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<div class="moz-cite-prefix">Hi Tim,<br>
<br>
If you read more closely the bug report, you will see that there
are no Numeric components in NumPy 1.9 to install, simply because
they are <b>dropped</b> from NumPy.<br>
The problem is not visible in other distributions because they
still use NumPy 1.8.x <br>
Hopefully there will be a wx patch soon (or even better an
upstream release fixing this)<br>
<br>
<br>
On 11/30/2014 03:44 PM, Tim Southern wrote:<br>
</div>
<blockquote
cite="mid:521B2F7A-A2B4-41C3-BF28-C6F655FB3973@talktalk.net"
type="cite">
<pre wrap="">Hi Angelos,
Sorry but 13.2 Install does installs Numpy but DOES NOT iINSTALL Numeric or Numarray components. Installing Grass on this system does not add these missing NumPy components. Wxpython GUI crashes with missing NumPy components. I will revert back to 13.1 for now as at least that allows me to use Grass.
Thanks for trying to help.
Kind regards
Tim
Tim Southern
17, Park Close,
Sonning Common,
Oxfordshire
RG4 9RY
</pre>
<blockquote type="cite">
<pre wrap="">On 30 Nov 2014, at 05:02, <a class="moz-txt-link-abbreviated" href="mailto:grass-user-request@lists.osgeo.org">grass-user-request@lists.osgeo.org</a> wrote:
Send grass-user mailing list submissions to
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Today's Topics:
1. Re: Grass 6.4, Opensuse 13.1/13.2 (Angelos Tzotsos)
2. mapping interface (shashank khare)
3. Re: how to change all cats in a vector line
(C?sar Augusto Ram?rez Franco)
4. Re: grass-user Digest, Vol 103, Issue 47 (Michael Barton)
----------------------------------------------------------------------
Message: 1
Date: Sun, 30 Nov 2014 05:16:07 +0200
From: Angelos Tzotsos <a class="moz-txt-link-rfc2396E" href="mailto:gcpp.kalxas@gmail.com"><gcpp.kalxas@gmail.com></a>
To: <a class="moz-txt-link-abbreviated" href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a>
Subject: Re: [GRASS-user] Grass 6.4, Opensuse 13.1/13.2
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:547A8BF7.3090306@gmail.com"><547A8BF7.3090306@gmail.com></a>
Content-Type: text/plain; charset=windows-1252; format=flowed
Problem fixed on both openSUSE 13.1 and 13.2
Can you please confirm?
On 11/30/2014 01:43 AM, Angelos Tzotsos wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi Tim,
I will have a look at this and report back.
Cheers,
Angelos
On 11/29/2014 03:32 PM, Tim Southern wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Dear all,
A couple of weeks ago I made the mistake of upgrading Opensuse on
this 32 Toshiba Laptop to 13.2. Grass failed to work with error
messages indicating NumPy had not been installed. It had been
installed but did not contain the files Grass was looking for.
Attempts at removing and re-installing NumPy all produced the same
incomplete file set. (i586 installation)
I have reverted to Opensuse 13.1 and now have another non working
version Grass 6.4
Traceback (most recent call
GRASS 6.4.3 (South_Oxfordshire):~ > Traceback (most recent call last):
File "/opt/grass/etc/wxpython/wxgui.py", line 139, in <module>
sys.exit(main())
File "/opt/grass/etc/wxpython/wxgui.py", line 132, in main
app = GMApp(workspaceFile)
File "/opt/grass/etc/wxpython/wxgui.py", line 45, in __init__
wx.App.__init__(self, False)
File
"/usr/lib/python2.7/site-packages/wx-2.8-gtk2-unicode/wx/_core.py",
line 7981, in __init__
self._BootstrapApp()
File
"/usr/lib/python2.7/site-packages/wx-2.8-gtk2-unicode/wx/_core.py",
line 7555, in _BootstrapApp
return _core_.PyApp__BootstrapApp(*args, **kwargs)
File "/opt/grass/etc/wxpython/wxgui.py", line 78, in OnInit
workspace = self.workspaceFile)
File "/opt/grass/etc/wxpython/lmgr/frame.py", line 111, in __init__
self.toolbars = { 'workspace' : LMWorkspaceToolbar(parent = self),
File "/opt/grass/etc/wxpython/lmgr/toolbars.py", line 40, in __init__
self.InitToolbar(self._toolbarData())
File "/opt/grass/etc/wxpython/gui_core/toolbars.py", line 96, in
InitToolbar
self.CreateTool(*tool)
File "/opt/grass/etc/wxpython/gui_core/toolbars.py", line 120, in
CreateTool
shortHelp, longHelp)
File
"/usr/lib/python2.7/site-packages/wx-2.8-gtk2-unicode/wx/_controls.py",
line 3764, in AddLabelTool
shortHelp, longHelp, clientData)
File
"/usr/lib/python2.7/site-packages/wx-2.8-gtk2-unicode/wx/_controls.py",
line 3686, in DoAddTool
return _controls_.ToolBarBase_DoAddTool(*args, **kwargs)
ValueError: invalid null reference in method 'ToolBarBase_DoAddTool',
expected argument 4 of type 'wxBitmap const &'
I am assuming both the errors in 13.2 and now in 13.1 are due to
installation issues. Grass 6.4 worked well in 13.1 until I
upgraded. Can anyone help?
Thanks
Tim
Tim Southern
17, Park Close,
Sonning Common,
Oxfordshire
RG4 9RY
</pre>
<blockquote type="cite">
<pre wrap="">On 25 Nov 2014, at 20:00, <a class="moz-txt-link-abbreviated" href="mailto:grass-user-request@lists.osgeo.org">grass-user-request@lists.osgeo.org</a> wrote:
Send grass-user mailing list submissions to
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To subscribe or unsubscribe via the World Wide Web, visit
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of grass-user digest..."
Today's Topics:
1. Re: Computing major and minor axes for polygons (Benjamin Ducke)
2. Re: Computing major and minor axes for polygons (S?ren Gebbert)
3. Re: Computing major and minor axes for polygons (Nikos
Alexandris)
----------------------------------------------------------------------
Message: 1
Date: Mon, 24 Nov 2014 22:50:46 +0100
From: Benjamin Ducke <a class="moz-txt-link-rfc2396E" href="mailto:benducke@fastmail.fm"><benducke@fastmail.fm></a>
To: grass-user <a class="moz-txt-link-rfc2396E" href="mailto:grass-user@lists.osgeo.org"><grass-user@lists.osgeo.org></a>
Subject: Re: [GRASS-user] Computing major and minor axes for polygons
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:5473A836.5030305@fastmail.fm"><5473A836.5030305@fastmail.fm></a>
Content-Type: text/plain; charset=utf-8
Right, a PCA of the polygon vertices, I assume?
Maybe "v.to.db" could be enhanced to allow it to upload
the lengths of the first two/three components to the
attribute table?
For a quick fix, I solved the problem in a shell script using
a crude approximation. FWIW:
0. Set major axis length=-1
1. Rotate polygon by 10? (v.transform)
2. Fit region to polygon (g.region vect=).
3. Get width of region. If it is greater than major axis length,
set "major axis length = width"
4. Repeat from 1, until polygon has been rotated 350?
5. Minor axis length = height of current region.
Like I said, it's just a crude approximation (precision can
be increased by using smaller rotation steps) and slow, too.
But it's good enough for my purposes, which is basically to
calculate "elongation=len(major)/len(min)".
Best,
Ben
On 24/11/14 19:27, S?ren Gebbert wrote:
</pre>
<blockquote type="cite">
<pre wrap="">IIRC is the code to compute the major and minor axes already in GRASS.
You need to perform a Karhunen-Loewe-Transformation for each Polygon.
This is also known as principal components analysis.
Best regards
Soeren
Am 21.11.2014 23:33 schrieb "Benjamin Ducke" <<a class="moz-txt-link-abbreviated" href="mailto:benducke@fastmail.fm">benducke@fastmail.fm</a>
<a class="moz-txt-link-rfc2396E" href="mailto:benducke@fastmail.fm"><mailto:benducke@fastmail.fm></a>>:
Hi All --
Does anybody here know of an existing GRASS modules that
will compute the major and minor axes for the polygons of
a vector map?
Thanks and best,
Ben
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</pre>
</blockquote>
<pre wrap="">
--
Dr. Benjamin Ducke
{*} Geospatial Consultant
{*} GIS Developer
Spatial technology for the masses, not the classes:
experience free and open source GIS at <a class="moz-txt-link-freetext" href="http://gvsigce.org">http://gvsigce.org</a>
------------------------------
Message: 2
Date: Mon, 24 Nov 2014 23:44:29 +0100
From: S?ren Gebbert <a class="moz-txt-link-rfc2396E" href="mailto:soerengebbert@googlemail.com"><soerengebbert@googlemail.com></a>
To: Benjamin Ducke <a class="moz-txt-link-rfc2396E" href="mailto:benducke@fastmail.fm"><benducke@fastmail.fm></a>
Cc: grass-user <a class="moz-txt-link-rfc2396E" href="mailto:grass-user@lists.osgeo.org"><grass-user@lists.osgeo.org></a>
Subject: Re: [GRASS-user] Computing major and minor axes for polygons
Message-ID:
<a class="moz-txt-link-rfc2396E" href="mailto:CAPHDReJy+aLKPEZThfCd+8M935qGiLD1f-yNhrjemZ-s8RUmog@mail.gmail.com"><CAPHDReJy+aLKPEZThfCd+8M935qGiLD1f-yNhrjemZ-s8RUmog@mail.gmail.com></a>
Content-Type: text/plain; charset=UTF-8
Hi Ben,
2014-11-24 22:50 GMT+01:00 Benjamin Ducke <a class="moz-txt-link-rfc2396E" href="mailto:benducke@fastmail.fm"><benducke@fastmail.fm></a>:
</pre>
<blockquote type="cite">
<pre wrap="">Right, a PCA of the polygon vertices, I assume?
</pre>
</blockquote>
<pre wrap="">Exactly, create a covariance matrix from the vertices coordinates of
each polygon
and compute the eigenvectors and eigenvalues of these matrices.
Best regards
Soeren
</pre>
<blockquote type="cite">
<pre wrap="">Maybe "v.to.db" could be enhanced to allow it to upload
the lengths of the first two/three components to the
attribute table?
For a quick fix, I solved the problem in a shell script using
a crude approximation. FWIW:
0. Set major axis length=-1
1. Rotate polygon by 10? (v.transform)
2. Fit region to polygon (g.region vect=).
3. Get width of region. If it is greater than major axis length,
set "major axis length = width"
4. Repeat from 1, until polygon has been rotated 350?
5. Minor axis length = height of current region.
Like I said, it's just a crude approximation (precision can
be increased by using smaller rotation steps) and slow, too.
But it's good enough for my purposes, which is basically to
calculate "elongation=len(major)/len(min)".
Best,
Ben
On 24/11/14 19:27, S?ren Gebbert wrote:
</pre>
<blockquote type="cite">
<pre wrap="">IIRC is the code to compute the major and minor axes already in
GRASS.
You need to perform a Karhunen-Loewe-Transformation for each Polygon.
This is also known as principal components analysis.
Best regards
Soeren
Am 21.11.2014 23:33 schrieb "Benjamin Ducke" <<a class="moz-txt-link-abbreviated" href="mailto:benducke@fastmail.fm">benducke@fastmail.fm</a>
<a class="moz-txt-link-rfc2396E" href="mailto:benducke@fastmail.fm"><mailto:benducke@fastmail.fm></a>>:
Hi All --
Does anybody here know of an existing GRASS modules that
will compute the major and minor axes for the polygons of
a vector map?
Thanks and best,
Ben
_______________________________________________
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<a class="moz-txt-link-abbreviated" href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a> <a class="moz-txt-link-rfc2396E" href="mailto:grass-user@lists.osgeo.org"><mailto:grass-user@lists.osgeo.org></a>
<a class="moz-txt-link-freetext" href="http://lists.osgeo.org/mailman/listinfo/grass-user">http://lists.osgeo.org/mailman/listinfo/grass-user</a>
</pre>
</blockquote>
<pre wrap="">
--
Dr. Benjamin Ducke
{*} Geospatial Consultant
{*} GIS Developer
Spatial technology for the masses, not the classes:
experience free and open source GIS at <a class="moz-txt-link-freetext" href="http://gvsigce.org">http://gvsigce.org</a>
_______________________________________________
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<a class="moz-txt-link-abbreviated" href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a>
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</pre>
</blockquote>
<pre wrap="">
------------------------------
Message: 3
Date: Tue, 25 Nov 2014 19:10:38 +0200
From: Nikos Alexandris <a class="moz-txt-link-rfc2396E" href="mailto:nik@nikosalexandris.net"><nik@nikosalexandris.net></a>
To: <a class="moz-txt-link-rfc2396E" href="mailto:grass-user@lists.osgeo.org"><grass-user@lists.osgeo.org></a>
Subject: Re: [GRASS-user] Computing major and minor axes for polygons
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:5db8e3e250d0adde57c6a9628ba5611f@nikosalexandris.net"><5db8e3e250d0adde57c6a9628ba5611f@nikosalexandris.net></a>
Content-Type: text/plain; charset=UTF-8; format=flowed
On 24.11.2014 23:50, Benjamin Ducke wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Right, a PCA of the polygon vertices, I assume?
Maybe "v.to.db" could be enhanced to allow it to upload
the lengths of the first two/three components to the
attribute table?
For a quick fix, I solved the problem in a shell script using
a crude approximation. FWIW:
0. Set major axis length=-1
1. Rotate polygon by 10? (v.transform)
2. Fit region to polygon (g.region vect=).
3. Get width of region. If it is greater than major axis length,
set "major axis length = width"
4. Repeat from 1, until polygon has been rotated 350?
5. Minor axis length = height of current region.
</pre>
</blockquote>
<pre wrap="">Wow, What a smart approach! :-)
Nikos
------------------------------
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End of grass-user Digest, Vol 103, Issue 42
*******************************************
</pre>
</blockquote>
<pre wrap="">
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</pre>
</blockquote>
<pre wrap="">
</pre>
</blockquote>
<pre wrap="">
--
Angelos Tzotsos
Remote Sensing Laboratory
National Technical University of Athens
<a class="moz-txt-link-freetext" href="http://users.ntua.gr/tzotsos">http://users.ntua.gr/tzotsos</a>
------------------------------
Message: 2
Date: Sun, 30 Nov 2014 03:46:54 +0000
From: shashank khare <a class="moz-txt-link-rfc2396E" href="mailto:skhare@hotmail.com"><skhare@hotmail.com></a>
To: <a class="moz-txt-link-rfc2396E" href="mailto:grass-user@lists.osgeo.org">"grass-user@lists.osgeo.org"</a> <a class="moz-txt-link-rfc2396E" href="mailto:grass-user@lists.osgeo.org"><grass-user@lists.osgeo.org></a>
Subject: [GRASS-user] mapping interface
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:BLU175-W24E2D4661F9FD9E586BF7CC97C0@phx.gbl"><BLU175-W24E2D4661F9FD9E586BF7CC97C0@phx.gbl></a>
Content-Type: text/plain; charset="iso-8859-1"
I want to develop a mapping application using python for avalanche flow simulation which takes a lot of user inputs. I do not want to go through wxGUI as the user is not interested in options shown by its GUI. Is there any documentation about 2d/3d mapping interface classes/modules which I can use. If these are not documented I can help in it.
ThanksShash
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Message: 3
Date: Sun, 30 Nov 2014 04:13:43 +0000
From: C?sar Augusto Ram?rez Franco <a class="moz-txt-link-rfc2396E" href="mailto:caesarivs@gmail.com"><caesarivs@gmail.com></a>
To: GRASS User List <a class="moz-txt-link-rfc2396E" href="mailto:grass-user@lists.osgeo.org"><grass-user@lists.osgeo.org></a>
Subject: Re: [GRASS-user] how to change all cats in a vector line
Message-ID:
<a class="moz-txt-link-rfc2396E" href="mailto:CAJDYeikYbxrb3-w3ZSiiN3ufZoLzQRnQow+RjgD5=RZDs67XVw@mail.gmail.com"><CAJDYeikYbxrb3-w3ZSiiN3ufZoLzQRnQow+RjgD5=RZDs67XVw@mail.gmail.com></a>
Content-Type: text/plain; charset="utf-8"
Hello Michael
You could use r.stream.order after r.stream.extract to get your stream
network ordered, and then, after running r.thin on the ordered stream
network, convert it to vector using r.to.vect with the -v flag, that way,
each order is a cat, you can them use v.to.points or the add-on suggested
below to get topologically-correct points along the stream network, you
could also use r.stream.distance and upload distance and elevation to each
point using v.what.rast
I usually run R from within GRASS and use the spgrass6 library to read the
vector map and analyze the data there
Regards
C?sar.
El s?b, 29 de noviembre de 2014 06:29 p.m., Helmut Kudrnovsky <a class="moz-txt-link-rfc2396E" href="mailto:hellik@web.de"><hellik@web.de></a>
escribi?:
</pre>
<blockquote type="cite">
<pre wrap="">Michael Barton wrote
</pre>
<blockquote type="cite">
<pre wrap="">Hi Markus,
What I'm trying to do is start with a raster stream map from r.drain and
convert it to a sequence of vector points, where each point has
information as to its position along the stream. I then use the points
</pre>
</blockquote>
<pre wrap="">for
</pre>
<blockquote type="cite">
<pre wrap="">sampling a stream profile and related information. Oddly enough, with all
of the very useful stream analysis modules, there is nothing I could find
to generate the data for a stream profile (distance from outlet or from
headwaters vs. elevation).
v.to.points does a nice job of creating a sequence of evenly spaced
</pre>
</blockquote>
<pre wrap="">points
</pre>
<blockquote type="cite">
<pre wrap="">with information about their location along a line (the "along" field).
BUT, if the line is composed of multiple segments or even if it has an
irregularity in it, the "along" values start over again from 0. The only
way I can use it is if I have a very clean and continuous vector line
</pre>
</blockquote>
<pre wrap="">with
</pre>
<blockquote type="cite">
<pre wrap="">only a single cat.
This has proven surprisingly difficult to obtain reliably from my raster
stream map. So far, the only way has been to do a two sequences of
</pre>
</blockquote>
<pre wrap="">v.clean
</pre>
<blockquote type="cite">
<pre wrap="">(with thresholds 1.5 X the raster resolution) and v.build.polylines. If
you have any better suggestion, I'd love to hear it.
Thanks again for the polylines idea. That was a big help.
Michael
____________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity
Professor of Anthropology, School of Human Evolution & Social Change
Head, Graduate Faculty in Complex Adaptive Systems Science
Arizona State University
voice: 480-965-6262 (SHESC), 480-965-8130/727-9746 (CSDC)
fax: 480-965-7671 (SHESC), 480-727-0709 (CSDC)
www: <a class="moz-txt-link-freetext" href="http://www.public.asu.edu/~cmbarton">http://www.public.asu.edu/~cmbarton</a>, <a class="moz-txt-link-freetext" href="http://csdc.asu.edu">http://csdc.asu.edu</a>
</pre>
<blockquote type="cite">
<pre wrap="">On Nov 29, 2014, at 10:20 AM, Michael Barton <
</pre>
</blockquote>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">Michael.Barton@
</pre>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">
Thanks. This helped.
Michael
____________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity
Professor of Anthropology, School of Human Evolution & Social Change
Head, Graduate Faculty in Complex Adaptive Systems Science
Arizona State University
voice: 480-965-6262 (SHESC), 480-965-8130/727-9746 (CSDC)
fax: 480-965-7671 (SHESC), 480-727-0709 (CSDC)
www: <a class="moz-txt-link-freetext" href="http://www.public.asu.edu/~cmbarton">http://www.public.asu.edu/~cmbarton</a>, <a class="moz-txt-link-freetext" href="http://csdc.asu.edu">http://csdc.asu.edu</a>
</pre>
<blockquote type="cite">
<pre wrap="">On Nov 29, 2014, at 1:23 AM, Markus Neteler <
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">neteler@
</pre>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">> wrote:
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">
On Sat, Nov 29, 2014 at 6:16 AM, Michael Barton <
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">Michael.Barton@
</pre>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">> wrote:
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">I have a vector line that is divided into 12 cat values. I?d like all
of the
line to have a single cat value. I?ve tried v.category to no avail. If
I
delete all categories and then add new categories, I get 12 cats
</pre>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">again.
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
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<pre wrap="">And
I can find no other way to get a single cat for the entire line.
Hopefully
someone can tell what I?m missing here.
</pre>
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<pre wrap="">
Please try to use
<a class="moz-txt-link-freetext" href="http://grass.osgeo.org/grass70/manuals/v.build.polylines.html">http://grass.osgeo.org/grass70/manuals/v.build.polylines.html</a>
Markus
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<pre wrap="">
<a class="moz-txt-link-freetext" href="http://grass.osgeo.org/grass71/manuals/r.stream.extract.html">http://grass.osgeo.org/grass71/manuals/r.stream.extract.html</a> ?
-----
best regards
Helmut
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Message: 4
Date: Sun, 30 Nov 2014 04:51:04 +0000
From: Michael Barton <a class="moz-txt-link-rfc2396E" href="mailto:Michael.Barton@asu.edu"><Michael.Barton@asu.edu></a>
To: grass-user grass-user <a class="moz-txt-link-rfc2396E" href="mailto:grass-user@lists.osgeo.org"><grass-user@lists.osgeo.org></a>
Subject: Re: [GRASS-user] grass-user Digest, Vol 103, Issue 47
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:D877804B-CAF8-4178-9156-6D2F160CA3C0@asu.edu"><D877804B-CAF8-4178-9156-6D2F160CA3C0@asu.edu></a>
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r.stream.extract can make the raster streams?ones that are pretty much equivalent to those made with r.watershed. But it can?t do stream profiles AFAICT. Also, like r.watershed, it extracts a stream network, not a particular stream. That is why we?re using r.drain to extract a particular drainage.
MICHAEL
____________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity
Professor of Anthropology, School of Human Evolution & Social Change
Head, Graduate Faculty in Complex Adaptive Systems Science
Arizona State University
voice: 480-965-6262 (SHESC), 480-965-8130/727-9746 (CSDC)
fax: 480-965-7671 (SHESC), 480-727-0709 (CSDC)
www: <a class="moz-txt-link-freetext" href="http://www.public.asu.edu/~cmbarton">http://www.public.asu.edu/~cmbarton</a>, <a class="moz-txt-link-freetext" href="http://csdc.asu.edu">http://csdc.asu.edu</a>
On Nov 29, 2014, at 4:40 PM, <a class="moz-txt-link-abbreviated" href="mailto:grass-user-request@lists.osgeo.org">grass-user-request@lists.osgeo.org</a><a class="moz-txt-link-rfc2396E" href="mailto:grass-user-request@lists.osgeo.org"><mailto:grass-user-request@lists.osgeo.org></a> wrote:
Re: [GRASS-user] how to change all cats in a vector line
Michael Barton wrote
Hi Markus,
What I'm trying to do is start with a raster stream map from r.drain and
convert it to a sequence of vector points, where each point has
information as to its position along the stream. I then use the points for
sampling a stream profile and related information. Oddly enough, with all
of the very useful stream analysis modules, there is nothing I could find
to generate the data for a stream profile (distance from outlet or from
headwaters vs. elevation).
v.to.points does a nice job of creating a sequence of evenly spaced points
with information about their location along a line (the "along" field).
BUT, if the line is composed of multiple segments or even if it has an
irregularity in it, the "along" values start over again from 0. The only
way I can use it is if I have a very clean and continuous vector line with
only a single cat.
This has proven surprisingly difficult to obtain reliably from my raster
stream map. So far, the only way has been to do a two sequences of v.clean
(with thresholds 1.5 X the raster resolution) and v.build.polylines. If
you have any better suggestion, I'd love to hear it.
Thanks again for the polylines idea. That was a big help.
Michael
____________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity
Professor of Anthropology, School of Human Evolution & Social Change
Head, Graduate Faculty in Complex Adaptive Systems Science
Arizona State University
voice: 480-965-6262 (SHESC), 480-965-8130/727-9746 (CSDC)
fax: 480-965-7671 (SHESC), 480-727-0709 (CSDC)
www: <a class="moz-txt-link-freetext" href="http://www.public.asu.edu/~cmbarton">http://www.public.asu.edu/~cmbarton</a>, <a class="moz-txt-link-freetext" href="http://csdc.asu.edu">http://csdc.asu.edu</a><a class="moz-txt-link-rfc2396E" href="http://csdc.asu.edu/"><http://csdc.asu.edu/></a>
On Nov 29, 2014, at 10:20 AM, Michael Barton <
Michael.Barton@
> wrote:
Thanks. This helped.
Michael
____________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity
Professor of Anthropology, School of Human Evolution & Social Change
Head, Graduate Faculty in Complex Adaptive Systems Science
Arizona State University
voice: 480-965-6262 (SHESC), 480-965-8130/727-9746 (CSDC)
fax: 480-965-7671 (SHESC), 480-727-0709 (CSDC)
www: <a class="moz-txt-link-freetext" href="http://www.public.asu.edu/~cmbarton">http://www.public.asu.edu/~cmbarton</a>, <a class="moz-txt-link-freetext" href="http://csdc.asu.edu">http://csdc.asu.edu</a><a class="moz-txt-link-rfc2396E" href="http://csdc.asu.edu/"><http://csdc.asu.edu/></a>
On Nov 29, 2014, at 1:23 AM, Markus Neteler <
neteler@
> wrote:
On Sat, Nov 29, 2014 at 6:16 AM, Michael Barton <
Michael.Barton@
> wrote:
I have a vector line that is divided into 12 cat values. I?d like all
of the
line to have a single cat value. I?ve tried v.category to no avail. If
I
delete all categories and then add new categories, I get 12 cats again.
And
I can find no other way to get a single cat for the entire line.
Hopefully
someone can tell what I?m missing here.
Please try to use
<a class="moz-txt-link-freetext" href="http://grass.osgeo.org/grass70/manuals/v.build.polylines.html">http://grass.osgeo.org/grass70/manuals/v.build.polylines.html</a>
Markus
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-----
best regards
Helmut
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<pre class="moz-signature" cols="72">--
Angelos Tzotsos
Remote Sensing Laboratory
National Technical University of Athens
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