Mon, Feb 14 2005
05:58:53
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Request created by guest
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Subject: v.surf.rst wrong quant
Platform: GNU/Linux/i386
grass obtained from: CVS
grass binary for platform: Compiled from Sources
The quant result from query of elevation data computed by v.surf.rst (and s.surf.rst)
is not correct
testquant4 in cent, quant (326)
testquant4 in cent, actual (327.380127)
(should be 327)
The problem may be in
lib/rst/interp_float/output2d.c
G_quantize_fp_map_range (params->elev, mapset,
(DCELL) zminac - 0.5, (DCELL) zmaxac + 0.5,
(CELL) (zminac - 0.5), (CELL) (zmaxac + 0.5));
This bug might have been there for years. Other parameters
are quantized correctly.
Helena
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Mon, Jul 25 2005
11:51:01
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Mail sent by msieczka
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Helena,
Could you please explain how serious this bug is? I mean what problems it may
cause with v.surf.rst in Grass 6.1 for users.
Best
Maciek |
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Wed, Jul 27 2005
18:27:01
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Mail sent by hmitaso@unity.ncsu.edu
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Date |
Wed, 27 Jul 2005 12:26:55 -0400
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From |
Helena Mitasova <hmitaso@unity.ncsu.edu>
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To |
Maciek Sieczka via RT <grass-bugs@intevation.de>
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Subject |
Re: [bug #2986] (grass) v.surf.rst wrong quant
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Maciek Sieczka via RT wrote:
> Helena,
>
> Could you please explain how serious this bug is? I mean what problems it may
> cause with v.surf.rst in Grass 6.1 for users.
>
> Best
> Maciek
>
> -------------------------------------------- Managed by Request Tracker
Not serious - nobody should be using the quant values for anything,
but the person who has reported this to me actually mistakenly tried to
use those values and found the problem.
We (Markus, Helena) already tried tried to remove -0.5 and some other
combinations for
calling the quant function, but that did not change anything.
So one has to digg into G_quantize_fp_map_range function, find out
what exactly is the function doing and what pair of DCELL zminac, CELL
zminac would give the correct quantized minimum.
Unfortunatelly I have more pressing things to do right now than solving
this, so it will have to wait until I have more time or somebody else
can figure it out.
So please change its area to 6.0, 6.1 because it is still there
and keep it as low priority
thank you
Helena
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Mon, Aug 1 2005
17:04:01
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Area changed to grass6.1 by mneteler
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Wed, Aug 31 2005
20:47:52
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Area changed to grass6 by mneteler
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