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

[maven apache]

2010/1/21 Milton Cezar Ribeiro <miltinho.astronauta at gmail.com>

> 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 ?
>
Oh ,thanks ,my mistake.
I used the " r.null map=aaa at PERMANENT setnull=-1.267e+30--1.268e+30 "
it seems that it works. And now I am using the r.fillnulls to do the
Interpolation, it has taken a long time. :(

IS the tension and smooth parameter shoudle be configed?

>
> 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?
>>
>> _______________________________________________
>> grass-user mailing list
>> grass-user at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/grass-user
>>
>>
>
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