
University at Buffalo Anthropology Department evahulse@buffalo.edu
Name of the vector file with input data: <your_vector>
Field value: 0
Maximum distance between points on isoline: use default value to start with. You can try different numbers.
Minimum distance between points on isoline: use default value to start with. You can try different numbers.
Output surface raster file (elevation): my_new_3D_surface
Conversion factor for interpolated values: 1.0 (default)
Tension: 40 (default). You can try different numbers.
Max number of points in segment: Use a number equal to or larger than the number of points in your file.
Min number of points for interpolation: Use a number larger than "max number of points in segment"
2) Use NVIZ to view your new raster map
nviz elevation=my3Dsurface
You will want to adjust the relative size of the z-values in the control panel, probably.
Tiago Salgueiro wrote:
Ok finally I see something...
Is not possible to see a 3D map with colours??
What I want is obtain a 3D map starting by a table of points x, y ,z. Is
it possible with GRASS?
Thanks!
Tiago
---------------------------------------------
Eva L. Hulse
PhD Student
University at Buffalo Anthropology Department
evahulse@buffalo.edu
Thank you I did it and works perfectly.
Now when I try with a bigger .txt file v.in.ascii works but when I made
v.surf.rst I received an warning:
coor files of vector 'testev_out@salgueitteste' is larger than it should
be (14 bytes excess).
Percent complete: Reading lines from vector map ... Reading nodes from
vector map ...
ERROR2: zero points in the given region!
Input failed
How can I do that with a bigger file? My objective is process bathymetric
data. For example:
I have a txt file with thousands of points x, y and z that were measured
with a sonar or something and my mission is to convert the points into a
map of the river's deep. Can I do this easily?
Thanks again!
Tiago
for a 3D map with colors, you need to do 2 more things:
1) Create a continuous raster from your vector z-values with v.surf.rst.
Name of the vector file with input data: <your_vector>
Field value: 0
Maximum distance between points on isoline: use default value to start
with. You can try different numbers.
Minimum distance between points on isoline: use default value to start
with. You can try different numbers.
Output surface raster file (elevation): my_new_3D_surface
Conversion factor for interpolated values: 1.0 (default)
Tension: 40 (default). You can try different numbers.
Max number of points in segment: Use a number equal to or larger than
the number of points in your file.
Min number of points for interpolation: Use a number larger than "max
number of points in segment"
2) Use NVIZ to view your new raster map
nviz elevation=my3Dsurface
You will want to adjust the relative size of the z-values in the control
panel, probably.
Tiago Salgueiro wrote:
Ok finally I see something...
Is not possible to see a 3D map with colours??
What I want is obtain a 3D map starting by a table of points x, y ,z. Is
it possible with GRASS?
Thanks!
Tiago
---------------------------------------------
Eva L. Hulse
PhD Student
University at Buffalo Anthropology Department
evahulse@buffalo.edu
coor files of vector 'testev_out@salgueitteste' is larger than it
should be (14 bytes excess).
Strange. Try v.info (make sure there is something there), v.build,
v.clean.
My objective is process bathymetric data. For example:
I have a txt file with thousands of points x, y and z that were
measured with a sonar or something and my mission is to convert the
points into a map of the river's deep. Can I do this easily?
GRASS 6's v.in.ascii handles many thousands of data points very easily.
Once you bigger than several million data points you will start running
out of system memory.
One missing piece of the puzzle for high-density sidescan sonar and
LIDAR data sets is a GRASS 5.4->6 port of s.cellstats for binning point
data into raster cells (sum, min, max, mean, mode, etc in each cell).
If you are dealing with data sets that huge (many millions of points),
you might want to use GRASS 5.4 for that part of the processing and then
switch over to GRASS 6 once you have made your raster maps.
My problem is not running v.in.ascii. This command works fine but after,
when I tried v.surf.rst the program gave this warning and ask me to run
v.build. I did that and tried v.surf.rst again. Now program didn't ask to
run v.build but the error appears. Can it be some parameter wrong in
v.surf.rst command??
Thanks,
Tiago
coor files of vector 'testev_out@salgueitteste' is larger than it
should be (14 bytes excess).
Strange. Try v.info (make sure there is something there), v.build,
v.clean.
My objective is process bathymetric data. For example:
I have a txt file with thousands of points x, y and z that were
measured with a sonar or something and my mission is to convert the
points into a map of the river's deep. Can I do this easily?
GRASS 6's v.in.ascii handles many thousands of data points very easily.
Once you bigger than several million data points you will start running
out of system memory.
One missing piece of the puzzle for high-density sidescan sonar and
LIDAR data sets is a GRASS 5.4->6 port of s.cellstats for binning point
data into raster cells (sum, min, max, mean, mode, etc in each cell).
If you are dealing with data sets that huge (many millions of points),
you might want to use GRASS 5.4 for that part of the processing and then
switch over to GRASS 6 once you have made your raster maps.
I can't help with the warning about the file being larger than it should
be. But, did you use g.region to set the region to match your new,
large vector file? If you are still using the small test region,
v.surf.rst won't look at all (or any!) of your new points.
eva.
Quoting Tiago Salgueiro <1010664@isep.ipp.pt>:
Thank you I did it and works perfectly.
Now when I try with a bigger .txt file v.in.ascii works but when I
made
v.surf.rst I received an warning:
coor files of vector 'testev_out@salgueitteste' is larger than it
should
be (14 bytes excess).
Percent complete: Reading lines from vector map ... Reading nodes
from
vector map ...
ERROR2: zero points in the given region!
Input failed
How can I do that with a bigger file? My objective is process
bathymetric
data. For example:
I have a txt file with thousands of points x, y and z that were
measured
with a sonar or something and my mission is to convert the points
into a
map of the river's deep. Can I do this easily?
Thanks again!
Tiago
********************
Eva Hulse
evahulse@buffalo.edu