Wed, Apr 27 2005
00:57:51
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Request created by jidanni@jidanni.org
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v.net.iso: some roads cost, others distance: sorry
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Dan Jacobson <jidanni@jidanni.org>
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Wed, 27 Apr 2005 05:00:27 +0800
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<873btd6yok.fsf@jidanni.org>
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v.net.iso afcolumn=cost allows us to use a cost instead of a distance
for segments.
OK, what if on some of my roads I want to use cost, and some I want to
use distance?
Surprise surprise, nope. It's either all cost, all distance, or close
the road with -1.
Forget about DELETE FROM table WHERE cat =
road_I_want_measured_by_distance, v.net.iso will go nuts.
OK, then what are you going to set its value to in the table, -1? 0?
-1 is for closed roads. 0 is for 0 cost roads.
Nope. "The software engineers never considered this possibility."!!!
The solution for now would be: if the row is not found in the table,
then measure distance. Better would be -2: use distance.
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Wed, Apr 27 2005
08:55:43
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Mail sent by blazek@itc.it
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Wed, 27 Apr 2005 08:55:39 +0200
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Radim Blazek <blazek@itc.it>
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grass5@grass.itc.it
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Re: [GRASS5] [bug #3188] (grass) v.net.iso: some roads cost, others distance: sorry
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<20050426225751.838AE101EE9@lists.intevation.de>
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Just for others, so that they don't get wrong impression.
If you need to use costs you can calculate them in the database (use
postgres). In this special case something like:
v.to.db option=length
echo "update my set cost = length where costs is null" | db.execute.
Radim
Request Tracker wrote:
> this bug's URL: http://intevation.de/rt/webrt?serial_num=3188
> -------------------------------------------------------------------------
>
> v.net.iso afcolumn=cost allows us to use a cost instead of a distance
> for segments.
>
> OK, what if on some of my roads I want to use cost, and some I want to
> use distance?
>
> Surprise surprise, nope. It's either all cost, all distance, or close
> the road with -1.
>
> Forget about DELETE FROM table WHERE cat =
> road_I_want_measured_by_distance, v.net.iso will go nuts.
>
> OK, then what are you going to set its value to in the table, -1? 0?
> -1 is for closed roads. 0 is for 0 cost roads.
>
> Nope. "The software engineers never considered this possibility."!!!
>
> The solution for now would be: if the row is not found in the table,
> then measure distance. Better would be -2: use distance.
>
>
> --- Headers Follow ---
>
>>From jidanni@jidanni.org Wed Apr 27 00:57:51 2005
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> To: GRASSLIST@baylor.edu
> Cc: grass-bugs@intevation.de
> Subject: v.net.iso: some roads cost, others distance: sorry
> From: Dan Jacobson <jidanni@jidanni.org>
> Date: Wed, 27 Apr 2005 05:00:27 +0800
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Thu, May 5 2005
00:14:16
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Radim Blazek via RT <grass-bugs@intevation.de>
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Re: [bug #3188] (grass) v.net.iso: some roads cost, others
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References |
<20050427065544.07FF11006B0@lists.intevation.de>
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From |
Dan Jacobson <jidanni@jidanni.org>
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Date |
Wed, 04 May 2005 12:22:22 +0800
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H> Just for others, so that they don't get wrong impression.
Mention it on the man page, and then nobody will get the wrong impression.
H> If you need to use costs you can calculate them in the database (use
H> postgres). In this special case something like:
postgres? why not use a dbf example so we don't have to delay the
project to learn postgres.
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Sat, Aug 20 2005
12:51:16
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Area changed to grass6.1 by msieczka
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Wed, Aug 31 2005
20:51:11
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Area changed to grass6 by mneteler
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