[GRASS-user] r.convergence vs TCI (r.terraflow). Difference?
Rengifo Ortega
rengifoo at yahoo.de
Sun Apr 3 12:41:08 PDT 2016
Hei Helmut,thanks for your quick response.Best regardsRengifo
Von: "grass-user-request at lists.osgeo.org" <grass-user-request at lists.osgeo.org>
An: grass-user at lists.osgeo.org
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Today's Topics:
1. r.convergence vs TCI (r.terraflow). Difference? (Rengifo Ortega)
2. Re: r.convergence vs TCI (r.terraflow). Difference?
(Helmut Kudrnovsky)
3. Summers schools in Geo-Data Processing (Giuseppe Amatulli)
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Message: 1
Date: Thu, 31 Mar 2016 19:04:48 +0000 (UTC)
From: Rengifo Ortega <rengifoo at yahoo.de>
To: "grass-user at lists.osgeo.org" <grass-user at lists.osgeo.org>
Subject: [GRASS-user] r.convergence vs TCI (r.terraflow). Difference?
Message-ID:
<305482744.937965.1459451088768.JavaMail.yahoo at mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"
Dear community,Can someone explain me the difference between r.convergence and the TCI calculated by r.terraflow.Best regardsRengifo Ortega
Von: "grass-user-request at lists.osgeo.org" <grass-user-request at lists.osgeo.org>
An: grass-user at lists.osgeo.org
Gesendet: 21:00 Donnerstag, 31.März 2016
Betreff: grass-user Digest, Vol 119, Issue 61
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Today's Topics:
1. Output of i.segment (Jaya Krishnan)
2. problem with g.proj.exe (Giuliano Urgeghe)
3. Re: v.rast.stats with mode? (patrick s.)
4. problem with g.proj.exe (Giuliano Urgeghe)
5. Re: problem with g.proj.exe (Martin Landa)
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Message: 1
Date: Wed, 30 Mar 2016 16:17:34 -0700
From: Jaya Krishnan <jayaakrish at gmail.com>
To: grass-user at lists.osgeo.org
Subject: [GRASS-user] Output of i.segment
Message-ID:
<CAJmi+1C-3FiuBbxTMDtKrr0kBD60gkKmZT9+1WvpYqtEkqJnkw at mail.gmail.com>
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Hi fellow GRASS users,
I have outputs of i.segment (object segmentation) for 30m Landsat imagery
from 4 dates. The segments are around 10000 each for each imagery. How can
I use these outputs for land cover change analysis? Do I have to vectorize
these and recode the classes, or is there a more efficient way?
Thanks!
Jaya
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Message: 2
Date: Thu, 31 Mar 2016 01:43:25 +0200
From: Giuliano Urgeghe <giuliano.u at gmail.com>
To: GRASS user list <grass-user at lists.osgeo.org>
Subject: [GRASS-user] problem with g.proj.exe
Message-ID:
<CABQtJmQa9d6ExUN0muCefz-A7NgkeU2cfRMq10vtpMXZj+DJyg at mail.gmail.com>
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Hi all,
today, I have a problem with my release "grass 6.4.4 with my sis " in
windows vista.
When I open my mapset, appears this error:
"g.proj.exe ha smesso di funzionare".
Someone has an idea for a solution.
thanks in advance.
Giuliano
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Message: 3
Date: Thu, 31 Mar 2016 10:32:17 +0200
From: "patrick s." <patrick_gis at gmx.net>
To: Anna Petrášová <kratochanna at gmail.com>
Cc: GRASS user list <grass-user at lists.osgeo.org>
Subject: Re: [GRASS-user] v.rast.stats with mode?
Message-ID: <56FCE091.2010203 at gmx.net>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Following Anna's suggestion I had to find out that r.mode has to option
to handle NULL values, i.e. exclude it from calculation? I need to
aggregate rasters to polygons, with rasters covering only a small part
of the polygon. As I realized now r.mode returns NULL in such case.
Setting NULL with r.null null=9999 it will return 9999 for all of these.
Is there a solution to that problem?
Patrick
On 16.03.2016 13:59, Anna Petrášová wrote:
>
>
> On Wed, Mar 16, 2016 at 6:23 AM, patrick s. <patrick_gis at gmx.net
> <mailto:patrick_gis at gmx.net>> wrote:
>
> Dear list
>
> Is it possible to get the "mode" (most common occurring value) in
> a polygon for discrete classes? It appears that v.rast.stats does
> not have this option.
>
>
> v.rast.stats uses r.univar and r.univar doesn't have mode implemented
> (it's a TODO in manual). You can look at r.mode but it returns raster
> map, not one number.
>
> Anna
>
>
> Thanks for a short feedback,
> Patrick
>
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org <mailto:grass-user at lists.osgeo.org>
> http://lists.osgeo.org/mailman/listinfo/grass-user
>
>
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Message: 4
Date: Thu, 31 Mar 2016 15:36:38 +0200
From: Giuliano Urgeghe <giuliano.u at gmail.com>
To: GRASS user list <grass-user at lists.osgeo.org>
Subject: [GRASS-user] problem with g.proj.exe
Message-ID:
<CABQtJmRDj6bHEe34CpkwRuRmvx5Pqm8gf3P-8U59SFKwvdJBaw at mail.gmail.com>
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this ticket helped me!
has been fixed very well!
THANKS
https://trac.osgeo.org/grass/ticket/827
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Message: 5
Date: Thu, 31 Mar 2016 15:38:26 +0200
From: Martin Landa <landa.martin at gmail.com>
To: Giuliano Urgeghe <giuliano.u at gmail.com>
Cc: GRASS user list <grass-user at lists.osgeo.org>
Subject: Re: [GRASS-user] problem with g.proj.exe
Message-ID:
<CA+Ei1Oen8xEtdTqktrfGmiP_S811K=8EOd79yEzBR74iGvZG3g at mail.gmail.com>
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Hi,
2016-03-31 15:36 GMT+02:00 Giuliano Urgeghe <giuliano.u at gmail.com>:
>
> this ticket helped me!
>
> has been fixed very well!
>
> THANKS
>
> https://trac.osgeo.org/grass/ticket/827
please consider to update your GRASS to version 7. Martin
--
Martin Landa
http://geo.fsv.cvut.cz/gwiki/Landa
http://gismentors.cz/mentors/landa
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Message: 2
Date: Fri, 1 Apr 2016 01:12:03 -0700 (PDT)
From: Helmut Kudrnovsky <hellik at web.de>
To: grass-user at lists.osgeo.org
Subject: Re: [GRASS-user] r.convergence vs TCI (r.terraflow).
Difference?
Message-ID: <1459498323040-5259102.post at n6.nabble.com>
Content-Type: text/plain; charset=us-ascii
>Dear community,
>Can someone explain me the difference between r.convergence and the TCI
calculated by r.terraflow.
from the manuals:
https://grass.osgeo.org/grass71/manuals/r.terraflow.html
r.terraflow also computes the tci raster (topographic convergence index,
defined as the logarithm of the ratio of flow accumulation and local slope).
https://grass.osgeo.org/grass70/manuals/addons/r.convergence.html
Convergence index is a terrain parameter which show the structure od the
relief as a set of convergent areas (channels) and divergent areas (ridges).
AFAIU r.convergence calculates kind of geomorphological items (convergent
areas (channels) and divergent areas (ridges)); r.terraflow's tci indicates
terrain derivatives (ratio of flow accumulation and local slope).
-----
best regards
Helmut
--
View this message in context: http://osgeo-org.1560.x6.nabble.com/r-convergence-vs-TCI-r-terraflow-Difference-tp5259043p5259102.html
Sent from the Grass - Users mailing list archive at Nabble.com.
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Message: 3
Date: Fri, 1 Apr 2016 13:00:16 -0400
From: Giuseppe Amatulli <giuseppe.amatulli at gmail.com>
To: gdal-dev at lists.osgeo.org, grass-user at lists.osgeo.org,
grass-stats at lists.osgeo.org, qgis-user at lists.osgeo.org, R-SIG list
<r-sig-geo at r-project.org>
Cc: Stefano Casalegno <stefano at casalegno.net>,
info at spatial-ecology.net
Subject: [GRASS-user] Summers schools in Geo-Data Processing
Message-ID:
<CAKoiDH+XDg8sU_UkZacMDaHkxTM_Vn3p+y9NCtk7bUVt1oVe_A at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Apologies for cross-posting:
We are pleased to announce: *R**egistration open now for two Summer Schools*
organized by www.spatial-ecology.net held at the University of Basilicata,
Matera, Italy:
*- Spatio-Temporal Data Analyses Using Free and Open Source Software
**(6th-10th
June 2016)*
*An immersion 5 day experience opening new horizons on the use of the vast
potentials of the Linux environment and the command line approach to
process data using Bash, AWK, Python, GRASS, QGIS, GDAL/OGR, R, PKtools,
Openforis. **We will guide newbies who have never used a command line
terminal to a stage which will allow them to understand and use very
advanced open source data processing routines. Our focus is to enhance the
approach of self-learning allowing participants to keep on progressing and
updating their skills in a continuously evolving technological environment.*
*----------------------------------------------------*
*- Hands-on Open Source Drone Mapping and High Performance Computing for
Big Geo-Data **(13th-17th June 2016)*
*Another 5 day immersion experience on advanced data processing using high
performance computers (HPC) and emerging technologies such as drone
mapping, rasdaman (Fastest Array Database on Earth) and cloud computing. We
provide a walk-through journey from the introduction of Linux operating
system and different open source software (Python, GRASS, GDAL/OGR, R,
PKtools, Openforis) to capturing data out in the field using an Unmanned
Aerial Vehicle, to complex image processing and data analyses. We focus on
how maximising computation performance using multicore on single computer,
switching to distributed clusters of computers (using grid engine
scheduler) and ultimately data analytics with cutting edge rasdaman
software (Big Data Analytics Server).*
More information and registrations:
www.spatial-ecology.net/upcoming-events
https://www.facebook.com/spatialecology
<http://www.spatial-ecology.net/upcoming-events>> see events
info at spatial-ecology.net
--
Giuseppe Amatulli, Ph.D.
Department of Ecology and Evolutionary Biology, Yale University.
Jetz Lab, OML Room 405
P.O. Box 208106
165 PROSPECT ST
New Haven, CT 06520-8106
Teaching: spatial-ecology.net
Work: http://sbsc.yale.edu/giuseppe-amatulli
<http://www.spatial-ecology.net>
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