[Dhsvm-users] Re: project_mask

[Keith Norman Adams]

Dear Hart & Sujan,

I think the method of creating the mask as outlined by Hart could lead 
to problems when running the model.
The headwater contributing areas (determined in 
'createstreamnetwork.aml') might include cells outside the watershed 
boundary (as determined from a topo map), and cause an imbalance in 
water input and output.

There is something about this in the User Group archives.

I think it is safer to use the ArcInfo GRID commands, as in 
'createstreamnetwork.aml':
grid
setwindow %elev%
setcell %elev%
flowdir = flowdirection(%elev%)
	[leaving out here the check for sinks]
wshd = watershed (flowdir,%wshed%)

***

where:	%elev% is the name of your DEM
	%wshed% is the name of the watershed mouth grid (the grid which has one 
cell at the watershed outlet with value equal to the DEM elevation at 
that cell, and all other cells with value NODATA)


Regards,
Keith Adams.



HART JEK wrote:

> Sujan,
>  
> As you wish to know about mask file. In fact the mask file hides all 
> those areas which lie outside wateshed boudry. These pixels are not 
> processed in futther simulation.
> To prepare the mask file you have to take the following  steps:
> 1- Digitize watershed boundry from topographic map,
> 2-Clip the DEM with this polygon coverage in arcinfo, this would assign 
> nodara values -9999 to all pixels lying  ourside the watershed boundary,
> 3- Convert the Mask grid to ascii format by using grid ascii utility.
> 4-Replace -9999 to 0.
> 5-remove six line header and convert the file to bin files.
>  
>  
>  
> 
> */sujan koirala <sujan_koirala at hotmail.com>/* wrote:
> 
> 
>     hi
>     how have u been?
>     so far i have completed the tutorial and i got the output.but its
>     different
>     than that in website.
>     if u need that file i can mail it to you
>     thank u
> 
>      >From: Julia Lindeman
>      >Reply-To: User Support list for DHSVM Model
>      >To: dhsvm-users at u.washington.edu
>      >Subject: [Dhsvm-users] Re: project_mask
>      >Date: Wed, 14 Sep 2005 09:13:44 -0600 (MDT)
>      >
>      >Sujan,
>      >
>      >I do not seem to have needed a project_mask file. However, all I have
>      >done with the DHSVM so far is the tutorial. Are you working on the
>      >tutorial? If so, at what point in the tutorial are you at?
>      >
>      >Julia
>      >
>      >
>      >
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>     ----------------------------------------------------------------------
>      > >
>      > > Message: 1
>      > > Date: Sun, 11 Sep 2005 08:33:38 +0000
>      > > From: "sujan koirala"
>      > > Subject: [Dhsvm-users] (no subject)
>      > > To: dhsvm-users at u.washington.edu
>      > > Message-ID:
>      > > Content-Type: text/plain; format=flowed
>      > >
>      > > dear users
>      > > i would like to know how the file named project_mask is
>     created. and
>      >what
>      > > is
>      > > the basic input needed to create this file?
>      > > hope u will help me in completing my research..
>      > > thanking u
>      > > sujan
>      > >
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-- 
_______________________________________________ 

  Keith Adams,  Ph.D. Candidate
  School of Geography and Environmental Science,
  The University of Auckland		
  Private Bag  92 019, Auckland, New Zealand
  location:  rm. 438  10 Symonds St.
  email:  k.adams at auckland.ac.nz
  phone:  +64-9-373 7599  ext. 84607
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