[GRASS-user] change the cell value of a geotiff

[Milton Cezar Ribeiro]

Hi Maven,

do you think that if you have min = -1267650600228229401496703205376.000000
is the same value you used on  r.null setnull=-1.26765060022823e+030 ?

I think following the Hamish's suggestion you will get there :-)

bests

milton



2010/1/20 maven apache <apachemaven0 at gmail.com>

>
>
> 2010/1/21 Hamish <hamish_b at yahoo.com>
>
>   maven apache wrote:
>> > I have a geotiff now, and some cells have a not-expected
>> > value, so I want to Interpolation them, and I notice that
>> > there is a command named r.fillnull, however the cell to be
>> > changed is not null, so I want to :
>> > 1) change the special  cell value to null
>> >
>> > 2) use the r.fillnull to Interpolation.
>> >
>> > The problem is I do not know how to do the step 1 with
>> > grass, anyone can do me a favor?
>>
>>
>> try r.null.
>>
>>
>> Hamish
>>
>>
>>
>> Hi;
> It seems that the r.null does not work.
>
> 1) I use the r.info to get the info of the tiff which I have imported to
> grass and I got that:
> Hi:
>
> (Thu Jan 21 09:56:46
> 2010)
> r.info map=aaa at PERMANENT
>
>
>  +----------------------------------------------------------------------------+
>  | Layer:    aaa at PERMANENT                  Date: Tue Jan 12 16:02:39
> 2010    |
>  | Mapset:   PERMANENT                      Login of Creator:
> Administrator   |
>  | Location:
> hdf5loc                                                          |
>  | DataBase:
> D:\GrassDataBase                                                 |
>  | Title:     ( aaa
> )                                                         |
>  | Timestamp:
> none                                                            |
>
>  |----------------------------------------------------------------------------|
>  |
> |
>  |   Type of Map:  raster               Number of Categories:
> 499             |
>  |   Data Type:
> FCELL                                                      |
>  |   Rows:
> 720                                                        |
>  |   Columns:
> 1440                                                       |
>  |   Total Cells:
> 1036800                                                    |
>  |        Projection:
> Latitude-Longitude                                      |
>  |            N:        90N    S:        90S   Res:
> 0:15                     |
>  |            E:       180E    W:       180W   Res:
> 0:15                     |
>  |   Range of data:    min = -1267650600228229401496703205376.000000  max =
> 4 |
>  |
> |
>  |   Data
> Description:                                                        |
>  |    generated by
> r.in.gdal                                                  |
>  |
> |
>  |
> Comments:                                                                |
>  |    r.in.gdal input="D:\data\hdf5\aaa.tif"
> output="aaa"                     |
>  |
> |
>
>  +----------------------------------------------------------------------------+
> (Thu Jan 21 09:56:47 2010) Command finished (0
> sec)
> (Thu Jan 21 09:56:50 2010)
>
>
> 2)then I use r.null to set the null value to null:   r.null
> setnull=-1.26765060022823e+030
>
>
> 3) I use the r.info again to see if it is changed :
> r.info -r map=aaa at PERMANENT
>
> min=-1.26765060022823e+030
> max=498.5
> (Thu Jan 21 09:56:50 2010) Command finished (0
> sec)
>
> It seems that the valuse are  not changed to null.
>
> I wonder why?
>
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>
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