[GRASS-user] Problems with r.viewshed
Markus Neteler
neteler at osgeo.org
Fri Sep 26 04:07:36 PDT 2014
On Sep 26, 2014 12:37 PM, "Luis Miguel Royo Pérez" <
luis.miguel.royo at gmail.com> wrote:
>
> Thank you very much. That was the problem.
Please suggest how to improve the module help text or manual.
Thanks
Markus
> Sorry for any inconvenience.
>
> Kind regards.
>
>
> El 26/09/14 a las #4, Pedro Palheiro escribió:
>>
>> Hello Luis,
>>
>> Maybe it is a coordinate reference system problem? It looks like you're
using wgs84 for the input and coordinates, and requesting the calculation
in meters (obs_elev, tgt_elev and max_dist). Try to change the CRS to see
if it works.
>>
>> r.viewshed -b input=Portada at inisig output=visPort
>> coordinates=-3.74034324324,42.5352702703
>> obs_elev=9 tgt_elev=1.75
>> max_dist=30000
>> Computing events...
>> Computing visibility...
>> r.viewshed: statusstructure.cpp:73: float
>> get_vertical_angle(Viewpoint, StatusNode, surface_type,
>> int): La declaraci?n `fabs(sn.dist2vp) > 0.001' no se
>> cumple.
>>
>> Adios,
>> Pedro Palheiro
>>
>>
>> 2014-09-25 20:00 GMT+01:00 <grass-user-request at lists.osgeo.org>:
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>>> Today's Topics:
>>>
>>> 1. Re: removing small lines (Markus Neteler)
>>> 2. Problems with r.viewshed (Luis Miguel Royo P?rez)
>>> 3. Re: Problems with r.viewshed (Markus Neteler)
>>> 4. Re: Problems with r.viewshed (Luis Miguel Royo P?rez)
>>>
>>>
>>> ----------------------------------------------------------------------
>>>
>>> Message: 1
>>> Date: Thu, 25 Sep 2014 10:25:25 +0200
>>> From: Markus Neteler <neteler at osgeo.org>
>>> To: Levente Juh?sz <jlevente89 at gmail.com>
>>> Cc: GRASS user list <grass-user at lists.osgeo.org>
>>> Subject: Re: [GRASS-user] removing small lines
>>> Message-ID:
>>> <CALFmHhsJtJ0-=
me+C_8o6+Y9CTA1P-cofD3NemuyE30uBmvF5Q at mail.gmail.com>
>>> Content-Type: text/plain; charset=UTF-8
>>>
>>> On Wed, Sep 24, 2014 at 4:22 PM, Levente Juh?sz <jlevente89 at gmail.com>
wrote:
>>> > Hi all,
>>> >
>>> > I've seen that the remove_small method of v.generalize has been
eliminated.
>>> > Reduction method does not work in the way I want since it just
removes point
>>> > from lines and it seems like has no effect on a line of 2 points -
even if
>>> > they're smaller than the threshold.
>>> > Can someone tell me what the workaround is for removing small lines
from a
>>> > vector for example by a threshold in map units?
>>>
>>>
>>> You may use v.to.db and option=length (line length), then use
>>> v.extract to extract into a new map according to a threshold you need.
>>>
>>> Markus
>>>
>>>
>>> ------------------------------
>>>
>>> Message: 2
>>> Date: Thu, 25 Sep 2014 10:35:52 +0200
>>> From: Luis Miguel Royo P?rez <
>>>
>>> luis.miguel.royo at gmail.com>
>>> To: grass-user at lists.osgeo.org
>>> Subject: [GRASS-user] Problems with r.viewshed
>>> Message-ID: <5423D3E8.5090206 at gmail.com>
>>> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>>>
>>> Hi everyone,
>>>
>>> when I try to run r.viewshed the output shows me this:
>>>
>>> Nodata value set to -nan
>>> rows=198, cols=217, total = 42966
>>> In-memory memory usage is 4298336 B (4 MB), max mem
>>> allowed=524288000 B(500MB)
>>> ***** IN_MEMORY MODE *****
>>> Start sweeping.
>>> Computing events ...
>>> Sorting events...
>>> Terminado.
>>> Determine visibility...
>>> r.viewshed: statusstructure.cpp:73: float
>>> get_vertical_angle(Viewpoint, StatusNode, surface_type,
>>> int): La declaraci?n `fabs(sn.dist2vp) > 0.001' no se
>>> cumple.
>>>
>>> Anyone has a clue about what it could be happening?
>>>
>>> I'm using GRASS 6.4.4 in Xubuntu 14.04.
>>>
>>> I think I must say that a few days ago I installed GRASS 7 but I removed
>>> it and reinstalled GRASS 6.4.4. Maybe is there any incompatibility?
>>>
>>>
>>> Thanks a lot!!!
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>>> ------------------------------
>>>
>>> Message: 3
>>> Date: Thu, 25 Sep 2014 12:46:13 +0200
>>> From: Markus Neteler <neteler at osgeo.org>
>>> To: Luis Miguel Royo P?rez <luis.miguel.royo at gmail.com>
>>> Cc: GRASS user list <grass-user at lists.osgeo.org>
>>> Subject: Re: [GRASS-user] Problems with r.viewshed
>>> Message-ID:
>>> <CALFmHhuPb4w+S03JwMEohU0yQaUas+0f65R=
sVaXsFFEOaTALg at mail.gmail.com>
>>> Content-Type: text/plain; charset=UTF-8
>>>
>>> On Thu, Sep 25, 2014 at 10:35 AM, Luis Miguel Royo P?rez
>>> <luis.miguel.royo at gmail.com> wrote:
>>> > Hi everyone,
>>> >
>>> > when I try to run r.viewshed the output shows me this:
>>>
>>> (in GRASS 6 it is an Addon)
>>>
>>> > Nodata value set to -nan
>>> > rows=198, cols=217, total = 42966
>>> > In-memory memory usage is 4298336 B (4 MB), max mem
>>> > allowed=524288000 B(500MB)
>>> > ***** IN_MEMORY MODE *****
>>> > Start sweeping.
>>> > Computing events ...
>>> > Sorting events...
>>> > Terminado.
>>> > Determine visibility...
>>> > r.viewshed: statusstructure.cpp:73: float
>>> > get_vertical_angle(Viewpoint, StatusNode, surface_type,
>>> > int): La declaraci?n `fabs(sn.dist2vp) > 0.001' no se
>>> > cumple.
>>> >
>>> > Anyone has a clue about what it could be happening?
>>> >
>>> > I'm using GRASS 6.4.4 in Xubuntu 14.04.
>>>
>>> I have backported some fixes from GRASS 7 to the addon in GRASS 6.
>>> Please reinstall the addon with g.extension and try again.
>>>
>>> > I think I must say that a few days ago I installed GRASS 7 but I
removed it
>>> > and reinstalled GRASS 6.4.4. Maybe is there any incompatibility?
>>>
>>> No, GRASS 6 and 7 can happily live together.
>>>
>>> Please let us know if the updated Addon runs ok for you.
>>>
>>> Markus
>>>
>>>
>>> ------------------------------
>>>
>>> Message: 4
>>> Date: Thu, 25 Sep 2014 14:11:36 +0200
>>> From: Luis Miguel Royo P?rez <luis.miguel.royo at gmail.com>
>>> To: Markus Neteler <neteler at osgeo.org>
>>> Cc: GRASS user list <grass-user at lists.osgeo.org>
>>> Subject: Re: [GRASS-user] Problems with r.viewshed
>>> Message-ID: <54240678.7060005 at gmail.com>
>>> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>>>
>>> I'm sorry but it didn't work.
>>>
>>> I have reinstalled the addon but it didn't work, reinstalled GRASS 6.4
>>> and neither, then installed GRASS7 again, and appears this message:
>>>
>>> r.viewshed -b input=Portada at inisig output=visPort
>>> coordinates=-3.74034324324,42.5352702703 obs_elev=9 tgt_elev=1.75
>>> max_dist=30000
>>> Computing events...
>>> Computing visibility...
>>> r.viewshed: statusstructure.cpp:73: float
>>> get_vertical_angle(Viewpoint, StatusNode, surface_type,
>>> int): La declaraci?n `fabs(sn.dist2vp) > 0.001' no se
>>> cumple.
>>>
>>>
>>> I will try in another PC.
>>>
>>> Thank you for your time.
>>>
>>> El 25/09/14 a las #4, Markus Neteler escribi?:
>>> > On Thu, Sep 25, 2014 at 10:35 AM, Luis Miguel Royo P?rez
>>> > <luis.miguel.royo at gmail.com> wrote:
>>> >> Hi everyone,
>>> >>
>>> >> when I try to run r.viewshed the output shows me this:
>>> > (in GRASS 6 it is an Addon)
>>> >
>>> >> Nodata value set to -nan
>>> >> rows=198, cols=217, total = 42966
>>> >> In-memory memory usage is 4298336 B (4 MB), max mem
>>> >> allowed=524288000 B(500MB)
>>> >> ***** IN_MEMORY MODE *****
>>> >> Start sweeping.
>>> >> Computing events ...
>>> >> Sorting events...
>>> >> Terminado.
>>> >> Determine visibility...
>>> >> r.viewshed: statusstructure.cpp:73: float
>>> >> get_vertical_angle(Viewpoint, StatusNode, surface_type,
>>> >> int): La declaraci?n `fabs(sn.dist2vp) > 0.001' no se
>>> >> cumple.
>>> >>
>>> >> Anyone has a clue about what it could be happening?
>>> >>
>>> >> I'm using GRASS 6.4.4 in Xubuntu 14.04.
>>> > I have backported some fixes from GRASS 7 to the addon in GRASS 6.
>>> > Please reinstall the addon with g.extension and try again.
>>> >
>>> >> I think I must say that a few days ago I installed GRASS 7 but I
removed it
>>> >> and reinstalled GRASS 6.4.4. Maybe is there any incompatibility?
>>> > No, GRASS 6 and 7 can happily live together.
>>> >
>>> > Please let us know if the updated Addon runs ok for you.
>>> >
>>> > Markus
>>>
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>>
>>
>>
>>
>> --
>> Pedro Palheiro
>
>
>
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