[GRASS-user] can't start from a BARRIER / Wildfire suite

[Margherita Di Leo]

OK solved. I figured out that it was actually a problem in the units i used
in the input maps.



On Tue, Aug 28, 2012 at 2:58 PM, Margherita Di Leo <diregola at gmail.com>wrote:

> Hi All,
>
> I have some troubles running the Wildfire suite in grass. In particular,
> when i run r.spread I get the following error message:
>
> [...]
> WARNING: can't start from a BARRIER at cell (416,305), request ignored
> WARNING: can't start from a BARRIER at cell (417,305), request ignored
> WARNING: can't start from a BARRIER at cell (418,305), request ignored
> [...]
>
> I checked the input and this is due to the fact that r.ros produces a
> r.ros.base map which is all 0 and null.
>
> r.info map=r_ros0.base
>
>  +----------------------------------------------------------------------------+
>  | Layer:    r_ros0.base                    Date: Tue Aug 28 13:58:37 2012
>    |
>  | Mapset:   PERMANENT                      Login of Creator: leomarg
>     |
>  | Location: Europe
>     |
>  | DataBase: /home/leomarg/grassdata
>    |
>  | Title:     ( r_ros0.base )
>     |
>  | Timestamp: none
>    |
>
>  |----------------------------------------------------------------------------|
>  |
>    |
>  |   Type of Map:  raster               Number of Categories: 0
>     |
>  |   Data Type:    CELL
>     |
>  |   Rows:         744
>    |
>  |   Columns:      889
>    |
>  |   Total Cells:  661416
>     |
>  |        Projection: Lambert Azimuthal Equal Area
>    |
>  |            N:    1903000    S:    1828600   Res:   100
>     |
>  |            E:    3433100    W:    3344200   Res:   100
>     |
>  |   Range of data:    min = 0  max = 0
>     |
>  |
>    |
>  |   Data Description:
>    |
>  |    generated by r.ros
>    |
>  |
>    |
>  |
>    |
>
>  +----------------------------------------------------------------------------+
>
> So I checked the input of r.ros but i'm puzzled because everything looks
> good to me, I can't see any obvious error. In the manual I read:
>
> 3. The output units for the base and maximum ROSes are in cm/minute rather
> than ft/minute, which is due to that a possible zero ft/minute base ROS
> value and a positive integer ft/minute maximum ROS would result in
> calculation failure in the r.spread program.
>
> So if I understand correctly, this can be due to a possible unit mismatch.
> I give the velocity of wind in feet/minute and the direction in degrees, as
> required by the manual.
> Where am I wrong?
>
> Thanks.
>
> madi
>
>
>
> --
> Dr. Margherita Di Leo
>



-- 
Margherita Di Leo
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