Details Ticket 4982


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Serial Number 4982
Subject r.his: the -n flag - leftover or wrong description
Area grass6
Queue grass
Requestors tutey@o2.pl
Owner none
Status open
Last User Contact Wed May 9 22:31:00 2007 (1 yr ago)
Current Priority 30
Final Priority 70
Due No date assigned
Last Action Wed May 9 22:31:00 2007 (1 yr ago)
Created Tue Aug 8 09:05:28 2006 (2 yr ago)

Transaction History Ticket 4982


Tue, Aug 8 2006 09:05:28    Request created by guest  
Subject: r.his: the -n flag - leftover or wrong description

Platform: GNU/Linux/x86
grass obtained from: CVS
grass binary for platform: Compiled from Sources
GRASS Version: 2006.08.02

r.his has an -n option for "Respect NULL values while drawing". It refers to
*drawing* while r.his doesn't draw but creates rasters.

d.his has an identical flag, maybe this is some sort of an leftover (as r.his
is based on d.his)?

Maciek
Wed, May 9 2007 19:30:06    Mail sent by mneteler  
Please fix directly in CVS.

thanks
Markus
Wed, May 9 2007 21:42:28    Mail sent by msieczka  
mneteler wrote (Wed, May 9 2007 19:30:06):

> Please fix directly in CVS.

I'm not even sure if this is a bug or else. I'm asking a question in this ticket.
Asking the author directly this time.

Thanks,
Maciek
Wed, May 9 2007 22:31:00    Mail sent by glynn@gclements.plus.com  
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From Glynn Clements <glynn@gclements.plus.com>
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Date Wed, 9 May 2007 21:30:57 +0100
To Maciek Sieczka via RT <grass-bugs@intevation.de>
Cc grass-dev@grass.itc.it
Subject Re: [GRASS-dev] [bug #4982] (grass) r.his: the -n flag - leftover or wrong description
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Maciek Sieczka via RT wrote:

> > Please fix directly in CVS.
> 
> I'm not even sure if this is a bug or else. I'm asking a question in this ticket.
> 
> Asking the author directly this time.

The reference to "drawing" is incorrect, but the flag has essentially
the same meaning as in d.his.

In d.his:

With -n, a null cell in any input map results in a transparent pixel. 
Without -n, null cells have their associated colour used, as with any
other value.

In r.his:

With -n, a null cell in any input map results in null cells in all
output maps.
Without -n, null cells have their associated colour used, as with any
other value.

IOW:
	r.his    + d.rgb -o => d.his
	r.his -n + d.rgb -o => d.his -n

-- 
Glynn Clements <glynn@gclements.plus.com>


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