from a practical standpoint, it looks like in your image the origin point for
the isolines is central Paris, not the yellow dot to north.
By way of comparison with your image, what do results look like if you use
v.net.iso? This will return lines with each ISO cost value, not a surface. It
that underlie each method.
Sing out if you want to test your methodology on me. Just email me..
- mark
Sent from my iPhone
On 4 Mar 2015, at 7:48 am, Mark Wynter m...@dimensionaledge.com wrote:
Hi Daniel,
I've done something similar - I call it off road routing, and uses a
regular
Hi Daniel
The modeling approach I took used a combination of grass and postgis.
I ran v.net.iso for every processing plant - or possible processing plant - and
every farm centroid.
At this point, I did not worry about capacity limitations of the plants - you
can assume each is unconstrained.
Hi Daniel,
I've done something similar - I call it off road routing, and uses a regular
lattice of nodes and arcs. You can then constrain the off road network by
closing arcs that cross major watercourses, fence lines or where the terrain or
vegetation is non navigatable. For farms, I added
Hi Moritz, Stefan (and Marcus if you’re around?)
Every day is a new day.
Not IOPs, Not memory, Not CPU… Hmm, how about reboot...
As you have suspected, I get no benefit from additional CPUs.
Are you sure the problem is CPU-bound ?
I started by testing v.net (the maintenance module) in
with v.net? Anyone?
Mark
On 13 Feb 2015, at 7:56 pm, Moritz Lennert mlenn...@club.worldonline.be wrote:
On 13/02/15 08:39, Mark Wynter wrote:
I’ve encountered a bottleneck somewhere with v.net http://v.net when
scaling out with GNU Parallel… not sure if its an underlying issue with
v.net
Getting closer to the bottom of this.
On AWS, problems occur once I scale beyond 16 CPUs.
c3.4xlarge (16 CPUs, 30GB memory), v.net scales linearly
c3.8xlarge (32 CPUs, 60GB memory), v.net doesn't scale AT ALL - the same as
having single CPU.
I don’t believe its a pg issue, as I run loads of
):~ db.connect -p
driver: sqlite
database: /var/tmp/test/PERMANENT/sqlite/sqlite.db
schema:
group:
On 12 Feb 2015, at 7:05 pm, Moritz Lennert mlenn...@club.worldonline.be wrote:
On 12/02/15 02:14, Mark Wynter wrote:
#(2) RESET THE DATABASE DRIVER FOR THE CURRENT MAPSET TO SQLITE
db.connect
Thanks Moritz - good suggestion - I just need to these as deliverables out to
2 separate clients (nice to get paid work for this stuff) - then I will write
up and contribute back via Wiki.
The slow rate of writing out the v.net.allpair results from
PostgreSQL was due to the sheer volume of
I’ve encountered a bottleneck somewhere with v.net when scaling out with GNU
Parallel… not sure if its an underlying issue with v.net or the way I’m calling
the batch jobs?
I’ve got 32 CPUs and commensurate RAM. What I’m observing is v.net CPU
utilisation dropping off in accordance with
Haven’t come across anything to that effect
Can you set schema='' or something like that ?
Moritz
I’ve reverted back to using solely PG driver - notwithstanding this SQLite
issue.
As a prologue to the several issues I encountered with Grass over the last few
days…
The slow rate of
Within the same mapset, is it possible to specify SQLITE as the database for
the output layer, whilst using a map as an input that has a PG driver?
I’ve read the manual and tried a few approaches, but I found the outputs still
get written to PG. May be I’ve missed a critical step? See
grass
ERROR: Unable to create table: 'create table grass.temp_8_1 ( cat integer,
from_cat integer, to_cat integer, cost double precision)'
Segmentation fault
On 12/02/15 00:12, Mark Wynter wrote:
Within the same mapset, is it possible to specify SQLITE as the database
for the output
As context, I’m running analysis using v.net.allpairs, whereby vector
geometries are often common to more than 1 origin-destination journey path,
hence the line segments appear multiple times but with unique cat values, and
from_cat and to_cat combinations.
When exporting the output layer of
Hi list
Context is I’m running v.net.allpairs over a large road network - the output is
all combination origin - destination pairs, and the individual line segments
that make up a journey path. Individual line segments will appear more than
once where they’re common to more than 1 journey
Thanks Marcus - am I right in understanding that read and write resulted in the
db being opened twice? Was this confined to just v.patch? Anything a user
needs to do differently, apart from update?
___
grass-user mailing list
feature - thanks Martin Landa!!!
--
Message: 1
Date: Mon, 19 Jan 2015 00:53:58 +1030
From: Mark Wynter m...@dimensionaledge.com
To: grass grass-user@lists.osgeo.org
Subject: [GRASS-user] SQLITE db locking problem
Message-ID
Hi everyone
I’m having issues with SQLITE as the db driver - I encounter this BUSY warning.
Only occurs when patching a particular map, in this case “temp_nbt_cleaned
which is the largest of the datasets being patched. If I work with smaller
datasets, it works fine. Pre-patching, SQLITE DB
Hi Daniel - not sure why you’re getting that error - I’ll leave that to someone
more familiar with the backend workings to comment on.
In the interests of you moving forward, one approach might be that you simply
manually add nodes in say QGIS before running v.snap.
By that, I mean:
1) In
Re-checked out SVN
Clean install directory
Installed without a hitch :-)
___
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user
Upon running ‘make’, I get errors consistent with the message below.
Any clues as to the source of the Error 1 messages, and what the fix is?
Thanks
Mark
#
make -C v.centroids || echo
/home/grass/grass70/releasebranch_7_0/scripts/v.centroids
/home/grass/grass70/releasebranch_7_0/error.log
Curious to hear if anyone has considered or is considering v.net in a high
performance computing environment?
- Mark
___
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user
Thanks Markus for the explanation. I've set PostGIS as my backend. Will
revert as I get more into v.net
On 22/04/2013, at 8:20 PM, Markus Metz wrote:
On Mon, Apr 22, 2013 at 11:03 AM, Mark Wynter m...@dimensionaledge.com
wrote:
Thanks Marcus.
Tried sqlite backend suggestion
Do you have fresh installation from svn?
Thanks Martin. Good advice - I just pulled the latest from svn!
v.out.postgis now works, generating correct feature count and SRID=2193
yet... v.out.ogr when writing directly to PostGIS assigns SRID 900915 to the
geometry column - when it should be
v.out.ogr in=roadsmajor dsn=PG:dbname=pgis_grass format=PostgreSQL
-
$ db.select data=pgis_grass dri=pg sql=select count(*) from roadsmajor -c
355
db.select data=pgis_grass dri=pg sql=select srid from
geometry_columns where f_table_name = 'roadsmajor' -c
900914
(new srid added to
Thanks Marcus.
Tried sqlite backend suggestion - no improvement - then read that that sqlite
is the default backend for grass7.
I suspect the complexity of the input dataset may be the contributing factor.
For example, I ran v.clean over the already cleaned OSM dataset (2.6M lines),
and it
Hi All, we're looking for ways to speed up the cleaning of a large OSM road
network (relating to Australia). We're running on a large Amazon AWS EC2
instance.
What we've observed is exponential growth in time taken as number of
linestrings increases.
This means it's taking about 3 days to
of boundaries: 0
Number of centroids: 0
Number of areas: 0
Number of isles: 0
On 19/04/2013, at 6:07 PM, Markus Metz wrote:
On Fri, Apr 19, 2013 at 9:06 AM, Mark Wynter m...@dimensionaledge.com wrote:
Hi All, we're looking for ways to speed up the cleaning of a large OSM road
network (relating
Thanks Andrew
I suggest running a test script that reports sys.path to confirm that the
actual Python module search path seen by the Postgres server's environment is
as expected.
From the python console, logged in as posgres user
postgres@ip-10-252-74-140:/home/ubuntu$ python -c
My requirement is to connect to GRASS from PostgreSQL9.1/PostGIS2.0 via the
pg-python or plpythonu procedural language. I'm wondering whether I have a
permissions issue?
I'm running my stack on Ubuntu 12.04 LTS
I've added the following environmental variables to /etc/bash.bashrc
export
30 matches
Mail list logo
