[GRASS-dev] r.los on windows question

GRASS GRASS developer
1

+1

r.viewshed would be the far better alternative.
Are there any indications as to what causes the
problems with r.viewshed output?

Ben

----- Original Message -----
From: "Markus Neteler" <neteler@osgeo.org>
To: "hamish b" <hamish_b@yahoo.com>
Cc: "developers grass" <grass-dev@lists.osgeo.org>, "Benjamin Ducke" <benjamin.ducke@oxfordarch.co.uk>
Sent: Sunday, March 1, 2009 9:35:31 AM GMT +00:00 GMT Britain, Ireland, Portugal
Subject: Re: [GRASS-dev] r.los on windows question

On Sun, Mar 1, 2009 at 3:22 AM, Hamish <hamish_b@yahoo.com> wrote:
...

also if anyone is interested r.viewshed from wiki addons only needs some
cleanup and small bug fixes to have a LOS app which scales a lot better.

Given the extreme speed improvement of r.viewshed from addons
I consider fixing r.los a waste of time.
BUT: there is a precision fix needed in r.viewshed, see:
http://trac.osgeo.org/grass/ticket/390

Markus

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2

On Sun, Mar 1, 2009 at 11:05 AM, Benjamin Ducke
<benjamin.ducke@oxfordarch.co.uk> wrote:

+1

r.viewshed would be the far better alternative.
Are there any indications as to what causes the
problems with r.viewshed output?

I *feel* that somewhere the precision is cut.
I don't know much about C++ so I have no idea
how to verify this.

Markus

3

Markus:

Given the extreme speed improvement of r.viewshed from addons
I consider fixing r.los a waste of time.

If it is a trivial fix, and right in front of us, we might as well do it.
It is a small cost to have a working & well tested LOS module in 6.4.0,
even if it is horribly slow.

Hamish