[GRASS-user] [r.resample] null values for min and max range of data values

[baobazz]

Hello,

Let me introduce myself: I'm french and new to the GRASS Universe
I'm really amazed by all its possibilities and hope I will have the
knowledge take the most of them..

I've got some problems with resampling an image.

Initially, I wanted to vectorize an image
After having imported it, I tried to thin it through the r.thin command.
But the image produced being too big, it caused errors on my computer.
To solve my problem, I decided to reduce my location resolution: res=2, then
that of my raster with r.resample...

The problem is that my resampled raster output is empty.
When typing r.info raster.resampled, I get:
r.info raster.resampled2                                                        

+----------------------------------------------------------------------------+
 | Layer:    raster.resampled             Date: Tue Feb 16 15:10:35 2010   
|
 | Mapset:   PERMANENT                      |
 | Location: RGF93                                                           
|
 | DataBase: D:\GRASS Database                                               
|
 | Title:     ( raster )                                                     
|
 | Timestamp: none                                                           
|

|----------------------------------------------------------------------------|
 |                                                                           
|
 |   Type of Map:  raster               Number of Categories: 0              
|
 |   Data Type:    CELL                                                      
|
 |   Rows:         500                                                       
|
 |   Columns:      500                                                       
|
 |   Total Cells:  250000                                                    
|
 |        Projection: Lambert Conformal Conic                                
|
 |            N:    6133000    S:    6132000   Res:     2                    
|
 |            E:    1235000    W:    1234000   Res:     2                    
|
 |   Range of data:    min = NULL  max = NULL                                
|
 |                                                                           
|
 |   Data Description:                                                       
|
 |    generated by r.in.gdal                                                 
|
 |                                                                           
|
 |   Comments:                                                               
|
 |    r.in.gdal input="C:/tests/GRASS/rasterToVect/BDP_08_1234_6134_010_L9\  
|
 |    3.tif" output="raster"                                                 
|
 |                                                                           
|

+----------------------------------------------------------------------------+
(Mon Feb 22 14:28:09 2010) Command finished (0 sec)        

What is strange is the null range of data...

The r.info for my raster input, not resampled is:
r.info raster6133_2                                                            

+----------------------------------------------------------------------------+
 | Layer:    raster6133_2                   Date: Fri Feb 19 16:35:13 2010   
|
 | Mapset:   PERMANENT                      |
 | Location: RGF93                                                           
|
 | DataBase: D:\GRASS Database                                               
|
 | Title:     ( raster6133_2 )                                               
|
 | Timestamp: none                                                           
|

|----------------------------------------------------------------------------|
 |                                                                           
|
 |   Type of Map:  raster               Number of Categories: 1              
|
 |   Data Type:    CELL                                                      
|
 |   Rows:         10000                                                     
|
 |   Columns:      10000                                                     
|
 |   Total Cells:  100000000                                                 
|
 |        Projection: Lambert Conformal Conic                                
|
 |            N:    6133000    S:    6132000   Res:   0.1                    
|
 |            E:    1235000    W:    1234000   Res:   0.1                    
|
 |   Range of data:    min = 0  max = 1                                      
|
 |                                                                           
|
 |   Data Description:                                                       
|
 |    generated by r.in.gdal                                                 
|
 |                                                                           
|
 |   Comments:                                                               
|
 |    r.in.gdal input="C:/tests/vectorisation/BDParcellaire/BDP_08_1234_61\  
|
 |    33_010_L93.tif" output="raster6133_2"                                  
|
 |                                                                           
|

+----------------------------------------------------------------------------+

Why is the range of data null?
How to solve that problem?

Thanks in advance!

Mat' 
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